Diagnostic Aids

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the connectors at the PCM, the transmission fluid pressure switch, and all other circuit connecting points for an intermittent condition. Refer to Testing for Intermittent Conditions and Poor Connections .
Inspect the circuit wiring for an intermittent condition. Refer to Testing for Electrical Intermittents .
Inspect the 4th clutch pressure switch wires for a shorted condition.
Inspect the 4th clutch pressure switch for a stuck ON condition.
Inspect for an internal fault of the PCM.

DTC P0872

Step	Action	Yes	No
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Install a scan tool. Turn ON the ignition, with the engine OFF. IMPORTANT: Before clearing the DTC, use the scan tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the PCM. Record the DTC Freeze Frame and Failure Records. Clear the DTC. Drive the vehicle in 5th gear D range for 10 seconds. Stop the vehicle. Select Specific DTC. Enter DTC P0872. Does DTC P0872 run and fail?	Go to Step 3	Go to Diagnostic Aids In This Test
3	Turn OFF the ignition. Disconnect the 4th clutch pressure switch connector. Turn ON the ignition, with the engine OFF. With a scan tool, observe the TFP Switch 4 parameter. Does the scan tool display HI?	Go to Step 6	Go to Step 4
4	Test the 4th clutch pressure switch signal circuit for a short to ground. Refer to Testing for Short to Ground and Wiring Repairs . Did you find and correct the condition?	Go to Step 9	Go to Step 5
5	Inspect for poor connections at the PCM harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 9	Go to Step 7
6	Inspect for poor connections at the 4th clutch pressure switch harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 9	Go to Step 8
7	IMPORTANT: Always perform the PCM set up procedure. Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Perform the PCM set up procedure. Did you complete the replacement?	Go to Step 9	-
8	Replace the 4th clutch pressure switch. Refer to 4th Clutch Pressure Switch Replacement . Did you complete the replacement?	Go to Step 9	-
9	Perform the following procedure in order to verify the repair: Select DTC. Select Clear Info. Operate the vehicle under the following conditions: Drive the vehicle in 5th gear D range for 10 seconds. Stop the vehicle. Select Specific DTC. Enter DTC P0872. Has the test run and passed?	Go to Step 10	Go to Step 2
10	With the scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed?	Go to Diagnostic Trouble Code (DTC) List - Vehicle	System OK