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Service bulletin 42-056

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10164378
Published by NHTSA2019-09-05
Manufacturer's number42-056
Manufacturer's date2019-08-28
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

Fix-As-Fail -“ Composite fittings used in the cooling system may crack, resulting in coolant leaks. Brass fittings are available to replace the composite fittings.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine

Vehicles listed
KENWORTH C5002016 to 2019
KENWORTH T6002017 to 2019
KENWORTH T6602016 to 2019
KENWORTH T6802016, 2017, 2018, 2019
KENWORTH T8002016 to 2019
KENWORTH T8802016, 2017, 2018, 2019
KENWORTH W9002016 to 2019
KENWORTH W9902019
PETERBILT 2102015, 2016, 2017, 2018
PETERBILT 2202015, 2016, 2017, 2018
PETERBILT 3202015, 2016, 2017, 2018, 2019, 2020
PETERBILT 3252015, 2016, 2017
PETERBILT 3302015, 2016, 2017, 2018
PETERBILT 3372015, 2016, 2017, 2018, 2019, 2020
PETERBILT 3482015, 2016, 2017, 2018, 2019, 2020
PETERBILT 3572015, 2016
PETERBILT 3652015, 2016, 2017, 2018, 2019, 2020
PETERBILT 3672015, 2016, 2017, 2018, 2019, 2020
PETERBILT 3782015, 2016
PETERBILT 3792015, 2016
PETERBILT 3822015, 2016
PETERBILT 3842015, 2016
PETERBILT 3852015, 2016
PETERBILT 3862015, 2016, 2017, 2018, 2019
PETERBILT 3872015, 2016
PETERBILT 3882015, 2016
PETERBILT 3892015, 2016, 2017, 2018, 2019
PETERBILT 389G2016 (the catalog's model; the bulletin names a series or trim of it)
PETERBILT 5202015 to 2016
PETERBILT 5202017, 2018, 2019, 2020
PETERBILT 5672015, 2016, 2017, 2018, 2019, 2020
PETERBILT 5792015, 2016, 2017, 2018, 2019, 2020
PETERBILT 5872015, 2016, 2017, 2018, 2019

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
19V2820002019-04-09. ENGINE; ELECTRICAL SYSTEM
18V6570002018-09-21. ENGINE AND ENGINE COOLING:ENGINE:DIESEL
20162892016-06-08. Engine
15V5970002015-09-24. ELECTRICAL SYSTEM:IGNITION:MODULE; ENGINE AND ENGINE COOLING:ENGINE
20154182015-09-23. Engine
15V3090002015-05-26. ENGINE AND ENGINE COOLING:ENGINE
20152112015-05-15. Engine
20140462014-02-19. Engine
14V0860002014-02-18. ENGINE AND ENGINE COOLING:ENGINE

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
P0012026-09-29. Service bulletin. "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."
E3432026-09-23. Service bulletin. An exhaust manifold slip joint seal kit is now available for EPA 2017-2024 PACCAR MX-13 engines.
43-0882026-08-20. Service bulletin. 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.
E3112026-07-30. Service bulletin. 105 chassis have been removed from the chassis list and unflagged in PRWS due to expiration of applicable warranty coverage. Total chassis population is 732.
43-0882026-07-23. Service bulletin. 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.
41-0292026-07-22. Service bulletin. Incorrect air filters may be inadvertently installed in certain chassis equipped with under-hood Donaldson air filter housings.
E3112026-07-21. Service bulletin. The Condition, Chassis Affected, Service Action, Warranty, and Procedure sections have been updated to include the latest prognostics bulletin verbiage.
43-0882026-07-21. Service bulletin. "The software is not yet available. The bulletin will be updated when more information is available."
43-0882026-07-02. Service bulletin. "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."
E3112026-06-17. Service bulletin. The PACCAR Powertrain Prognostics Webcast video link has been removed. It will be included with updated information at a later date.