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November 9, 2023 Service bulletin

Customer Satisfaction Program

Chevrolet technical service bulletin N232427260 for 2021 Chevrolet 6500HD.

Bulletin number
N232427260
Component
Electrical system
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

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