OBDII Code List

P1AC9 BUICK - HCM Service Calibration Fault

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

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

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1ac9 Buick Description

Hybrid Control Module (HCM) The internal fault detection is handled inside the control module. No external circuits are involved.
OBDII Code P1ac9 Buick - HCM Service Calibration Fault -

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P1AC9 BUICK Comments

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