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Service bulletin TSB220086-042620

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 id10211750
Published by NHTSA2022-05-16
Manufacturer's numberTSB220086-042620
Manufacturer's date2022-04-26
NHTSA componentENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM; ENGINE

NHTSA's summary

This Technical Service Bulletin describes the modified troubleshooting for fault code 8156, due to internal issues found within the connectivity module can cause malfunctions with ECM communication.

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

Electrical system, Engine

Vehicles listed
CUMMINS B6.7
CUMMINS L9
CUMMINS X12
CUMMINS X15

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