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Service bulletin N232427260

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 id10245187
Published by NHTSA2023-11-09
Manufacturer's numberN232427260
Manufacturer's date2023-11-09
NHTSA componentELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING:ENGINE:DIESEL

NHTSA's summary

Customer Satisfaction Program - Certain vehicles may experience an illuminated Check Engine Malfunction Indicator Lamp (MIL) with Diagnostic Trouble Code (DTC) P2201 NOx Sensor Circuit Performance Sensor 1 and/or DTC P20EE Diesel Exhaust Fluid (DEF) System NOx Trap Low Efficiency set in the DEF Control Unit (DCU). Dealers will reprogram the diesel exhaust fluid control module with a corrected service calibration

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

Trouble codes named

P20EE, P2201

Vehicles listed
CHEVROLET 6500HD2021

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