P042E OBD II Trouble Code Exhaust Gas Recirculation A Control Stuck Open

How to quickly diagnose, repair, and info on causes and symptoms of a P042E code that indicates a stuck open A EGR control situation.

Symptoms of P042E OBD II Trouble Code

  • Rough engine idle
  • Diminished fuel efficiency
  • Excessively lean exhaust
  • Other drivability codes may be stored

Common Causes of P042E OBD II Trouble Code

  • Defective EGR valve
  • EGR valve plunger clogged by carbon or other debris
  • EGR control solenoid/valve is bad
  • Open or shorted wiring/connectors in the EGR A control circuit
  • Faulty DPFE sensor
  • Bad EGR valve position sensor
  • PCM malfunction or PCM programming error

Severity of P042E OBD II Trouble Code

The conditions which lead to a stored code P042E may also result in serious drivability issues. For this reason, a code P042E should be addressed with urgency.