P0944 Jeep Grand Cherokee - Loss Of Hydraulic Pump Prime | Step-by-Step Diagnosis

P0944 (Loss Of Hydraulic Pump Prime) on a Jeep Grand Cherokee? This video walks through the complete 6-step factory diagnostic procedure - no guesswork, no parts cannon.

When monitored: If the transmission is slipping in any forward gear and all the pressure switches are not indicating pressure, a loss of prime test is run.
Set condition: If the transmission begins to slip in a forward gear and all the pressure switch(s) that should be closed are open a loss of prime test begins. Available elements are turned on by the PCM to see if pump prime exists. The DTC sets if no pressure switch(s) respond.

In this video:
1. Shift Lever Position Test
2. Check To See If DTC P0944 Is Current
3. Check Line Pressure In Drive And Reverse
4. Review Customer Comments
5. DTC Verification
6. Check Transmission Oil Filter

Possible causes covered: Shift Lever Out Of Adjustment; Improper Fluid Level; Cracked Or Improperly Installed Primary Oil Filter Or Seal; Loose Cooler Return Filter; Stuck Or Sticking Main Regulator Valve; Transmission Oil Pump.

Applies to the Jeep Grand Cherokee third generation (WK, 2005-2010) with the 3.7L V6, 4.7L V8 and 5.7L HEMI V8 (and SRT-8 6.1L). Much of the diagnostic logic is shared with the related Jeep Commander (XK) of the same era.

This is general information for educational purposes - always confirm against the service information for your exact vehicle.

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