April 20, 2021 NHTSA CAMPAIGN NUMBER: 21E032000

High Pressure Fuel Rail Assembly May Leak Fuel

A fuel leak in the presence of an ignition source increases the risk of a fire.

NHTSA Campaign Number: 21E032

Manufacturer Cummins, Inc.

Components FUEL SYSTEM, DIESEL

Potential Number of Units Affected 44,956

Summary

Cummins, Inc. (Cummins) is recalling certain L9 part number D0K3003BX03 and ISX12 part number D563025BX03 diesel engines. The sealing washer may not seat correctly in the pilot bore holes, allowing the high pressure fuel rail assembly to leak.

Remedy

Dealers will inspect the rail threads and fuel lines, and replace the rail as necessary, free of charge. Owner letters were mailed July 30, 2021. Owners may contact Cummins customer service at 1-800-286-6467.

Notes

Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.

Technical Service Bulletin

Technical Service Bulletin: TSB210113	Released Date: 30-Jul-2021
Fuel Rail Assembly Inspection and Repair Procedure: External Fuel Leaks

Fuel Rail Assembly Inspection and Repair

Procedure: External Fuel Leaks

Warranty Statement

The information in this document authorizes specific changes to the repair practice for failures covered under product warranty coverages.

Product Affected

ISL CM2150 (Only ReCon® versions)

ISL9 CM2250 (Only ReCon® versions)

ISL9 CM2350 L101 (Only ReCon® versions)

ISL9 CM2350 L111

ISL9 CM2350 L111 (Only ReCon® versions)

ISX12 CM2350 X102

L9 CM2350 L116B

L9 CM2350 L119B

L9 CM2350 L123B

QSL9 CM2350 L107

QSL9 M CM2250 L106

Issue

Symptom:

External Fuel Leak from the pressure relief valve or the high-pressure fuel fitting on the fuel rail.

Root Cause:

The rail end sealing bores in the high-pressure fuel rail may have undersized pilot bores for the sealing washer, thus preventing the washer from properly seating, potentially resulting in inadequate load for the joint to remain properly sealed in service.

Verification

Remove the pressure relief valve and the high-pressure fuel fitting from the fuel rail.

Figure 1, Removing the pressure relief valve and the high pressure fuel fitting.

Remove and discard the sealing washers. The procedure below outlines how to remove the sealing washers.

CAUTION

Special care should be taken to avoid damage to threads during removal process.

A special tool must be created for the removal of the sealing washers by grinding a 45 degree angle on the short leg of a 1/8-inch or 3/16-inch Allen wrench, so that the wrench is no longer than 13 mm [ ½ in ] long (measured from the outside of the long leg.)

This tool acts as a mini heel bar to pry out the sealing washer without damaging the back of the hole.

Use the modified Allen wrench to pry out the old sealing washer from the threaded hole in the fuel rail. Considerable force is required to remove the sealing washer.

Note: If unable to create the tool, contact a local Cummins® Distributor branch for assistance.

Figure 2, Removing Sealing Washer from Fuel Rail.

Visually inspect the thread surfaces of the fuel rail, fuel pressure relief valve and the high-pressure fuel fitting for damage. Review Figures 3 and 4 below for guidance.

Do not reuse components if the threads or sealing surfaces are damaged.

Figure 3, Threads That Do Not Meet Reuse Guidelines.

Figure 4, Left: Not Acceptable For Reuse, Right: Acceptable For Reuse.

Resolution

A new seal installer tool, Part Number 5573487, is now available for this repair.

Figure 5, New Seal Installer Tool, Part Number 5573487.

The new seal installer tool must be available for all repairs requiring the installation of pressure relief valve or the high pressure fuel fitting on the fuel rail. See Service Instructions section below.

CAUTION

Do not perform the repair if the seal installer tool is not available or is damaged as damage to components can result.

Service Instructions

If the threads or sealing surfaces are damaged, replace the fuel rail assembly. See corresponding Service Manual. Reference Procedure 006-060, 006-061 in Section 6 and Technical Service Bulletin, New Fuel Rail, High Pressure Injector Supply Lines, Fuel Supply Line, and Fuel Supply Line Braces, TSB210055 for directions.

If the threads or sealing surfaces are not damaged, install the pressure relief valve and the end fitting with the following procedure:

1. Inspect the seal installer tool for damage on the threads or sealing surfaces. Do not use the seal installer tool if the threads or sealing surfaces are damaged.

Figure 6, Seal Installer Tool Threads Not Acceptable for Use.

2. Install a new sealing washer on the pressure relief valve bore in the fuel rail. Use assembly lubricant, Part Number 3163087, or equivalent, on the threads and the face of the seal installer tool. Use seal installer tool, Part Number 5573487, to seat the sealing washer fully in the fuel rail bore.

3. Torque the seal installer tool.

Torque Value: 81 n•m [ 60 ft-lb ]

Figure 7, Installing Sealing Washer with The Seal Installer Tool.

4. Remove the seal installer tool after the sealing washer has been installed. Verify that the sealing washer remains seated inside the fuel rail after the seal installer tool is removed.

Figure 8, Left: Sealing Washer Not Installed, Right: Sealing Washer Installed Correctly.

5. Inspect the seal installer tool for damage on the threads or sealing surfaces. Do not use the seal installer tool if the threads or sealing surfaces are damaged.

6. Install a new sealing washer on the high-pressure fuel fitting bore in the fuel rail. Use assembly lubricant, Part Number 3163087, or equivalent, on the threads and the face of the seal installer tool. Use seal installer tool, Part Number 5573487, to seat the sealing washer fully in the fuel rail bore.

7. Torque the seal installer tool.

Torque Value: 81 n•m [ 60 ft-lb ]

8. Remove the seal installer tool after the sealing washer has been installed. Verify that the sealing washer remains seated inside the fuel rail after the seal installer tool is removed.

9. If either of the sealing washers do not remain seated inside the fuel rail after the seal installer tool has been removed, use of seal installer tool is not required. Install washer in bore.

10. Install the pressure relief valve and the high-pressure fuel fitting. Use assembly lubricant, Part Number 3163087, or equivalent, on the threads. Tighten the pressure relief valve and the high pressure fuel fitting with the torque plus angle method.

Torque Value: 27 n•m [ 239 in-lb ] Rotate 90 degrees.

11. See corresponding Service Manual. Reference Procedure 006-061 in Section 6 for finishing steps.

Service Parts Availability

Service parts are available. See Table 1 for part numbers.

Table 1, Service Parts
Part Description	Existing Part Number	Obsolete	Superseded	New Part Number
Seal Installer Tool	–	No	No	5573487

Publications Affected

Table 2, Publications Affected

Manual Type

Procedure Title

Procedure

Section

Service Manual

Fuel Pressure Relief

Valve

Procedure 006-061

Document History

Date	Details
2021-5-27	Module Created
2021-6-28	Updated Product Affected section.
2021-7-26	Added ISL9 CM2250, ISL9 CM2350 L101, and ISL9 CM2350 L111 Recon versions to the Product Affected list.
2021-7-29	Added note about creation of tool.

Last Modified: 28-Jun-2021

Warranty Field Campaign

Campaign Number: c2423

Revision:

Released Date: 13-Jul-2021

L9 / ISX12 Fuel Rail Safety Campaign for Select North American On-Highway Applications

Expiration Date (U.S. and Canada): 24-Jun-2051

Expiration Date

(International): 24-Jun2051

Attention

U.S. / Canadian Dealers
U.S. / Canadian Distr./Branches and Div. Offices (Automotive)

If additional information is required, please contact your Cummins Warranty Operations Group Leader.

Description

This Safety Campaign is being issued to address a defect which relates to safety that exists in certain Cummins L9 and ISX12 engines manufactured between January 2, 2017 and October 16, 2020.

The fuel rail assembly may develop leaks, which may result in an undetected prolonged diesel fuel spray. The operator may see or smell diesel fuel and, in some cases, the check engine lamp may illuminate. A leak involving spraying/misting fuel in the presence of an ignition source may increase the risk of fire.

Note : This field action provides retroactive coverage for repairs made in anticipation of and prior to the release of this publication.

Action

In order to qualify for repair under this field action, an engine:

1. will be covered Regardless of coverage status, and

2. must show as OPEN on QuickServe® Online for this field action.

Note : The ESN list is attached for reference.

After verifying that the engine meets the above requirements, perform the following actions:

1. Remove the fuel pressure relief valve and the end fitting from the fuel rail. Refer to Procedure 006-061 in the appropriate service manual for further detail.

2. Remove and discard the sealing washers using the appropriate tool. Refer to TSB210113 and 006-061 in the appropriate service manual.

Note : A special tool must be used when removing the sealing washer to prevent end thread damage upon removal of the washers. Please refer to TSB210113 and 006-061 in the appropriate service manual for instructions to create the sealing washer removal tool. If the repair location is unable to create this tool, please reach out to the local Cummins Distributor branch for assistance.

3. Visually inspect the end thread surfaces of the fuel rail for damage. Refer to TSB210113 for visual examples.

4. Based on inspection results, follow Repair Path A or B as outlined below.

Repair Path A: If no damage to fuel rail end threads exists;

4. A.1. Complete installation of new washers. Refer to TSB210113 and 006-061 in the appropriate service manual.

Note : A new Seal Installer Tool, Part Number 5573487, has been released for use in this repair and MUST be used to install the washers. This tool is not a consumable and can be used to complete multiple repairs. Each Repair Location will be allowed to order up to three of the Seal Installation Tools, PN 5573487, to complete the repairs described by this Campaign. Orders of more then 3 of 5573487 will be cancelled unless ordered per the instructions in PPC# 6043.

4. A.2. Place a paint dot on the fuel rail to indicate that the washer installation has been completed.

4. A.3. File one claim for only the applicable parts, labor, access, and travel or towing listed in this field action.

Repair Path B: If the fuel rail end threads are damaged, see TRP2456 for rail replacement parts and repair instructions.

4. B.1. After completing TRP2456, file two claims:

4. B.1a File one claim to this Campaign #2423 for ONLY the applicable parts, labor, access, and travel or towing listed in this field action. DO NOT include the sealing washers nor the associated labor to remove and install the pressure relief value. Upfits are covered within the work performed to complete TRP2456.

Note : This Campaign #2423 DOES NOT COVER the parts nor the labor associated with the rail replacement work. Please refer to TRP2456 for reimbursements

4. B.1b File one claim to TRP2456 for only the fuel rail parts and labor.

Material Disposition

Where applicable, items removed should be returned to ReCon for core credit. Unless otherwise indicated, items with no core liability can be scrapped.

Reimbursements

Parts

Parts listed are OPTIONAL. They are NOT claimable in the event progressive damage to the fuel rail end threads are found. Upfits will be covered within the work performed to complete TRP2456.

Part Number	Quantity	Description
498438200	2	WSH,SNG (OPTIONAL)

Note : SRTs to gain access that are required to complete the repair, that are sufficiently explained in the claim narrative, may also be claimed on this action.

Note : SRTs listed are OPTIONAL. Select ONLY the appropriate SRTs for the repair performed. SRTs to gain access that are required to complete the repair, that are sufficiently explained in the claim narrative, may also be claimed on this action.

Labor Using Applicable Access Code and Time

SRT Code	Description	Time (hrs)
00-90X	Administrative time
06-09L	Fuel Pressure Relief Valve – Remove and Install – L9 CM2350 L123B (OPTIONAL)
06-0BL	Fuel Pressure Relief Valve – Remove and Install – L9 CM2350 L119B (OPTIONAL)
06-07Y	Fuel Pressure Relief Valve – Remove and Install – L9 CM2350 L116B (OPTIONAL)
06-129	Fuel Pressure Relief Valve – Remove and Install (OPTIONAL)

Travel

Travel is covered under this field action. Towing is covered under this field action.

Note : Please schedule the Technicians time to maximize the number of units that can be repaired on a single visit. When filing claims for multiple ESNs, where travel or towing is required, travel or towing can be filed to ONLY one (1) ESN.

Other Claimables

Consumables are covered under this field action.

Note : Additional parts, such as o-rings, gaskets and fasteners, that are required to complete the repair, but not listed, may be claimed in Other Claimables. Please consolidate all consumables and claim them as one line item in Other Claimables titled CAMPAIGN SUPPLIES or other appropriate selections. Please include brief summaries on the details of items claimed.

Note : As required due to progressive damage to the fuel rail end threads, TRP2456 is available for the replacement of the fuel rail. The TRP covers only the fuel rail parts and required labor. Consumables, travel, towing, or any other costs not outlined in TRP2456 can be claimed against this Safety Campaign. Please consolidate all consumables and claim them as one line in Other Claimables titled “CAMPAIGN SUPPLIES”. Please include brief summaries on the details of items claimed.

Claim Instructions

For Cummins Dealers, claims for this Field Campaign must be filed via RAPIDSERVE™ Web (rsw.cummins.com). For information regarding RAPIDSERVE™ Web, please reference the “Warranty” tab in QuickServe® Online. If there are additional questions, please contact your local Cummins Distributor.

Claim Codes
Description	Code
Account Code:	65
Pay Code:	North America Distributor = X
Pay Code:	North America Dealer = D
Pay Code:	International Distributor = I
Pay Code:	International Dealer = R
Failure Code:	WFLSWA

Attachments

Click here to see c2423_esn-list.xlsx

(/service/english/attachments/c2423_esn-list.xlsx)

Engine Family	Fuel System
ISX11.9
Design Application	Market Application
All	All
All	All
All	All
All	All
All	All
All	All
All	All

Document History

Date	Details
	Document Created; 13-Jul-2021

Last Modified: 13-Jul-2021

Warranty Memo

Number: m2117

Revision:

Released Date: 08-Jul-2021

Interim Notification Regarding Pending Safety Campaigns C2423 and C2425 to address a concern with the fuel rail assembly on certain L9 and ISX12 Engines

Expiration Date (U.S. and Canada): 01-Oct-2021

Expiration Date

(International): 01-Oct2021

Attention

Purpose

The purpose of this memo is to notify repair locations that Cummins Inc. is initiating interim end user notification mailings regarding a safety defect on certain L9 and ISX12 engines.

Discussion

Cummins Inc. has decided that a defect which relates to safety exists in certain L9 and ISX12 engines that were manufactured between January 2, 2017 and October 16, 2020 and installed in bus, school bus, emergency vehicle, recreational vehicle, generator set and marine applications. The fuel rail assembly may develop leaks, which may result in an undetected prolonged diesel fuel spray. A leak in the presence of an ignition source may increase the risk of fire.

Cummins has notified affected Original Equipment Manufacturers to which these engines have been shipped and has filed a Defect Notification with the U.S. National Highway Traffic Safety Administration for applicable engines. NHTSA has assigned this recall number 21E-032.

The Safety Campaigns are expected to be published on QuickServe Online in July, 2021 when the parts, special tooling and repair instructions are expected to be available. Safety Campaign

Number C2423 will apply to on-highway units in the United States and Canada and Safety

Campaign Number C2425 will apply to all other units. Cummins will contact end-user by mail when the Campaigns are published.

Action

Until the Safety Campaigns are available, for affected units that develop a leak, follow the repair identified in TSB210113. For units that are not leaking, distributors and dealers must wait until the appropriate Safety Campaigns are published on QSOL to effect any repairs.

Cummins expects to begin notifying owners on June 18, 2021 with interim letters informing them that the safety defect exists and that they will receive another notice when the repair is available. Cummins is advising customers to periodically check the fuel rail for signs of leaking and seek repairs if leaks are identified. If a leak occurs, the operator may see or smell diesel fuel and, in some cases, the check engine lamp may illuminate. A second notification will be sent to end users to inform them when the final remedy is available and provide instructions to schedule the recall for their engine. The second notifications are expected to mail during July 2021.

Customers and repair locations with questions may contact Cummins Care at 1-800-CUMMINS (1800-286-6467).

Engine Family	Fuel System
All	All
Design Application	Market Application
All	All

Document History

Date	Details
2021-6-17	Document Created
2021-7-08	Update the Discussion

Last Modified: 08-Jul-2021

A CUMMINS FIELD CAMPAIGN

Please Deliver To: Service Managers and Warranty Decision Makers

FROM: Cummins Global Warranty Administration Communications

Subject: L9 / ISX12 Fuel Rail Safety Campaign for Select North American On-Highway Applications

Number: C2423

Date: 07-Sep-2021

Expires: 24-Jun-2051 (U.S./Canada) 24-Jun-2051 (International)

Attention: U.S. / Canadian Dealers

U.S. / Canadian Distr./Branches and Div. Offices (Automotive)

This is to revise and replace C2423, dated 13-Jul-2021. This revision is to:

1 Update narratives, and

2 update SRTs.

If additional information is required, please contact your Cummins Warranty Operations Group Leader.

DESCRIPTION:

This Safety Campaign is being issued to address a defect which relates to safety that exists in certain Cummins L9 and ISX12 engines manufactured between January 2, 2017 and October 16, 2020.

The fuel rail assembly may develop leaks, which may result in an undetected prolonged diesel fuel spray. The operator may see or smell diesel fuel and, in some cases, the check engine lamp may illuminate. A leak involving spraying/ misting fuel in the presence of an ignition source may increase the risk of fire.

NOTE: This field action provides retroactive coverage for repairs made in anticipation of and prior to the release of this publication.

ACTION:

In order to qualify for repair under this field action, an engine:

1 will be covered Regardless of coverage status, and

2 must show as OPEN on QuickServe® Online for this field action.

NOTE: The ESN list is attached for reference.

After verifying that the engine meets the above requirements, perform the following actions:

1. Remove the pressure relief valve and high-pressure fuel fitting to access the sealing washers.

- A. Remove the pressure relief valve from the fuel rail. Refer to Procedure 006-061 in the appropriate service manual for further detail.
- B. Remove the #1 injector supply line from the fuel rail, as well as the high-pressure fuel fitting, from the fuel rail. Refer to Procedure 006-051 in the appropriate service manual for the injector supply line and TSB210113 for additional information on the high-pressure fuel fitting.
NOTE: Only the #1 injector supply line needs to be removed for this repair to access the sealing washer on the left side of the fuel rail. Only Claim 1 count each of the appropriate SRT for Injector Supply Line Remove and Install Each – Additional.

2. Remove and discard the sealing washers using the appropriate tool. Refer to TSB210113.

NOTE: A special tool must be used when removing the sealing washer to prevent end thread damage upon removal of the washers. Please refer to TSB210113 for instructions to create the sealing washer removal tool. If the repair location is unable to create this tool, please reach out to the local Cummins Distributor branch for assistance.

NOTE: There are 2 sealing washers that need to be installed, one located on each end of the rail.

3. Visually inspect the end thread surfaces of the fuel rail for damage. Refer to TSB210113 for visual examples.

4. Based on inspection results, follow Repair Path A or B as outlined below.

Repair Path A: If no damage to fuel rail end threads exists;

4. A.1. Complete installation of new washers. Refer to TSB210113.

NOTE: A new Seal Installer Tool, Part Number 5573487, has been released for use in this repair and MUST be used to install the washers. This tool is not a consumable and can be used to complete multiple repairs. Each Repair Location will be allowed to order up to three of the Seal Installation Tools, PN 5573487, to complete the repairs described by this Campaign. Orders of more then 3 of 5573487 will be cancelled unless ordered per the instructions in PPC# 6043.

4. A.2. Place a paint dot on the fuel rail to indicate that the washer installation has been completed.

4. A.3. File one claim for only the applicable parts, labor, access, and travel or towing listed in this field action.

Repair Path B: If the fuel rail end threads are damaged, see TRP2456 for rail replacement parts and repair instructions.

4. B.1. After completing TRP2456, file two claims:

NOTE: This Campaign #2423 DOES NOT COVER the parts nor the labor associated with the rail replacement work. Please refer to TRP2456 for reimbursements

4. B.1b File one claim to TRP2456 for only the fuel rail parts and labor.

MATERIAL DISPOSITION:

Where applicable, items removed should be returned to ReCon for core credit. Unless otherwise indicated, items with no core liability can be scrapped.

REIMBURSEMENTS:

Parts:

Parts listed are OPTIONAL. They are NOT claimable in the event progressive damage to the fuel rail end threads are found. Upfits will be covered within the work performed to complete TRP2456.

Part Number	Quantity	Description
498438200	2	WSH,SNG (OPTIONAL)

NOTE: SRTs to gain access that are required to complete the repair, that are sufficiently explained in the claim narrative, may also be claimed on this action.

NOTE: SRTs listed are OPTIONAL. Select ONLY the appropriate SRTs for the repair performed.

Labor using applicable Access Code and Time:

SRT Code	Description	Time
00-90X	Administrative time
06-028	Fuel Tube, Injector Supply – Remove and Install, Each Additional (Common Rail Fuel System) (OPTIONAL)
06-07Y	FUEL PRESSURE RELIEF VALVE – REMOVE AND INSTALL – L9 CM2350 L116B (OPTIONAL)
06-085	Injector Supply Lines (High Pressure) – Remove and Install, Each Additional – L9 CM2350 L116B (OPTIONAL)
06-09L	Fuel Pressure Relief Valve – Remove and Install – L9 CM2350 L123B (OPTIONAL)
06-09W	Injector Supply Lines (High Pressure) – Remove and Install, Each Additional – L9 CM2350 L123B (OPTIONAL)
06-0BB	Injector Supply Lines (High Pressure) – Remove and Install, Each Additional – L9 CM2350 L119B (OPTIONAL)
06-0BL	Fuel Pressure Relief Valve – Remove and Install – L9 CM2350 L119B (OPTIONAL)
06-118	Fuel Lines, Injector Supply – Remove and Install – Each (OPTIONAL)
06-129	Fuel Pressure Relief Valve – Remove and Install (OPTIONAL)

Travel:

Travel is covered under this field action. Towing is covered under this field action.

NOTE: Please schedule the Technicians time to maximize the number of units that can be repaired on a single visit. When filing claims for multiple ESNs, where travel or towing is required, travel or towing can be filed to ONLY one (1) ESN.

Other Claimables:

Consumables are covered under this field action.

NOTE: Additional parts, such as o-rings, gaskets and fasteners, that are required to complete the repair, but not listed, may be claimed in Other Claimables. Please consolidate all consumables and claim them as one line item in Other Claimables titled CAMPAIGN SUPPLIES or other appropriate selections. Please include brief summaries on the details of items claimed.

NOTE: As required due to progressive damage to the fuel rail end threads, TRP2456 is available for the replacement of the fuel rail. The TRP covers only the fuel rail parts and required labor. Consumables, travel, towing, or any other costs not outlined in TRP2456 can be claimed against this Safety Campaign. Please consolidate all consumables and claim them as one line in Other Claimables titled “CAMPAIGN SUPPLIES”. Please include brief summaries on the details of items claimed.

Claim Instructions:

Account Code:	65
Pay Code:	North America Distributor = X
Pay Code:	North America Dealer = D
Pay Code:	International Distributor = I
Pay Code:	International Dealer = R
Failure Code:	WFLSWA

Attachments

c2423_esn-list.xlsx

*** IMPORTANT SAFETY RECALL ***

NHTSA Recall No. 21E-032

April 28, 2021

Blue Bird Corporation
3920 Arkwright Rd,
Macon, GA 31210

Dear Cummins OEM Customer:

We are writing to inform you that Cummins Inc. has determined that a safety-related defect exists in certain L9 and ISX12 engines that were manufactured between January 2, 2017 and October 16, 2020. Cummins has initiated a recall of the subject engines. Our records indicate that some of these engines have been shipped to you.

A copy of Cummins’ initial Part 573 Defect Notification report is enclosed. This notification was submitted to the National Highway Traffic Safety Administration (NHTSA) on April 20, 2021. As more fully described in the Defect Notification, fuel rail assembly may develop leaks, which may result in an undetected prolonged diesel fuel spray. A leak involving spraying/misting fuel in the presence of an ignition source may increase the risk of fire.

Enclosed is a list of the affected systems that our records indicate were shipped to your plants. For systems installed in vehicles that have left your control, we encourage you to make a safety defect determination in accordance with 49 USC 30118 et seq. and, as appropriate, to submit a Defect Notification to NHTSA in accordance with 49 CFR Part 573. Cummins will conduct the recall, including notifying owners pursuant to 49 CFR Part 577, performing the remedy, and submitting quarterly status reports to NHTSA. Cummins is requesting that you provide the associated vehicle model identification, VINs and owner contact information to facilitate owner notification. Please work with your Cummins account team leader to ensure that the requested information is provided to Cummins as soon as possible.

For engines/vehicles that are still in your inventory, please contact the Customer Quality

Assurance at the Jamestown Engine Plant (for ISX12 engines) or at the Rocky Mount Engine Plant (for L9 engines) to arrange for repairs, as necessary. Please note that Federal law prohibits delivery of these engines, or vehicles equipped with these engines, under a sale or lease until this condition has been remedied.

Cummins will conduct a safety campaign to address this condition. Cummins is developing the remedy plan and will communicate it as soon as it is available.

Cummins apologizes for this inconvenience, but we are initiating this action in the interest of our customers’ safety and satisfaction with our products. Thank you for your assistance.

Please confirm receipt of this communication.

Sincerely,

OEM Account Manager Cummins Inc.

@cummins.com

Enclosures:

Cummins Part 573 Defect Notification
List of engines

*** IMPORTANT SAFETY RECALL***
NHTSA Recall No. 21E-032
Interim Recall Notice

June 18, 2021

Dear Cummins Customer:

This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act. Cummins Inc. has decided that a defect which relates to motor vehicle safety exists in certain Cummins L9 and ISX12 engines manufactured between January 2, 2017 and October 16, 2020 and installed in buses, school buses, emergency vehicles and recreational vehicles.

This notice applies to the engines in your vehicles listed on the enclosed table.

WHAT IS THE PROBLEM?

WHAT WILL CUMMINS DO?

Cummins is currently developing the permanent remedy for this issue. You will receive a second notification to inform you when the final remedy is available and to provide instructions to schedule the recall for your engine.

WHAT SHOULD YOU DO?

In the meantime, Cummins advises you to periodically check the fuel rails for signs of leaking and seek repairs if leaks are identified. If a leak occurs, the operator may see or smell diesel fuel and, in some cases, the check engine lamp may illuminate.

WHO SHOULD YOU CONTACT IF YOU HAVE FURTHER QUESTIONS OR CONCERNS?

If you have questions or concerns about this recall, please contact your local Cummins Distributor or authorized warranty dealer. You may also contact Cummins Care at 1-800- CUMMINS (1-800286-6467) or visit our website at care.cummins.com.

If you have a complaint relative to this recall, you may report it to the following:

Administrator
National Highway Traffic Safety Administration
1200 New Jersey Avenue, SE
Washington, DC 20590

You may also call the toll-free Vehicle Safety Hotline at 1-888-327-4236 (TTY: 1-800-424-9153); or go to https://www.safercar.gov.

If you have not registered your Cummins product, please complete the enclosed registration card or register your product at https://prodreg.cummins.com/prodreg/#/webform/contactInfo.

If you are no longer the owner of the vehicle listed on the enclosed table, please forward this notice to the new owner or provide the new owner’s contact information to Cummins so that we can notify them of this recall.

Federal law requires vehicle lessors receiving this recall notice to forward a copy of this notice to the lessee within ten (10) days. Also, it is a violation of Federal law for a dealer to deliver new vehicle or equipment covered by this recall notice under a sale or lease until the defect has been remedied.

Cummins is taking this action in the interest of safety and satisfaction with our products. We apologize for any inconvenience and thank you for your attention to this matter.

Sincerely,

Campaign Administrator
Cummins Inc.

Cummins Inc.
Box 3005
Columbus, IN 47202 – 3005 USA
Mail Code: 40911
Phone: 1 800 CUMMINS
care.cummins.com

*** IMPORTANT SAFETY RECALL***
NHTSA Recall No. 21E032
Cummins Campaign #C2423

July 30, 2021

Dear Cummins Customer:

This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act.

Cummins Inc. has decided that a defect which relates to motor vehicle safety exists in certain Cummins L9 and ISX12 engines manufactured between January 2, 2017 and October 16, 2020 and installed in buses, school buses, emergency vehicles, recreational vehicles and certain trailer-mounted generator sets.

This notice applies to your engines/vehicles listed on the enclosed table.

WHAT IS THE PROBLEM?

The fuel rail assembly may develop leaks, which may result in an undetected prolonged diesel fuel spray. A leak involving spraying/misting fuel in the presence of an ignition source may increase the risk of fire.

WHAT ARE WE DOING ABOUT THE PROBLEM?

Cummins has released field Safety Campaign #C2423 “L9/ISX12 Fuel Rail Safety Campaign for Selective North America On-Highway Applications” to correct this condition by inspecting the rail threads for damage and, if damage is found, replacing the rail and fuel lines. If no damage is found, new crush washers will be installed in the rail assembly using a special tool. This campaign is currently available at Cummins Distributors and authorized Warranty Dealers. The repair will be completed free of charge and most applications will require approximately 2.5 hours to complete.

WHAT SHOULD YOU DO?

Contact the nearest Cummins Distributor or authorized Warranty Dealer to arrange to have this campaign performed on your engine. The distributor or dealer will work with you to schedule the best date to complete this repair.

Federal law requires vehicle lessors receiving this recall notice to forward a copy of this notice to the lessee within ten (10) days. Also, it is a violation of Federal law for a dealer to deliver a new vehicle or equipment covered by this recall notice under a sale or lease until the defect has been remedied.

If you previously paid to have this recall performed on your vehicle, you may be eligible for reimbursement. Please contact Cummins Care at the number below for more information.

WHO SHOULD YOU CONTACT IF YOU HAVE FURTHER QUESTIONS OR CONCERNS?

If you have questions or concerns about this recall, please contact your local Cummins Distributor or authorized warranty dealer. You may also contact Cummins Care at 1-800CUMMINS (1-800-286-6467), or visit our website at care.cummins.com.

If you have a complaint relative to this recall, you may report it to the following:

Administrator
National Highway Traffic Safety Administration
1200 New Jersey Avenue, SE
Washington, DC 20590

You may also call the toll-free Vehicle Safety Hotline at 1-888-327-4236 (TTY: 1-800-424-9153); or go to https://www.safercar.gov.

If you have not registered your Cummins product, please complete the enclosed registration card or register your product at https://prodreg.cummins.com/prodreg/#/webform/contactInfo.

If you are no longer the owner of the engine or vehicle listed in the table below, please forward this notice to the new owner or provide the new owner’s contact information to Cummins so that we can notify them of this recall.

Cummins is taking this action in the interest of safety and satisfaction with our products. We apologize for any inconvenience and thank you for your attention to this matter.

Sincerely,

Campaign Administrator
Cummins Inc.

*** IMPORTANT SAFETY RECALL***

NHTSA Recall No. 21E032

Cummins Campaign #C2423

September 3, 2021