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Home >> Jeep >> 2007 >> Commander Base, 4.7 P, AWD >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P1602 To P2123 >> P1646-Hydraulic Cooling Fan Control Circuit Low >> Possible Causes

Possible Causes

Possible Causes 
(A916) FUSED B+ CIRCUIT
(K173) HYDRAULIC RADIATOR FAN SOLENOID CONTROL CIRCUIT OPEN
(K173) HYDRAULIC RADIATOR FAN SOLENOID CONTROL CIRCUIT SHORTED GROUND
INTEGRATED POWER MODULE (IPM)
FRONT CONTROL MODULE (FCM)

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