- 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 DescriptionHybrid Control Module (HCM) The internal fault detection is handled inside the control module. No external circuits are involved.
P1AC9 Information for specific makes
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