P1A8A - 42 Volt System Voltage High

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

  • Faulty Accessory Power Module (APM)
  • Accessory Power Module (APM) harness is open or shorted
  • Accessory Power Module (APM) circuit poor electrical connection

Possible symptoms

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

P1a8a Description

The Accessory Power Module (APM) supplies the energy that flows between the high voltage, 300 volt, direct current (DC) and intermediate voltage, 42 volt, DC to support the Electric Power Steering (EPS). The APM receives a 42 volt enable command from the Hybrid Powertrain Control Module (HPCM) over the high speed hybrid GMLAN communication circuit. 42 volt APM functions will run only when the 42 volt APM enable is active on the high speed hybrid GMLAN communication circuit.
OBDII Code P1a8a - 42 Volt System Voltage High - AutoCodes.com

P1A8A Information for specific makes

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P1A8A Comments

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