Service bulletin C2551
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 | 10253763 |
| Published by NHTSA | 2024-05-01 |
| Manufacturer's number | C2551 |
| Manufacturer's date | 2024-04-18 |
| NHTSA component | ENGINE AND ENGINE COOLING |
NHTSA's summary
This campaign is being issued to recalibrate the Engine Control Module (ECM) on certain MY2013 - 2016, ISL9 engines in Series Parallel Hybrid bus applications with Allison Transmission systems. This campaign enables authorized repair locations to recalibrate the ECM to the latest revision. This calibration update may provide improvements to the monitoring frequency of certain on-board diagnostics in order to meet the in-use monitor performance ratio (IUMPR) requirements.
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
| CUMMINS ISL9 |
|---|
Listing a model year does not mean every vehicle of it is concerned: the document says which.