# Service bulletin 43\-072

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: 10238382
- Published by NHTSA: 2023\-07\-05
- Manufacturer's number: 43\-072
- Manufacturer's date: 2023\-06\-02
- NHTSA component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM; ENGINE AND ENGINE COOLING

## NHTSA's summary

Certain chassis with Engine Model Year 2016\-2021 PACCAR MX\-11/MX\-13, or EPA13 and EPA21 Cummins ISX12/ISX15/X15 engines that had a previously failed DEF sensor and with DEF sensor software disabled due to industry DEF sensor shortages will now be able to receive a replacement DEF sensor, DEF tank heater coolant control valve, and re\-enabled DEF diagnostic software. Please note that chassis equipped with PACCAR PX engines will be eligible for this repair at a future date when software is available.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10238382-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10238382-9999.pdf)

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

## Components

Engine, Exhaust and emissions

## Vehicles listed

- 2016 to 2019 KENWORTH C500
- 2021 KENWORTH T280
- 2018 to 2021 KENWORTH T380
- 2021 KENWORTH T480
- 2017 to 2020 KENWORTH T600
- 2016 to 2019 KENWORTH T660
- 2016 to 2021 KENWORTH T680
- 2016 to 2020 KENWORTH T800
- 2021 KENWORTH T800B
- 2016 to 2021 KENWORTH T880
- 2016 to 2021 KENWORTH W900
- 2018 to 2021 KENWORTH W990

## Recalls for the same vehicles and component

- [21V080000](/recalls/nhtsa/21V080000.md), 2021-02-17: ENGINE
- [18V657000](/recalls/nhtsa/18V657000.md), 2018-09-21: ENGINE AND ENGINE COOLING:ENGINE:DIESEL
- [2016289](/recalls/tc/2016289.md), 2016-06-08: Engine
- [15V597000](/recalls/nhtsa/15V597000.md), 2015-09-24: ELECTRICAL SYSTEM:IGNITION:MODULE; ENGINE AND ENGINE COOLING:ENGINE
- [2015418](/recalls/tc/2015418.md), 2015-09-23: Engine

## Other bulletins for the same vehicles and component

- [P001](/bulletins/11037541.md), 2026-09-29, Service bulletin: ENGINE. "Kenworth: Dealers should check the chassis list and SIR weekly for VIN changes. 2 chassis added to the chassis list. Peterbilt: Dealers should check the chassis list and SIR weekly for VIN changes. 10 chassis added to the chassis list."
- [E343](/bulletins/11037451.md), 2026-09-23, Service bulletin: ENGINE. An exhaust manifold slip joint seal kit is now available for EPA 2017\-2024 PACCAR MX\-13 engines.
- [43\-088](/bulletins/11036289.md), 2026-08-20, Service bulletin: ENGINE. The procedure has been updated to include additional steps for verifying the software level on the vehicle electronic control unit \(VECU2\) and digital display \(DD\). Steps have also been added to the PACCAR Common Rail Injection 2 \(PCI2\) software verification.
- [43\-088](/bulletins/11035202.md), 2026-07-23, Service bulletin: ENGINE. This optional software update is now available for chassis equipped with EMY 2021B\-2023 PACCAR MX\-11 and MX\-13 engines. This update provides customers with additional time to service their trucks before a DEF\-related derate occurs. The software is being offered to customers in alignment with recently updated regulatory agency guidance.
- [41\-029](/bulletins/11035149.md), 2026-07-22, Service bulletin: ENGINE. Incorrect air filters may be inadvertently installed in certain chassis equipped with under\-hood Donaldson air filter housings.
- [E316](/bulletins/11035112.md), 2026-07-21, Service bulletin: ENGINE. The Condition, Chassis Affected, Service Action, Warranty, and Procedure sections have been updated to include the latest prognostics bulletin verbiage.
- [E311](/bulletins/11035111.md), 2026-07-21, Service bulletin: ENGINE. The Condition, Chassis Affected, Service Action, Warranty, and Procedure sections have been updated to include the latest prognostics bulletin verbiage.
- [43\-088](/bulletins/11035108.md), 2026-07-21, Service bulletin: ENGINE. "The software is not yet available. The bulletin will be updated when more information is available."
- [43\-088](/bulletins/11034394.md), 2026-07-02, Service bulletin: ENGINE. "An optional software update will be available on 07/06/2026 for chassis equipped with EMY 2021B\-2023PACCAR MX\-11 and MX\-13 engines. This update provides customers with additional time to service theirtrucks before a DEF\-related derate occurs. The software is being offered to customers in alignment withrecently updated regulatory agency guidance."
- [CE030](/bulletins/11034057.md), 2026-06-25, Warranty extension: ENGINE; POWER TRAIN. "KW \& PB 14 fuel injector part numbers \(seven for MX\-11 and seven for MX\-13 engines\) have been added to this warranty policy."

JSON: [/v1/bulletins/10238382](/v1/bulletins/10238382)

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