DTC P0277 Chevrolet
LIN communication. Alternator Control Module (ACM) (Faulty Communication)
LIN communication. Alternator Control Module (ACM) (Faulty Communication)
Description
Engine control module (ECM) communicates with alternator control module (ACM) and the Premair sensor via LIN-communication. LIN is a standardized serial communication method (Local Interconnect Network). The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects communication interference. The diagnostic trouble code (DTC) can be diagnosed when the engine is running. Substitute value: The alternator control module (ACM) charges at a fixed voltage of 13.8 V.
Cause and Solution
Alternator control module (ACM), incorrect communicationContact resistance and oxidation in the terminalsOpen-circuit in the LIN wiringShort-circuit between the LIN wiring.Internal fault in another unit in the same part of the LIN network.Damaged alternator control module (ACM) (charge regulator).Generator with a charge regulator not intended for LIN communication installed.Premair sensor, faulty communicationContact resistance or oxidation in the terminals.Open-circuit in the LIN wiring between the Engine control module (ECM) and Premair sensor.Faulty Premair sensor (wrong radiator).
Video Guide
Diagnostic Info
- DTC Code: P0277
- Brand: Chevrolet