P00A3 OBD II Trouble Code Charge Air Cooler Temperature Sensor Circuit Low Bank 2

How to diagnose, repair, and info on causes of a P00A3 engine code which involves the bank 2 charge air cooler temperature sensor circuit, which is detected as low. Also includes links to relevant forum topics on the code.

Symptoms of P00A3 OBD II Trouble Code

  • Illuminated check engine light
  • Poor engine performance
  • Decreased fuel economy
  • Vehicle stuck in "limp" mode
  • Diesel particulate filter regeneration inhibited (if equipped)

Common Causes of P00A3 OBD II Trouble Code

  • Faulty sensor
  • Wiring problems
  • Failed or restricted charge air cooler
  • Faulty PCM

Severity of P00A3 OBD II Trouble Code

The severity of these codes is moderate.