Possible Causes

Possible causes are:

• Carbon buildup in EEGR valve seat (DTCs P0400 or P1408).
• Connector to EEGR not seated (DTCs P0400, P0403 or P0408).
• Damaged PCM (DTCs P0400, P0403 or P1408).
• EEGR motor windings shorted or open (DTCs P0400, P0403 or P1408).
• EEGR valve stuck open or closed (DTCs P0400 or P1408).
• Harness open or shorted to power or ground (DTCs P0400 or P1408).
• MAF/IAT sensor signal erroneous (DTCs P0400 or P1408).
• No power to EEGR (DTCs P0400 or P1408).
• One or more sensors not responding or out of range (DTCs P0400 or P1408).
• Open or short in harness from PCM to EEGR (DTC P0403).
• Short circuit in EEGR motor (DTC P0403).
• Vacuum signal to MAP restricted or leaking (DTCs P0400 or P1408).