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Possible Causes

Possible Causes 
INTERMITTENT DTC
(Z904) GROUND CIRCUIT OPEN OR HIGH RESISTANCE
(K35) EGR CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
EXHAUST GAS RECIRCULATION VALVE
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to *PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

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