SC0440 Truck Cabin Heater May Catch Fire – 2019-2023 Mack LRBE

SEOCONTENT-START

Release Date Number Release Page 03.2023 SC0440 02 1(3)
Torque specifications updated in Impact EV Vehicle Heater Thermal Escalation
LRE
RECALL INFORMATION
Revised (March 31, 2023)
Mack Trucks has determined that certain 2019-2023 model year LRE vehicles, have the risk of an Energy Storage System (ESS), Electric Heater Relays staying energized. On affected vehicles if the ESS Heater Relays stay energized(latched) when in a no flow, or low coolant level condition, this could result in the coolant heater experiencing a thermal escalation posing the risk of property damage and/or personal injury.
Mack Trucks has not received any complaints or reports of vehicle crashes because of this safety issue; therefore, Mack considers this as a proactive measure to protect the public and Mack’s customers from the potential risk associated with this defect.
To ensure that these vehicles meet Mack’s stringent quality requirements, follow the instructions outlined below to replace the ESS electric heater relays, run an accessory kit that enables relays count monitoring, and program the specific control units.
VEHICLES AFFECTED
Certain Mack LR Battery Electric Vehicles manufactured between September 17, 2018, and September 19, 2022.
VEHICLE QUANTITY
There are 48 vehicles affected by this recall. (43 US, 5 Canada)
SAFETY
RECALL
Mack Trucks Inc.
Greensboro, NC USA
Page 2 of 3
Parts
Part Number Part Description Quantity
20709545
Heater relay
4
Repair Instructions
1. Secure vehicle for service.
2. Follow operation 3119-03-02-11 in Impact for replacement of the ESS Electric Heater Relays.
Important Note!
The functional parameter reset; calibration is not required for this recall (Steps 70-72 in Impact). The relay count parameter value will automatically be set to zero when programming the accessory kit.
Software Install
3. Connect to the vehicle using PTT.
4. Using PTT insure the (IC) instrument cluster has the latest SW installed. If not, program the IC using operation 1700-08-03-39 Under the program tab, to update the programming on both ICs.
Important Note!
If the IC is not at the correct SW level the accessory kit will not complete and a pop-up message will appear.
5. Run operation 1700-22-03-06 in PTT under the program tab, to install the Accessory kit Part number 85165435
6. After the accessory is installed program the DC/DC Control Unit (DCU) using operation 3223-22-03-01 in PTT under the program tab.
7. Clear any DTC
8. Return vehicle to service.
Mack Truck Inc.
Safety Recall Date 03.2023 Page 3 of 3
REIMBURSEMENT
This repair is covered by an authorized Safety Recall. Reimbursement is obtained through the normal claim handling process.
UCHP Reimbursement Claim Type (used only when uploading from the Dealer Business System)
40
Recall Status
Vehicle repaired per instructions
1-Modified per instructions Labor Codes
3119-03-02-11 Relays, Electric Heater ESS, Replacement
1.1
3810-22-03-11 Program Instrument Cluster (if applicable)
0.4
1720-16-09-01 Campaign, General X5
0.5 Causal Part
20709545 Authorization Number
C6650
Note: Dealers are to perform Safety Recalls on all subject vehicles at no charge to the vehicle owner regardless of mileage, age of vehicle or ownership (original purchaser or subsequent purchasers). Whenever vehicles are subject to a Safety Recall are brought to your dealership for service, or taken into your dealership vehicle inventory, it is strongly recommended that every effort be made to perform the recall correction before the vehicle is sold or released to the owner.

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SC0440_OW LTR
March 2023
This Notice applies to your vehicle, see enclosed “Notice of Vehicle Recall”
DEAR MACK TRUCK OWNER: This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act.
Mack Trucks, Inc. has decided that a defect which relates to motor vehicle safety exists in certain 2019 and 2021-2023 Mack LR Electric vehicles manufactured September 17, 2018 through September
19, 2022.
SAFETY DEFECT: On a small number of LR Electric models, a relay for the coolant heater could fail. If this happens, the heater could stay energized when there is no coolant flow or a low coolant level. SAFETY RISK: A coolant heater that stays energized could create the risk of a fire.
PRECAUTIONS YOU CAN TAKE: TIME REQUIRED FOR THE REPAIR:
There are no precautions you can take other than having your vehicle repaired by a Mack Parts and Service Center. The time required to inspect and/or repair your vehicle is approximately 1 hour.
WHAT YOU SHOULD DO:
You should contact the nearest Mack Parts and Service Center and make an appointment. Mack dealer will update the hybrid powertrain control unit and instrument cluster software. The dealer will also install replacement relays. All repairs will be performed free of charge.
You can locate the closest Mack Parts and Service Center by going on line to http://www.macktrucks.com/ and selecting “Dealer & Service Locations” or by calling our toll-free number: 1-800-866-1177.
IMPORTANT SAFETY RECALL
SC0440
TSA RECALL # 23V-024 NOTICE REGARDING LEASED VEHICLES:
If you are a Lessor of vehicles subject to this Notice, you have an obligation under Federal Law to provide a copy of this Notice to all Lessees within 10 days of your receipt of this Notice. Further, you must maintain a record, which identifies the Lessee(s) to whom you send a copy of this letter, the date you send this letter, and the Vehicle Identification Number(s) of the vehicle(s) that you have leased to that lessee. For purposes of this Notice, the term Lessor means: a person or entity that is the owner, as reflected on the vehicle’s title, of any five or more leased vehicles (as defined in CFR Section 577.4), as of the date of notification by the manufacturer of the existence of a safety- related defect or non-compliance with a Federal Motor Vehicle Safety Standard in one or more of the leased motor vehicles. OWNER RECALL RESPONSE CARD: The enclosed “Notice of Vehicle Recall” identifies your vehicle. If you no longer own the vehicle, please help us update our records by completing the “Vehicle Disposition Record” portion of the enclosed postage-free Notice of Mandatory Safety Campaign card and mailing it back to us.
ASSISTANCE/ COMPLAINTS:
PRE NOTIFICATION REMEDIES:
If your vehicle has not been repaired within a reasonable time after delivering it to a Mack Parts and Service Center, please contact:
Mack Trucks, Inc.
Regulatory Affairs Department,
P.O. Box 26115
Greensboro, NC 27402-6115
vtna.regulatoryaffairs@volvo.com
You may also submit complaints to the Administrator of the National Highway Traffic Safety Administration (1200 New Jersey Avenue, S.E., Washington DC 20590 or call the toll-free Auto Safety Hot Line at 1-888- 327-4236 (TTY: 1-800-424-9153), or go to http://www.safercar.gov if you believe that Mack has failed to remedy the defect without charge, or has failed to remedy the vehicle within 60 days of the owners first tender to obtain repair following the earliest time that parts are available.
If you have previously paid for repairs as a result of this issue, you may be entitled to recovery of those expenses.
Submit copies of all documentation supporting your claim according to the rules specified in the “General Plan for Reimbursement of Pre- notification Remedies” provided in this mailing.
We regret any inconvenience this may cause to your operation, but hope you will appreciate our sincere efforts to demonstrate Mack’s commitment to provide our customers with the best possible product.
MACK TRUCKS, INC.

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MACK TRUCKS
RECALL ALERT
© Mack Trucks, Inc. CONFIDENTIAL – For limited distribution only to circulation list above. This bulletin, and any information herein, is subject to change by Company without
notice. For the most current and accurate information, always refer to Trucks Dealer Portal for the electronic version of this document.
Description
On certain Electric Vehicles, the coolant heater may stay energized when in a no flow or low coolant level condition, which could cause the heater to catch fire.
No such overheating incidents have been reported to us at this time.
Mack will install replacement relays and perform software update.
Model and Model Years Affected
• Certain 2019 and 2021 – 2023 Mack LR Electric vehicles manufactured September 17, 2018 through September 19, 2022.
Vehicle Quantities
• 47 vehicles (44 US, 3 Canada)
Dealer Responsibilities
• The National Traffic and Motor Vehicle Safety Act and Canadian Motor Vehicle Safety Act require dealers to ensure that all new and used vehicles are free of safety defects and comply with all relevant safety standards at the time of delivery to the consumer.
• Dealers should make their personnel aware of the safety recall. In the event that a dealer has a vehicle included in the safety recall in their inventory to be sold, the condition must be corrected before releasing it to a customer.
Notification Release Schedule
• Vehicle list will be posted on the Trucks Dealer Portal January 27, 2023.
• Owner notification letters will be released on or before March 19, 2023.
• Repair Instruction will be released once they are available.
Contact
If you have questions or concerns about this recall, contact the Regulatory Affairs Department at vtna.regulatoryaffairs@volvo.com.
Subject:
Safety Recall SC0440, EV Vehicle Heater Thermal Escalation
Recall Number:
SRA-M440
Date:
January 27, 2023
Applicable Markets:
☒U.S. ☒Canada ☐ Export

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OMB Control No.: 2127-0004
Part 573 Safety Recall Report 23V-024
The information contained in this report was submitted pursuant to 49 CFR §573
Manufacturer Name : Submission Date :
Mack Trucks, Inc. FEB 21, 2023 NHTSA Recall No. : 23V-024 Manufacturer Recall No. : SC0440
Manufacturer Information :
Manufacturer Name : Mack Trucks, Inc.
Address : 2100 Mack Boulevard
PO Box M Allentown PA 18105-5000 Company phone : 610-709-2131
Population :
Number of potentially involved : 44 Estimated percentage with defect : 100 %
Vehicle Information : Vehicle 1 : 2019-2023 Mack 2019, 2021-2023 Mack LRBE Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : HYBRID ELECTRIC
Descriptive Information : Vehicle population determined by battery electric trucks which have not received updated software (generation) which removes the risk of thermal escalation
Production Dates : SEP 17, 2018 – SEP 19, 2022 VIN Range 1 : Begin : 1M2LR1GC6KM002416 End : 1M2LRDGC7PM001039 ✔ Not sequential Description of Defect :
Description of the Defect : EV vehicle heater thermal escalation. The coolant heater may stay energized and when in a no flow or low coolant level condition, the heater could catch fire.
FMVSS 1 : NR FMVSS 2 : NR
Description of the Safety Risk : Safety risk is the potential for a fire if a relay fails in the closed position and other conditions are met.
Description of the Cause : If a relay fails in a closed position when the vehicle is energized, key in ignition, and cabin heater on. With no coolant flow or a low coolant level, the heater could catch fire. Identification of Any Warning
that can Occur : There are no known warnings.
Involved Components : Part 573 Safety Recall Report 23V-024 Page 2 Component Name 1 : Volvo Systems Engineering Component Description : NA
Component Part Number : NA Supplier Identification : Component Manufacturer
Name : Mack Address : NR
NR
Country : NR Chronology :
June 24, 2021, Volvo Europe Product Safety Committee (PSC) meets and makes a recall decision relative to their EMOB platform. August 18, 2021, Volvo North America is informed of the decision. October 26, 2021 Volvo North America Product Safety Working Group (PSWG) is made aware and opens investigation (21-095) into findings made by Europe PSC and recommends a foreign recall report be filed because the relay in question is used in North American product. November 17, 2021 Volvo North America Foreign Recall Report 21F252 EV vehicle heater thermal escalation. December 16, 2022, PSWG Investigation findings concluded.
January 5, 2023 Investigation findings reviewed with product engineering and verified. January 13, 2023 PSWG makes recommendation that a safety defect finding be made. January 18, 2023, North American PSC meets and makes the determination that a product safety defect exists. January 23, 2023 573 Report Filed with NHTSA. There have been no accidents or injuries or field complaints or warranty claims related to this issue. Description of Remedy :
Description of Remedy Program : Update software for Hybrid Powertrain Control Unit (HPCU) and
Instrument Cluster (IC). Install replacement relays. Reimbursement for the recall will be covered by Manufacturer’s Reimbursement Plan on file with NHTSA. How Remedy Component Differs from Recalled Component : Identify How/When Recall Condition was Corrected in Production : Software installs counter for relay actuations and when a proscribed number of actuations is attained then will flag the vehicle for maintenance, if the actuation numbers are exceeded then the heater itself is disabled.
Updated software to be introduced, all impacted vehicles under our control under a stop shipment The information contained in this report was submitted pursuant to 49 CFR §573 Part 573 Safety Recall Report 23V-024
Page 3
The information contained in this report was submitted pursuant to 49 CFR §573
Recall Schedule :
Description of Recall Schedule : The dealers were notified of the recall 1/27/2023. The notification by
first class mail of the owners will occur no later than 3/19/2023.
Planned Dealer Notification Date : JAN 27, 2023 – JAN 27, 2023
Planned Owner Notification Date : MAR 19, 2023 – MAR 19, 2023
* NR – Not Reported

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OMB Control No.: 2127-0004
Part 573 Safety Recall Report 23V-024
The information contained in this report was submitted pursuant to 49 CFR §573
Manufacturer Name : Submission Date :
Mack Trucks, Inc. APR 26, 2023 NHTSA Recall No. : 23V-024 Manufacturer Recall No. : SC0440
Manufacturer Information :
Manufacturer Name : Mack Trucks, Inc.
Address : 2100 Mack Boulevard
PO Box M Allentown PA 18105-5000 Company phone : 610-709-2131
Population :
Number of potentially involved : 43 Estimated percentage with defect : 100 %
Vehicle Information : Vehicle 1 : 2019-2023 Mack 2019, 2021-2023 Mack LRBE Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : HYBRID ELECTRIC
Descriptive Information : Vehicle population determined by battery electric trucks which have not received updated software (generation) which removes the risk of thermal escalation
Production Dates : SEP 17, 2018 – SEP 19, 2022 VIN Range 1 : Begin : 1M2LR1GC6KM002416 End : 1M2LRDGC7PM001039 ✔ Not sequential Description of Defect :
Description of the Defect : EV vehicle heater thermal escalation. The coolant heater may stay energized and when in a no flow or low coolant level condition, the heater could catch fire.
FMVSS 1 : NR FMVSS 2 : NR
Description of the Safety Risk : Safety risk is the potential for a fire if a relay fails in the closed position and other conditions are met.
Description of the Cause : If a relay fails in a closed position when the vehicle is energized, key in ignition, and cabin heater on. With no coolant flow or a low coolant level, the heater could catch fire. Identification of Any Warning
that can Occur : There are no known warnings.
Involved Components : Part 573 Safety Recall Report 23V-024 Page 2 Component Name 1 : Relay
Component Description : HOR 150 Bridge Make 24V Component Part Number : 20709545 Supplier Identification : Component Manufacturer
Name : Mack Address : NR
NR
Country : NR Chronology :
June 24, 2021, Volvo Europe Product Safety Committee (PSC) meets and makes a recall decision relative to their EMOB platform. August 18, 2021, Volvo North America is informed of the decision. October 26, 2021 Volvo North America Product Safety Working Group (PSWG) is made aware and opens investigation (21-095) into findings made by Europe PSC and recommends a foreign recall report be filed because the relay in question is used in North American product. November 17, 2021 Volvo North America Foreign Recall Report 21F252 EV vehicle heater thermal escalation. December 16, 2022, PSWG Investigation findings concluded.
January 5, 2023 Investigation findings reviewed with product engineering and verified. January 13, 2023 PSWG makes recommendation that a safety defect finding be made. January 18, 2023, North American PSC meets and makes the determination that a product safety defect exists. January 23, 2023 573 Report Filed with NHTSA. There have been no accidents or injuries or field complaints or warranty claims related to this issue. Description of Remedy :
Description of Remedy Program : Update software for Hybrid Powertrain Control Unit (HPCU) and
Instrument Cluster (IC). Install replacement relays. Reimbursement for the recall will be covered by Manufacturer’s Reimbursement Plan on file with NHTSA. How Remedy Component Differs from Recalled Component : Identify How/When Recall Condition was Corrected in Production : Software installs counter for relay actuations and when a proscribed number of actuations is attained then will flag the vehicle for maintenance, if the actuation numbers are exceeded then the heater itself is disabled.
Updated software to be introduced, all impacted vehicles under our control under a stop shipment The information contained in this report was submitted pursuant to 49 CFR §573 Part 573 Safety Recall Report 23V-024
Page 3
The information contained in this report was submitted pursuant to 49 CFR §573
Recall Schedule :
Description of Recall Schedule : The dealers were notified of the recall 1/27/2023. The notification by
first class mail of the owners will occur no later than 3/19/2023.
Planned Dealer Notification Date : JAN 27, 2023 – JAN 27, 2023
Planned Owner Notification Date : MAR 19, 2023 – MAR 19, 2023
* NR – Not Reported

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OMB Control No.: 2127-0004
Part 573 Safety Recall Report 23V-024
The information contained in this report was submitted pursuant to 49 CFR §573
Manufacturer Name : Submission Date :
Mack Trucks, Inc. JAN 23, 2023 NHTSA Recall No. : 23V-024 Manufacturer Recall No. : SC0440
Manufacturer Information :
Manufacturer Name : Mack Trucks, Inc.
Address : 2100 Mack Boulevard
PO Box M Allentown PA 18105-5000 Company phone : 610-709-2131
Population :
Number of potentially involved : 43 Estimated percentage with defect : 100 %
Vehicle Information : Vehicle 1 : 2019-2023 Mack LRBE
Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : HYBRID ELECTRIC
Descriptive Information : Vehicle population determined by battery electric trucks which have not received updated software (generation) which removes the risk of thermal escalation
Production Dates : SEP 17, 2018 – SEP 19, 2022 VIN Range 1 : Begin : 1M2LR1GC6KM002416 End : 1M2LRDGC7PM001039 ✔ Not sequential Description of Defect :
Description of the Defect : EV vehicle heater thermal escalation. The coolant heater may stay energized and when in a no flow or low coolant level condition, the heater could catch fire.
FMVSS 1 : NR FMVSS 2 : NR
Description of the Safety Risk : Safety risk is the potential for a fire if a relay fails in the closed position and other conditions are met.
Description of the Cause : If a relay fails in a closed position when the vehicle is energized, key in ignition, and cabin heater on. With no coolant flow or a low coolant level, the heater could catch fire. Identification of Any Warning
that can Occur : There are no known warnings.
Involved Components : Part 573 Safety Recall Report 23V-024 Page 2 Component Name 1 : Volvo Systems Engineering Component Description : NA
Component Part Number : NA Supplier Identification : Component Manufacturer
Name : Mack Address : NR
NR
Country : NR Chronology :
June 24, 2021, Volvo Europe Product Safety Committee (PSC) meets and makes a recall decision relative to their EMOB platform. August 18, 2021, Volvo North America is informed of the decision. October 26, 2021 Volvo North America Product Safety Working Group (PSWG) is made aware and opens investigation (21-095) into findings made by Europe PSC and recommends a foreign recall report be filed because the relay in question is used in North American product. November 17, 2021 Volvo North America Foreign Recall Report 21F252 EV vehicle heater thermal escalation. December 16, 2022, PSWG Investigation findings concluded.
January 5, 2023 Investigation findings reviewed with product engineering and verified. January 13, 2023 PSWG makes recommendation that a safety defect finding be made. January 18, 2023, North American PSC meets and makes the determination that a product safety defect exists. January 23, 2023 573 Report Filed with NHTSA. There have been no accidents or injuries or field complaints or warranty claims related to this issue. Description of Remedy :
Description of Remedy Program : Update software for Hybrid Powertrain Control Unit (HPCU) and
Instrument Cluster (IC). Install replacement relays. Reimbursement for the recall will be covered by Manufacturer’s Reimbursement Plan on file with NHTSA. How Remedy Component Differs from Recalled Component : Identify How/When Recall Condition was Corrected in Production : Software installs counter for relay actuations and when a proscribed number of actuations is attained then will flag the vehicle for maintenance, if the actuation numbers are exceeded then the heater itself is disabled.
Updated software to be introduced, all impacted vehicles under our control under a stop shipment The information contained in this report was submitted pursuant to 49 CFR §573 Part 573 Safety Recall Report 23V-024
Page 3
The information contained in this report was submitted pursuant to 49 CFR §573
Recall Schedule :
Description of Recall Schedule : NR
Planned Dealer Notification Date : JAN 27, 2023 – JAN 27, 2023 Planned Owner Notification Date : MAR 19, 2023 – NR
* NR – Not Reported

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OMB Control No.: 2127-0004
Part 573 Safety Recall Report 23V-024
The information contained in this report was submitted pursuant to 49 CFR §573
Manufacturer Name : Submission Date :
Mack Trucks, Inc. FEB 15, 2023 NHTSA Recall No. : 23V-024 Manufacturer Recall No. : SC0440
Manufacturer Information :
Manufacturer Name : Mack Trucks, Inc.
Address : 2100 Mack Boulevard
PO Box M Allentown PA 18105-5000 Company phone : 610-709-2131
Population :
Number of potentially involved : 44 Estimated percentage with defect : 100 %
Vehicle Information : Vehicle 1 : 2019-2023 Mack 2019, 2021-2023 Mack LRBE Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : HYBRID ELECTRIC
Descriptive Information : Vehicle population determined by battery electric trucks which have not received updated software (generation) which removes the risk of thermal escalation
Production Dates : SEP 17, 2018 – SEP 19, 2022 VIN Range 1 : Begin : 1M2LR1GC6KM002416 End : 1M2LRDGC7PM001039 ✔ Not sequential Description of Defect :
Description of the Defect : EV vehicle heater thermal escalation. The coolant heater may stay energized and when in a no flow or low coolant level condition, the heater could catch fire.
FMVSS 1 : NR FMVSS 2 : NR
Description of the Safety Risk : Safety risk is the potential for a fire if a relay fails in the closed position and other conditions are met.
Description of the Cause : If a relay fails in a closed position when the vehicle is energized, key in ignition, and cabin heater on. With no coolant flow or a low coolant level, the heater could catch fire. Identification of Any Warning
that can Occur : There are no known warnings.
Involved Components : Part 573 Safety Recall Report 23V-024 Page 2 Component Name 1 : Volvo Systems Engineering Component Description : NA
Component Part Number : NA Supplier Identification : Component Manufacturer
Name : Mack Address : NR
NR
Country : NR Chronology :
June 24, 2021, Volvo Europe Product Safety Committee (PSC) meets and makes a recall decision relative to their EMOB platform. August 18, 2021, Volvo North America is informed of the decision. October 26, 2021 Volvo North America Product Safety Working Group (PSWG) is made aware and opens investigation (21-095) into findings made by Europe PSC and recommends a foreign recall report be filed because the relay in question is used in North American product. November 17, 2021 Volvo North America Foreign Recall Report 21F252 EV vehicle heater thermal escalation. December 16, 2022, PSWG Investigation findings concluded.
January 5, 2023 Investigation findings reviewed with product engineering and verified. January 13, 2023 PSWG makes recommendation that a safety defect finding be made. January 18, 2023, North American PSC meets and makes the determination that a product safety defect exists. January 23, 2023 573 Report Filed with NHTSA. There have been no accidents or injuries or field complaints or warranty claims related to this issue. Description of Remedy :
Description of Remedy Program : Update software for Hybrid Powertrain Control Unit (HPCU) and
Instrument Cluster (IC). Install replacement relays. Reimbursement for the recall will be covered by Manufacturer’s Reimbursement Plan on file with NHTSA. How Remedy Component Differs from Recalled Component : Identify How/When Recall Condition was Corrected in Production : Software installs counter for relay actuations and when a proscribed number of actuations is attained then will flag the vehicle for maintenance, if the actuation numbers are exceeded then the heater itself is disabled.
Updated software to be introduced, all impacted vehicles under our control under a stop shipment The information contained in this report was submitted pursuant to 49 CFR §573 Part 573 Safety Recall Report 23V-024
Page 3
The information contained in this report was submitted pursuant to 49 CFR §573
Recall Schedule :
Description of Recall Schedule : NR
Planned Dealer Notification Date : JAN 27, 2023 – JAN 27, 2023 Planned Owner Notification Date : MAR 19, 2023 – NR
* NR – Not Reported

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OMB Control No.: 2127-0004
Part 573 Safety Recall Report 23V-024
The information contained in this report was submitted pursuant to 49 CFR §573
Manufacturer Name : Submission Date :
Mack Trucks, Inc. MAR 10, 2023 NHTSA Recall No. : 23V-024 Manufacturer Recall No. : SC0440
Manufacturer Information :
Manufacturer Name : Mack Trucks, Inc.
Address : 2100 Mack Boulevard
PO Box M Allentown PA 18105-5000 Company phone : 610-709-2131
Population :
Number of potentially involved : 43 Estimated percentage with defect : 100 %
Vehicle Information : Vehicle 1 : 2019-2023 Mack 2019, 2021-2023 Mack LRBE Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : HYBRID ELECTRIC
Descriptive Information : Vehicle population determined by battery electric trucks which have not received updated software (generation) which removes the risk of thermal escalation
Production Dates : SEP 17, 2018 – SEP 19, 2022 VIN Range 1 : Begin : 1M2LR1GC6KM002416 End : 1M2LRDGC7PM001039 ✔ Not sequential Description of Defect :
Description of the Defect : EV vehicle heater thermal escalation. The coolant heater may stay energized and when in a no flow or low coolant level condition, the heater could catch fire.
FMVSS 1 : NR FMVSS 2 : NR
Description of the Safety Risk : Safety risk is the potential for a fire if a relay fails in the closed position and other conditions are met.
Description of the Cause : If a relay fails in a closed position when the vehicle is energized, key in ignition, and cabin heater on. With no coolant flow or a low coolant level, the heater could catch fire. Identification of Any Warning
that can Occur : There are no known warnings.
Involved Components : Part 573 Safety Recall Report 23V-024 Page 2 Component Name 1 : Volvo Systems Engineering Component Description : NA
Component Part Number : NA Supplier Identification : Component Manufacturer
Name : Mack Address : NR
NR
Country : NR Chronology :
June 24, 2021, Volvo Europe Product Safety Committee (PSC) meets and makes a recall decision relative to their EMOB platform. August 18, 2021, Volvo North America is informed of the decision. October 26, 2021 Volvo North America Product Safety Working Group (PSWG) is made aware and opens investigation (21-095) into findings made by Europe PSC and recommends a foreign recall report be filed because the relay in question is used in North American product. November 17, 2021 Volvo North America Foreign Recall Report 21F252 EV vehicle heater thermal escalation. December 16, 2022, PSWG Investigation findings concluded.
January 5, 2023 Investigation findings reviewed with product engineering and verified. January 13, 2023 PSWG makes recommendation that a safety defect finding be made. January 18, 2023, North American PSC meets and makes the determination that a product safety defect exists. January 23, 2023 573 Report Filed with NHTSA. There have been no accidents or injuries or field complaints or warranty claims related to this issue. Description of Remedy :
Description of Remedy Program : Update software for Hybrid Powertrain Control Unit (HPCU) and
Instrument Cluster (IC). Install replacement relays. Reimbursement for the recall will be covered by Manufacturer’s Reimbursement Plan on file with NHTSA. How Remedy Component Differs from Recalled Component : Identify How/When Recall Condition was Corrected in Production : Software installs counter for relay actuations and when a proscribed number of actuations is attained then will flag the vehicle for maintenance, if the actuation numbers are exceeded then the heater itself is disabled.
Updated software to be introduced, all impacted vehicles under our control under a stop shipment The information contained in this report was submitted pursuant to 49 CFR §573 Part 573 Safety Recall Report 23V-024
Page 3
The information contained in this report was submitted pursuant to 49 CFR §573
Recall Schedule :
Description of Recall Schedule : The dealers were notified of the recall 1/27/2023. The notification by
first class mail of the owners will occur no later than 3/19/2023.
Planned Dealer Notification Date : JAN 27, 2023 – JAN 27, 2023
Planned Owner Notification Date : MAR 19, 2023 – MAR 19, 2023
* NR – Not Reported

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OMB Control No.: 2127-0004
Part 573 Safety Recall Report 23V-024
The information contained in this report was submitted pursuant to 49 CFR §573
Manufacturer Name : Submission Date :
Mack Trucks, Inc. FEB 20, 2023 NHTSA Recall No. : 23V-024 Manufacturer Recall No. : SC0440
Manufacturer Information :
Manufacturer Name : Mack Trucks, Inc.
Address : 2100 Mack Boulevard
PO Box M Allentown PA 18105-5000 Company phone : 610-709-2131
Population :
Number of potentially involved : 44 Estimated percentage with defect : 100 %
Vehicle Information : Vehicle 1 : 2019-2023 Mack 2019, 2021-2023 Mack LRBE Vehicle Type : BUSES, MEDIUM & HEAVY VEHICLES Body Style : OTHER Power Train : HYBRID ELECTRIC
Descriptive Information : Vehicle population determined by battery electric trucks which have not received updated software (generation) which removes the risk of thermal escalation
Production Dates : SEP 17, 2018 – SEP 19, 2022 VIN Range 1 : Begin : 1M2LR1GC6KM002416 End : 1M2LRDGC7PM001039 ✔ Not sequential Description of Defect :
Description of the Defect : EV vehicle heater thermal escalation. The coolant heater may stay energized and when in a no flow or low coolant level condition, the heater could catch fire.
FMVSS 1 : NR FMVSS 2 : NR
Description of the Safety Risk : Safety risk is the potential for a fire if a relay fails in the closed position and other conditions are met.
Description of the Cause : If a relay fails in a closed position when the vehicle is energized, key in ignition, and cabin heater on. With no coolant flow or a low coolant level, the heater could catch fire. Identification of Any Warning
that can Occur : There are no known warnings.
Involved Components : Part 573 Safety Recall Report 23V-024 Page 2 Component Name 1 : Volvo Systems Engineering Component Description : NA
Component Part Number : NA Supplier Identification : Component Manufacturer
Name : Mack Address : NR
NR
Country : NR Chronology :
June 24, 2021, Volvo Europe Product Safety Committee (PSC) meets and makes a recall decision relative to their EMOB platform. August 18, 2021, Volvo North America is informed of the decision. October 26, 2021 Volvo North America Product Safety Working Group (PSWG) is made aware and opens investigation (21-095) into findings made by Europe PSC and recommends a foreign recall report be filed because the relay in question is used in North American product. November 17, 2021 Volvo North America Foreign Recall Report 21F252 EV vehicle heater thermal escalation. December 16, 2022, PSWG Investigation findings concluded.
January 5, 2023 Investigation findings reviewed with product engineering and verified. January 13, 2023 PSWG makes recommendation that a safety defect finding be made. January 18, 2023, North American PSC meets and makes the determination that a product safety defect exists. January 23, 2023 573 Report Filed with NHTSA. There have been no accidents or injuries or field complaints or warranty claims related to this issue. Description of Remedy :
Description of Remedy Program : Update software for Hybrid Powertrain Control Unit (HPCU) and
Instrument Cluster (IC). Install replacement relays. Reimbursement for the recall will be covered by Manufacturer’s Reimbursement Plan on file with NHTSA. How Remedy Component Differs from Recalled Component : Identify How/When Recall Condition was Corrected in Production : Software installs counter for relay actuations and when a proscribed number of actuations is attained then will flag the vehicle for maintenance, if the actuation numbers are exceeded then the heater itself is disabled.
Updated software to be introduced, all impacted vehicles under our control under a stop shipment The information contained in this report was submitted pursuant to 49 CFR §573 Part 573 Safety Recall Report 23V-024
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The information contained in this report was submitted pursuant to 49 CFR §573
Recall Schedule :
Description of Recall Schedule : NR
Planned Dealer Notification Date : JAN 27, 2023 – JAN 27, 2023
Planned Owner Notification Date : MAR 19, 2023 – MAR 19, 2023
* NR – Not Reported

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