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Diagnostic Procedure

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P0944-LOSS OF PRIME DIAGNOSTIC TEST REFERENCE

TEST ACTION APPLICABILITY
1
NOTE: Low fluid level can be the cause of many transmission problems. If the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information.
NOTE: Always perform diagnostics with a fully charged battery to avoid false symptoms.
With the DRBIII®, read Engine DTC's. Check and repair all Engine DTC's prior to performing any transmission symptom diagnostics.With the DRBIII®, read Transmission DTC's. Record all DTC's and 1 Trip Failures.
NOTE: Diagnose 1 Trip Failures as a fully matured DTC.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.Repair as necessary.Perform the Shift Lever Position Test. If the test does not pass, refer to Symptom test for P0706 CHECK SHIFTER SIGNAL .For Gear Ratio DTC's, check and record all CVI's.Most DTC's set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run.
NOTE: Verify flash level of Powertrain Control Module. Some problems are corrected by software upgrades to the Transmission and Engine software.
NOTE: Check for applicable TSB's related to the problem.
Perform this procedure prior to Symptom diagnosis.ContinueGo To 2		 All
2 Place the gear selector in park.
Start the engine.
NOTE: The TRANS TEMP DEG must be at least 43°C or 110°F before performing the following steps.

The Transmission must be at operating temperature prior to checking pressure. A cold Transmission will give higher readings.
Place the Transmission in Reverse.
With the DRBIII®, observe the Transmission Pressure Switch states.
Are any of the Pressure Switches closed?
Yes --> Go To 3
No --> Go To 5		 All
3 The conditions necessary to set this DTC are not present at this time.
Test drive the vehicle. Allow the Transmission to shift through all gears and ranges.
Did you experience a delayed engagement and/or a no drive condition?
Yes --> Go To 5
No --> Go To 4		 All
4 The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle the wiring while checking for shorted and open circuits.
With the DRBIII®, check the EATX EVENT DATA to help identify the conditions in which the DTC was set.
Were there any problems found?
Yes --> Repair as necessary.
Perform 42RLE (NGC) TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Test Complete.		 All
5 With the DRBIII®, perform a Shift Lever Position Test. Follow the instructions on the DRBIII®.
Did the Shift Lever Position Test pass?
Yes --> Go To 6
No --> Refer to DTC P0706 .
Perform 42RLE (NGC) TRANSMISSION VERIFICATION TEST - VER 1 .		 All
6 Remove and inspect the Transmission Oil Pan and Transmission Oil Filter per the Service Information.
Does the Transmission Oil Pan contain excessive debris and/or is the Oil Filter plugged?
Yes --> Repair the cause of the plugged Transmission Oil Filter. Refer to the appropriate Service Information for the proper repair procedure.
Perform 42RLE (NGC) TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 7		 All
7 If there are no possible causes remaining, view repair.
Repair
Replace the Transmission Oil Pump per the Service Information.
Perform 42RLE (NGC) TRANSMISSION VERIFICATION TEST - VER 1 .		 All
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