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Home >> Jeep >> 2007 >> Commander Base, 4.7 P, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0581 To P0643 >> P0594-Speed Control Servo Power Relay Circuit >> Possible Causes
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Possible Causes

Possible Causes 
(V32) S/C SUPPLY CIRCUIT OPEN
(V32) S/C SUPPLY CIRCUIT SHORTED TO GROUND
(V30) S/C BRAKE SWITCH OUTPUT CIRCUIT OPEN
(V30) S/C BRAKE SWITCH OUTPUT CIRCUIT SHORTED TO GROUND
STOP LAMP SWITCH
PCM

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