# Service campaign E335

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 campaign
- NHTSA id: 11029643
- Published by NHTSA: 2026\-03\-05
- Manufacturer's number: E335
- Manufacturer's date: 2026\-02\-20
- Campaign id or software version: E335
- NHTSA component: ENGINE

## NHTSA's summary

Certain EPA21 compliant PACCAR MX\-13 engines were built with intake valve springs that could fail. This failure can cause significant damage to the engine. New intake valve springs will be installed.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11029643-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11029643-9999.pdf)

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

## Components

Engine

## Vehicles listed

- 2021 PACCAR MX\-13

JSON: [/v1/bulletins/11029643](/v1/bulletins/11029643)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20campaign%20E335&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11029643&vehicle=Service%20campaign%20E335)