21KWG – Work Brake May Unintentionally Disengage – 2019-2022 Kenworth T880, W990 Wrecker & Auto Hauler

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November 19, 2021 NHTSA CAMPAIGN NUMBER: 21V906000

Work Brake May Unintentionally Disengage

Unintended vehicle movement can increase the risk of a crash or injury.

 

NHTSA Campaign Number: 21V906

Manufacturer PACCAR Incorporated

Components SERVICE BRAKES, AIR, ELECTRICAL SYSTEM

Potential Number of Units Affected 908

 

Summary

PACCAR Incorporated (PACCAR) is recalling certain 2019-2022 Kenworth T880, W990, Peterbilt 567, 579, 389, and 2022 Peterbilt 536, 537 wrecker and auto hauler vehicles. The work brake (winch brake) may unintentionally disengage the service brakes during winching operations, causing the vehicle to roll.

 

Remedy

Dealers will update the vehicle software, free of charge. Owner notification letters were mailed on January 3, 2022. Owners may contact PACCAR customer service at 1-425-828-5888 (Kenworth); or 1-940-591-4220 (Peterbilt). PACCAR’s numbers for this recall are 21KWG and 21PBM.

 

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.nhtsa.gov.

 


What’s New

Safety Recall – Work brake may unintentionally disengage. The work brake (also known as winch brake) may unintentionally disengage during winching operations, releasing the service brakes, increasing the risk of crash or injury. The VECU software will be updated to correctly set the speed interlock parameter.

 

Introduction

The work brake, also known as winch brake, may unintentionally disengage during winching operations, releasing the service brakes.

Slight vehicle movement during winching causes the wheel speed sensor to detect vehicle movement. There is “noise” in the wheel speed sensor at lower vehicle speeds, and erroneous values are communicated. These erroneous values exceed the speed interlock, causing the work brake to disengage.

 

Situation

544 chassis (534 U.S. and 10 Canada) W990 and T880 chassis built from 08/22/2018 through 11/03/2021 and equipped with a work brake (winch brake) and intended service as a wrecker or auto hauler.

 

Resolution

Service all affected chassis that enter your dealership, even if the customer has no issue with the chassis.

1. Review the attached chassis list for your dealer code and schedule your customer(s) for service if their chassis is on the list.

2. If you are not using Service Management to start repair orders, review SIR for “Complete” or “In Process” next to the “21KWG” campaign code prior to performing this repair.

3. Follow the procedures below to update the VECU software and correctly set the speed interlock parameter.

Federal Law

It is a violation of Federal law for a dealer to sell or lease new vehicles covered by this recall until the defect or noncompliance has been corrected.

 

Procedure

Please follow your dealership’s safety procedures and precautions to ensure the vehicle can be safely repaired and maintained.

Go to PVP and verify the parameter (either N815 or AA01153) is set to 30MPH. Change to 30MPH if needed.

Consult the chassis list to confirm the electrical architecture (VMUX or CVMUX) of the chassis. Refer to the appropriate procedure below.

Update instructions for CVMUX chassis

1. Ensure DAVIE4 is up to date.

2. Connect a battery charger to the chassis.

3. Ensure all programs except DAVIE4 are closed when you begin programming.

4. Update the VECU software to the latest available version.

5. Ensure ESA is up to date. Refer to bulletin 03-064 for ESA best practices for software update instructions and other tips.

6. Update the CECU software to the latest available version.

 

Update instructions for VMUX chassis

1. Ensure DAVIE4 is up to date.

2. Connect a battery charger to the chassis.

3. Ensure all programs except DAVIE4 are closed when you begin programming.

4. Update the VECU software to the latest available version.

 

Parts

Parts are not required.

 


Chronology :

10-23-20: Driver reports hearing air exhaust and work brakes release during a winching operation, causing the vehicle to roll. No injuries or property damage was reported. Driver was able to manually apply brakes. Field service notified, engineering initiates investigation, and troubleshooting guidance is provided.

12-01-20: Field visits are completed with no issues identified, and unable to replicate customer complaint. All involved parts replaced as a precaution were reviewed with no issues identified. Investigation is placed in monitor status.

07-29-21: Dealership notifies Kenworth of customer reporting work brakes automatically disengaging on July 19. Investigation begins to understand details of recent event.

08-19-21: Technical team on-site at customer replicates complaint. Two trucks were used, one was winching the other truck. During the winching operation, the vehicle moved slightly, the team heard air exhaust, and the work brakes released. Upon further review, the wheel speed sensor noted there is “noise” in the sensor signal at speeds up to 7mph, and may be communicating an erroneous value. Certain vehicles are equipped with a work brake speed interlock, which causes the work brake to disengage at speeds above a set value. The team hypothesized that the “noise” in the sensor signal may be exceeding the speed interlock value, resulting in the work brakes disengaging. The investigation continued to evaluate this hypothesis further.

10-27-21: Team completes investigation and recommends increasing speed interlock value for all vehicles in wrecker applications.

11-10-21: The affected population is confirmed.

11-12-21: Production clean point for wrecker applications.

11-16-21: Safety committee meeting held. The committee agrees that a safety defect exists and that the affected population shall be recalled.

11-18-21: Production clean point for auto hauler applications.

 


22 Affected Products

Vehicles

MAKE MODEL YEAR
KENWORTH T880 2019-2022
KENWORTH W990 2019-2022
PETERBILT 389 2019-2022
PETERBILT 536 2022
PETERBILT 537 2022
PETERBILT 567 2019-2022
PETERBILT 579 2019-2022

 


12 Associated Documents

Defect Notice 573 Report

RCLRPT-21V906-1975.PDF 216.054KB

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Recall 573 Report – Amendment 3

RCLRPT-21V906-6632.PDF 216.271KB

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Recall 573 Report – Amendment 2

RCLRPT-21V906-6282.PDF 216.275KB

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Recall Acknowledgement

RCAK-21V906-6269.pdf 652.035KB

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Recall 573 Report – AMENDMENT 1

RCLRPT-21V906-8934.PDF 216.052KB

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Safety Bulletin

RCSB-21V906-2322.pdf 669.069KB

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ISSUED Owner Notification Letter(Part 577)

RCONL-21V906-7870.pdf 199.194KB

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Remedy Instructions and TSB

RCRIT-21V906-9526.pdf 187.573KB

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Recall Quarterly Report #1, 2022-1

RCLQRT-21V906-8233.PDF 211.15KB

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Recall Quarterly Report #2, 2022-2

RCLQRT-21V906-8043.PDF 211.248KB

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Recall Quarterly Report #2, 2022-2

RCLQRT-21V906-6009.PDF 211.244KB

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Recall Quarterly Report #3, 2022-3

RCLQRT-21V906-7198.PDF 211.322KB

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Latest Recalls Documents

https://www-odi.nhtsa.dot.gov/acms/cs/documentList.xhtml?docId=21V906&docType=RCL

 


 

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Last update on 2024-06-29 / Affiliate links / Images from Amazon Product Advertising API

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