P1AC9 BUICK - HCM Service Calibration Fault
- Faulty Hybrid Control Module (HCM)
- Hybrid Control Module (HCM) harness is open or shorted
- Hybrid Control Module (HCM) circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P1ac9 Buick DescriptionHybrid Control Module (HCM) The internal fault detection is handled inside the control module. No external circuits are involved.
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