P0400 , P0401
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Check Engine on. Poor performance.
P0400
EGR Control Valve. Circuit Open/Short To Ground
P0401
EGR Circuit Short To B+
Fault symptom
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Check Engine on. Poor performance.
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Conditions
The following conditions apply for the DTC in question:
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P0400:
EGR circuit shorted to ground/open circuit.
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P0401:
EGR circuit shorted to B+.
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Diagnostic help
The DTC indicates an electrical malfunction in the EGR circuit. If the malfunction is a mechanical one, DTC P0402 or P0403 will be generated. When a fault occurs that generates P1625, then DTCs can also be generated for the components that are supplied with power from the main relay. If there are more DTCs in the system, the fault diagnosis will start with P1625.
