LEMON Manuals: Even more car manuals for everyone
Home >> Jeep >> 2007 >> Grand Cherokee Laredo, 3.0 M >> Repair and Diagnosis >> Engine Performance >> System >> Diesel - DTCS P0591 To P0676 >> P0629-Fuel Pump Control Circuit High >> Possible Causes

Possible Causes

Possible Causes 
INTERMITTENT DTC
(K31) FUEL PUMP RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE
(K31) FUEL PUMP RELAY CONTROL CIRCUIT SHORTED TO THE (A15) FUSED ASD RELAY OUTPUT CIRCUIT
(K31) FUEL PUMP RELAY CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
FUEL PUMP RELAY
ENGINE CONTROL MODULE (ECM)

Always perform PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .