Test Description

WARNING: This page is about a different car, the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

2: This step tests the ability of the TCM to command the PC solenoid valve.
3: This step tests the PC solenoid valve and automatic transmission (AT) wiring harness assembly for incorrect resistance.

DTC P0961

Step	Action	Values	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 Failure Records. Using the Clear Info function erases the Failure Records from the TCM. Record the DTC Failure Records. Clear the DTC. Start the engine. Use the scan tool in order to command 0.1 amp through 1.0 amp while observing PC Sol. Ref. Current and PC Sol. Actual Current. Is the PC Sol. Actual Current always within the specified value of the PC Sol. Ref. Current?	0.16 amp	Go to Testing for Intermittent Conditions and Poor Connections	Go to Step 3
3	Turn OFF the ignition. Disconnect the AT inline 20-way connector. Install the J 44152 Jumper Harness (20 pins) on the transmission side of the AT inline 20-way connector. See Special Tools . Using the DMM and the J 35616 GM Terminal Test Kit, measure the resistance between the PC solenoid valve high and low control circuits of the J 44152 . See Special Tools . Refer to Testing for Continuity . Refer to Automatic Transmission Inline 20-Way Connector End View .Does the resistance measure within the specified range?	3-7 Ω	Go to Step 5	Go to Step 4
4	Does the resistance measure greater than the specified value?	7 Ω	Go to Step 9	Go to Step 10
5	Measure the resistance from the PC solenoid valve high control circuit of the J 44152 to the transmission case. See Special Tools . Refer to Automatic Transmission Inline 20-Way Connector End View and Testing for Continuity . Does the resistance measure greater than the specified value?	250 K Ω	Go to Step 6	Go to Step 11
6	Disconnect the J 44152 from the transmission side of the AT inline 20-way connector. See Special Tools . Connect the transmission AT inline 20-way connector. Disconnect the TCM. Measure the resistance between TCM the PC solenoid valve high and low control circuits. Refer to Testing for Continuity .Does the resistance measure within the specified range?	3-7 Ω	Go to Step 8	Go to Step 7
7	Does the resistance measure greater than the specified value?	7 Ω	Go to Step 12	Go to Step 13
8	Using the DMM and the J 35616 , measure the resistance from TCM connector the PC solenoid valve high control circuit to ground. Refer to Testing for Continuity . Does the resistance measure greater than the specified value?	250 K Ω	Go to Step 17	Go to Step 14
9	Test the high control circuit and the low control circuit of the PC solenoid for an open between the AT inline 20-way connector and the PC solenoid. Refer to Testing for Continuity . Did you find an open condition?	-	Go to Step 16	Go to Step 15
10	Test the high control circuit and the low control circuit of the PC solenoid for a shorted together condition between the AT inline 20-way connector and the PC solenoid. Refer to Circuit Testing . Did you find a shorted together condition?	-	Go to Step 16	Go to Step 15
11	Test the high control circuit and the low control circuit of the PC solenoid for a short to ground between the AT inline 20-way connector and the PC solenoid. Refer to Testing for Short to Ground . Did you find a short to ground condition?	-	Go to Step 16	Go to Step 15
12	Test the high control circuit and the low control circuit of the PC solenoid for an open between the TCM and the AT inline 20-way connector. Refer to Testing for Continuity and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 18	-
13	Test the high control circuit and the low control circuit of the PC solenoid for a shorted together condition between the TCM and the AT inline 20-way connector. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 19	-
14	Test the high control circuit and the low control circuit of the PC solenoid for a short to ground between the TCM and the AT inline 20-way connector. Refer to Testing for Short to Ground and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 19	-
15	Replace the PC solenoid valve. Refer to Valve Body and Pressure Switch Replacement . Did you complete the replacement?	-	Go to Step 19	-
16	Replace the AT wiring harness. Refer to Valve Body and Pressure Switch Replacement . Did you complete the replacement?	-	Go to Step 19	-
17	Test the high control circuit and the low control circuit of the PC solenoid for a short to voltage. Refer to Testing for a Short to Voltage and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 19	Go to Step 18
18	Replace the TCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	-	Go to Step 19	-
19	Perform the following procedure in order to verify the repair: Select DTC. Select Clear Info. Start the engine and ensure the following condition is met: The difference between the scan tool PC Sol. Actual Current and the PC Sol. Ref. Current is less than 0.16 amp. Select Specific DTC. Enter DTC P0961. Has the test run and passed?	-	Go to Step 20	Go to Step 2
20	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