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Possible Causes

Possible Causes 
(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. See  DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure  . 

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