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Home › Jaguar › 2000 › XJ8 Base › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Trouble Code Identification › DTC P0406: EGR Valve Drive Circuit Short Circuit › Possible Causes

Possible Causes

EGR valve to ECM drive circuit pair (EGR valve pins No. 1 and 4, 6 and 3), shorted to ground or high voltage.
EGR valve failure (stepper motor short circuit).