Engine-Codes - Gmc - P0A90 GMC

P0A90 GMC Code - Drive Motor Performance

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

|P0A90 GMC code possible causes

  • Inspect the drive belt for cracks, wear and contamination
  • Faulty Starter Generator
  • Starter Generator harness is open or shorted
  • Starter Generator circuit poor electrical connection

|How is the P0A90 GMC code repair?

Start by checking 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.

|What is the cost to diagnose the P0A90 GMC code

Labor: 1.0

The cost to diagnose the P0A90 GMC code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are P0A90 GMC code possible symptoms?

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

|What is P0A90 GMC code meaning?

The generator control module also called the starter generator control module is comprised of the following three control modules; the hybrid powertrain control module, 14 volt power module and the drive motor control module. These three control modules are non serviceable and are part of the generator control module.
The eAssist hybrid system has a starter generator also called a drive motor. The starter generator is mounted to the front of the engine and is mechanically connected to the crankshaft pulley by a serpentine belt.
The hybrid powertrain control module receives an engine RPM signal over serial data and compares that value to the starter generator rpm received from the drive motor control module. The hybrid powertrain control module uses a ratio of these two speeds to determine if the drive belt is missing or slipping.

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