# Service bulletin 45\-070

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: 11028314
- Published by NHTSA: 2026\-02\-05
- Manufacturer's number: 45\-070
- Manufacturer's date: 2026\-01\-31
- Campaign id or software version: 45\-070
- NHTSA component: ENGINE

## NHTSA's summary

Procedure pictures updated for clarity. When troubleshooting Cummins X15 fault codes 555 or 556, follow this additional testing, inspection, and documentation procedure to help identify the root cause of dusted engines. This is not a stand\-alone process but must be used alongside Cummins troubleshooting steps. Cummins Quickserve will reference this bulletin for fault codes 555 or 556.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11028314-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11028314-9999.pdf)

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

## Components

Engine

## Vehicles listed

- 2017 to 2025 KENWORTH C500
- 2025 KENWORTH C500 EXP
- 2024 to 2025 KENWORTH C500B
- 2017 to 2026 KENWORTH T680
- 2017 to 2025 KENWORTH T800
- 2021 to 2025 KENWORTH T800B
- 2017 to 2026 KENWORTH T880
- 2017 to 2025 KENWORTH W900
- 2021 to 2025 KENWORTH W900B
- 2017 to 2025 PETERBILT 365
- 2017 to 2025 PETERBILT 367
- 2017 to 2025 PETERBILT 389
- 2017 to 2026 PETERBILT 567
- 2017 to 2026 PETERBILT 579
- 2024 to 2026 PETERBILT 589

## Recalls for the same vehicles and component

- [2022470](/recalls/tc/2022470.md), 2022-08-18: Engine
- [22V631000](/recalls/nhtsa/22V631000.md), 2022-08-17: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\)
- [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

## 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."
- [41\-028](/bulletins/11037539.md), 2026-09-29, Service campaign: ENGINE. The campaign expiration date has been extended from 10/01/2026 to 04/01/2027.
- [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.
- [P003](/bulletins/11037450.md), 2026-09-23, Service bulletin: ENGINE. "KW: A link to the PACCAR Powertrain Prognostics Webcast has been added in the Links section. PB: The chassis list has been updated to include 1 chassis. The total chassis count is now 10. A link to the PACCAR Powertrain Prognostics Webcast has been added in the Links section."
- [P001](/bulletins/11037449.md), 2026-09-23, Service bulletin: ENGINE. "KW: The chassis list has been updated to include 1 chassis. The total chassis count is now 53. A link to the PACCAR Powertrain Prognostics Webcast has been added in the Links section. PB: The chassis list has been updated to include 8 chassis. The total chassis count is now 130. A link to the PACCAR Powertrain Prognostics Webcast has been added in the Links section."
- [P002](/bulletins/11037448.md), 2026-09-23, Service bulletin: ENGINE. "KW: A link to the PACCAR Powertrain Prognostics Webcast has been added in the Links section. PB: The chassis list has been updated to include 2 chassis. The total chassis count is now 4. A link to the PACCAR Powertrain Prognostics Webcast has been added in the Links section."
- [P003](/bulletins/11036428.md), 2026-08-27, Service bulletin: ENGINE. "KW: A link to the PACCAR Powertrain Prognostics Webcast has been added in the Links section. PB: The chassis list has been updated to include 1 chassis. The total chassis count is now 10. A link to the PACCAR Powertrain Prognostics Webcast has been added in the Links section."
- [P002](/bulletins/11036427.md), 2026-08-27, Service bulletin: ENGINE. "KW: A link to the PACCAR Powertrain Prognostics Webcast has been added in the Links section. PB: The chassis list has been updated to include 2 chassis. The total chassis count is now 4. A link to the PACCAR Powertrain Prognostics Webcast has been added in the Links section."
- [P001](/bulletins/11036426.md), 2026-08-27, Service bulletin: ENGINE. "KW: The chassis list has been updated to include 1 chassis. The total chassis count is now 53. A link to the PACCAR Powertrain Prognostics Webcast has been added in the Links section. PB: The chassis list has been updated to include 8 chassis. The total chassis count is now 130. A link to the PACCAR Powertrain Prognostics Webcast has been added in the Links section."
- [43\-089](/bulletins/11036342.md), 2026-08-25, Service bulletin: ENGINE. This optional software update is expected to be available after 08/28/2026.

JSON: [/v1/bulletins/11028314](/v1/bulletins/11028314)

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