# Service bulletin 36\-005

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10171021
- Published by NHTSA: 2020\-02\-05
- Manufacturer's number: 36\-005
- Manufacturer's date: 2020\-01\-31
- NHTSA component: VEHICLE SPEED CONTROL; SERVICE BRAKES

## NHTSA's summary

Information Only \- Driver Performance Assistance \(DPA\) Coasting and Braking Scores Not Incrementing, Stays at 50%. The average score will never change nor create driver assistance popups based upon driver’s actions. A future software update will resolve the issue. This bulletin will be updated when the software update becomes available.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10171021-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10171021-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Brakes, Throttle and cruise control

## Vehicles listed

- 2020 to 2021 KENWORTH T680
- 2020 to 2021 KENWORTH T880
- 2020 to 2021 KENWORTH W990
- 2021 PETERBILT 567

## Recalls for the same vehicles and component

- [2024744](/recalls/tc/2024744.md), 2024-12-09: Brakes
- [24V915000](/recalls/nhtsa/24V915000.md), 2024-12-09: ELECTRICAL SYSTEM:SOFTWARE; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
- [2024121](/recalls/tc/2024121.md), 2024-02-23: Brakes
- [24V145000](/recalls/nhtsa/24V145000.md), 2024-02-23: SERVICE BRAKES, AIR:SUPPLY:RESERVOIR/TANK
- [2021713](/recalls/tc/2021713.md), 2021-11-19: Brakes
- [21V906000](/recalls/nhtsa/21V906000.md), 2021-11-19: ELECTRICAL SYSTEM:SOFTWARE; SERVICE BRAKES, AIR
- [2021521](/recalls/tc/2021521.md), 2021-08-20: Brakes
- [21V648000](/recalls/nhtsa/21V648000.md), 2021-08-19: SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:HOSES, LINES/PIPING, AND FITTINGS
- [2020461](/recalls/tc/2020461.md), 2020-09-29: Brakes
- [20V593000](/recalls/nhtsa/20V593000.md), 2020-09-28: SERVICE BRAKES, AIR:ANTILOCK

## Other bulletins for the same vehicles and component

- [24KWE/24PBE](/bulletins/11027065.md), 2026-01-06, Emissions: SERVICE BRAKES. The parts section has been updated for clarity. The right\-hand shift stalk may have an improper wire harness terminal crimp within the wire harness connector. Loss of communication between the right\-hand shift stalk and the vehicle may result in the vehicle being disabled after it comes to a stop, thereby increasing the risk of crash or injury. A warning will appear on the dash display when communication is lost, including transmission or engine warnings, “\!” next to DNR/DNRP indicator, “\-“ in the DNR/DNRP indicator, and/or chimes, depending upon whether you are operating a diesel/gas or battery electric vehicle.
- [24KWD](/bulletins/11024956.md), 2025-11-05, Service bulletin: SERVICE BRAKES. SAFETY RECALL Additional chassis have been included. The chassis list has been updated. Certain T370 / T440 / T470 / T480 / T660 / T680 / T800 / T880 / W900 / C500 chassis may be equipped with air tank reservoirs that have less than twelve times the combined volume of all service brake chambers which fail to conform to Federal Motor Vehicle Safety Standard \(FMVSS\) No.121, Air Brake Systems.
- [24KWD](/bulletins/10254164.md), 2024-05-04, Service bulletin: SERVICE BRAKES, AIR. Certain C500/T440/T470/T660/T680/T800/T880/W900 chassis may have air tank reservoirs that do not meet air volume requirements per FMVSS/CMVSS 121 “Air Brake Systems”. This bulletin will be updated when repair parts and procedures are available.
- [13\-060](/bulletins/10219235.md), 2022-09-06, Service bulletin: SERVICE BRAKES. The service information for Bendix Air Dryer maintenance is being updated to include new procedures.
- [13\-057](/bulletins/10209699.md), 2022-04-05, Service bulletin: EQUIPMENT; SERVICE BRAKES, AIR; EQUIPMENT ADAPTIVE/MOBILITY; SERVICE BRAKES, HYDRAULIC. Fix\-As\-Fail – A hill start assist \(HSA\) valve plumbing revision eliminates ice buildup in the HSA valve exhaust in cold weather.
- [21PBM](/bulletins/10206090.md), 2022-01-06, Service bulletin: SERVICE BRAKES, HYDRAULIC. Safety Recall – Work Brake May Unintentionally Disengage – NHTSA ID: 21V906, TC: 2021\-713. 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.
- [13\-055](/bulletins/10182219.md), 2020-11-05, Service bulletin: EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT; SERVICE BRAKES, AIR. Fix as Fail: Peterbilt has introduced an improved mounting bracket for low mount air tanks for vehicles built between January 01, 2017 and July 06, 2020. Torsional vibration may stress the currently\-installed brackets and cause them to fail near the bottom of the frame rail.
- [E240](/bulletins/10168654.md), 2019-12-04, Service bulletin: VEHICLE SPEED CONTROL. Fix As Fail\-Shudder sensation near the governed vehicle speed when using cruise control due to excessive control messaging from VECU. A VECU software update is available to correct the condition.

JSON: [/v1/bulletins/10171021](/v1/bulletins/10171021)

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