P1AC9 CHEVROLET – HCM Service Calibration Fault

P1AC9 CHEVROLET Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1AC9 CHEVROLET Possible Causes

Faulty Hybrid Control Module (HCM),Hybrid Control Module (HCM) harness is open or shorted,Hybrid Control Module (HCM) circuit poor electrical connection

P1AC9 CHEVROLET Description

Hybrid Control Module (HCM) The internal fault detection is handled inside the control module. No external circuits are involved.