Jeep Cherokee Hydraulic Fan Solenoid Circuit Fault P1499 Repair Guide

This bulletin show a guide on how to repair Jeep Cherokee hydraulic fan solenoid circuit fault P1449.This bulletin involves the replacement of the hydraulic fan solenoid instead of the complete cooling fan module.


And for more Jeep repair case,check here:Jeep Repair Case,and Jeep Cherokee Trouble Repair.



2001 – 2004 (WJ) Grand Cherokee

2001 – 2004 (WG) Grand Cherokee (International Markets)

Note:This bulletin applies to vehicles equipped with a hydraulic cooling system (sales code nmh).



The customer may experience a MIL illumination due to DTC P1499 – Hydraulic Fan Solenoid Circuit. The MIL illumination may occur intermittently.



1.Proceed with this bulletin only if the cause of the MIL illumination is due to DTC P1499 – Hydraulic Fan Solenoid Circuit Fault.

2.Refer to the 2002 or later Jeep Grand Cherokee – Powertrain Diagnostic Procedures Manual to properly diagnose DTC P1499.

3.If the diagnostic procedures determine that the hydraulic fan solenoid is at fault, then perform the Repair Procedure.


Note: the hydraulic fan solenoid listed below has been released as a separate item. the complete hydraulic fan module no longer requires replacement when only the solenoid is found to be at fault.


Parts Required:

Jeep Cherokee P0455 P0456 Evaporative System Leak Repair (1) Jeep Cherokee P0455 P0456 Evaporative System Leak Repair (2)



1.With the engine off, disconnect the negative battery cable from the negative battery terminal.

2.Raise the vehicle on a suitable lift.

3.Clean the immediate area around the hydraulic fan solenoid of any debris.

4.Disconnect the electrical harness from the hydraulic fan solenoid.

Jeep Cherokee P0455 P0456 Evaporative System Leak Repair (3)

1 – Crankshaft Pulley

2 – Ground Strap Retention Nut

3 – Ground Strap (Must Be Connected To Fan Module)

4 – Hydraulic Fan Solenoid Electrical Harness/Connector

5 – Hydraulic Fan Solenoid (Serviceable Separately)

6 – Hydraulic Fan Module

5.Have the new hydraulic fan solenoid ready for installation. Make certain that the two o-rings are in place. Notice that the armature of the solenoid can rotate within the body of the solenoid (coil). A T40 torx bit is used for removal and installation

Jeep Cherokee P0455 P0456 Evaporative System Leak Repair (4)

1- Solenoid Armature (rotates within solenoid coil/housing)

2- Solenoid Coil / Housing

3- T40 Torx Fitting

4- Solenoid Electrical Connector

5- Two Sealing O-Rings on Armature


Note: If the solenoid removal and replacement steps are performed quickly, then only a very small amount of steering fluid will drip from the fan module hydraulic fan solenoid opening. the small amount of leakage should not require prior fluid removal from the power steering reservoir.


6.Hold the connector of the solenoid to prevent the solenoid body from turning, and remove the hydraulic fan solenoid from the hydraulic fan module.

7.Immediately install the new hydraulic fan solenoid. Tighten the solenoid to 16.2 Nm (12 ft. lbs.).

8.Connect the electrical harness to the hydraulic fan solenoid.


Note: If for any reason during the repair procedure the electrical ground wire is removed from the hydraulic fan module assembly, then reconnect the ground wire and tighten the retention nut to 10 nm (7.4 ft. lbs.). failure to ensure the ground strap is properly connected could result in electrostatic discharge that may damage the PCM.

9.Lower the vehicle.

10.Connect the negative battery cable to the battery negative terminal.

11.Verify the fluid level in the power steering reservoir. Top off the fluid level as necessary.

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