OBD Codes List

Diagnostic reference · P0A3B

P0A3B

Generator A Over Temperature

System
Powertrain control (P code)
Lamp
Check Engine Light
Category
Powertrain - Hybrid Propulsion

What it means

P0A3B means Generator A Over Temperature.

Check these first

  • A failing generator A bearing or internal fault
  • Low or degraded generator coolant flow
  • A failed generator temperature sensor
  • Overloading from extended high-load operation

What to do next

  1. Check the generator coolant level and flow
  2. Compare the generator A temperature reading against a known-good value
  3. Inspect the generator cooling passages for blockage
  4. Check for abnormal noise or drag from generator A
  5. Replace the generator or temperature sensor after testing
  6. Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-08-30.