42 Volt System Performance
Table of contents
P1A88 CHEVROLET Possible Causes
- Faulty Accessory DC Power Control Module (APM)
- Accessory DC Power Control Module (APM) harness is open or shorted
- Accessory DC Power Control Module (APM) circuit poor electrical connection
How do I fix code P1A88 CHEVROLET?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P1A88 CHEVROLET code
The cost of diagnosing the P1A88 CHEVROLET code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1A88 CHEVROLET Description
The Accessory DC Power Control 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.
The APM continuously monitors the status of its 42 volt circuitry. It will do some diagnostics on this circuitry when the ignition key is first turned to RUN. Additional diagnostics are run while the APM is doing 42 volt conversions after receiving the 42 volt enable command.