P1A8A SATURN - 42 Volt System Voltage High
- Faulty Accessory Power Module (APM)
- Accessory Power Module (APM) harness is open or shorted
- Accessory Power Module (APM) circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P1a8a Saturn DescriptionThe 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.
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