P20A3 OBD II Trouble Code Reductant Purge Control Valve Circuit High

How to quickly diagnose and repair, and causes of a P20A3 circuit code which indicates a detected high resistance or voltage in the reductant purge control valve circuit.

Symptoms of P20A3 OBD II Trouble Code

  • Poor engine performance
  • Decreased fuel economy
  • Check engine light illuminated

Common Causes of P20A3 OBD II Trouble Code

  • Defective reductant purge control valve
  • Faulty or damaged wiring
  • Loose or defective control module ground strap
  • Corroded, damaged or loose connector
  • Defective fuse or fuse-able link (If applicable)
  • Defective PCM or ECM

Severity of P20A3 OBD II Trouble Code

The severity of this code is normally moderate, but P20A3 can be severe if harmful gases are being expelled from the exhaust which becomes a safety concern requiring immediate attention.