Test Description

WARNING: This page is about a different car, the 2007 GMC Yukon XL and 2007 Chevrolet Suburban. 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 verifies that the fault is present.
3: This step tests the transmission wiring harness and the PC solenoid valve for correct resistance.
9: This step begins diagnosis of the engine side of the circuit.

DTC P0961

Step	Action	Value	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. Start the engine. IMPORTANT: Before clearing the DTCs, use the scan tool in order to record the Failure Records for reference. Using the Clear Info function will erase the stored Failure Records from the TCM. Record the Failure Records. Clear the DTCs. With the scan tool, command several values of solenoid reference current from 0.1 amp through 1.1 amp and observe the scan tool display. Does the PC Sol. Actual Current reading vary from the PC Sol. Ref. Current reading by more than the specified amount?	0.16 amp	Go to Step 3	Go to Testing for Intermittent Conditions and Poor Connections
3	Turn OFF the ignition. Disconnect the transmission 20-way connector, additional DTCs may set. Connect the J 44152 jumper harness to the transmission side of the 20-way connector. Using the J 35616 GM-approved terminal test kit, connect a DMM between the PC solenoid valve high control circuit and low control circuits of the J 44152 . See Special Tools . Refer to Automatic Transmission Inline 20-Way Connector End View . Measure the resistance of the PC solenoid valve. Does the resistance measure within the specified range?	3-7 Ω	Go to Step 7	Go to Step 4
4	Is the resistance greater than the specified value?	7 Ω	Go to Step 5	Go to Step 6
5	Test the high control circuit of the PC solenoid valve for an open between the AT inline 20-way connector and the PC solenoid valve. Test the low control circuit of the PC solenoid valve for an open between the AT inline 20-way connector and the PC solenoid valve. Refer to Testing for Continuity . Did you find the condition?	-	Go to Step 15	Go to Step 14
6	Test the high control circuit and the low control circuit of the PC solenoid valve for a short together between the AT inline 20-way connector and the PC solenoid valve. Refer to Circuit Testing . Did you find the condition?	-	Go to Step 15	Go to Step 14
7	Test the high control circuit of the PC solenoid valve for a short to the transmission case between the AT inline 20-way connector and the PC solenoid valve. Test the high control circuit of the PC solenoid valve for a short to other power and ground circuits in the transmission harness. Test from the PC solenoid valve high control circuit to all other terminals in the transmission 20-way connector. Refer to Automatic Transmission Inline 20-Way Connector End View and Circuit Testing .Did you find the condition?	-	Go to Step 15	Go to Step 8
8	Test the low control circuit of the PC solenoid valve for a short to the transmission case between the AT inline 20-way connector and the PC solenoid valve. Test the low control circuit of the PC solenoid valve for a short to other power and ground circuits in the transmission harness. Test from the PC solenoid valve low control circuit to all other terminals in the transmission 20-way connector. Refer to Automatic Transmission Inline 20-Way Connector End View and Circuit Testing .Did you find the condition?	-	Go to Step 15	Go to Step 9
9	Disconnect the from the transmission side of the 20-way connector. Reconnect the 20-way connector. Disconnect the TCM connector. Using the DMM, measure the resistance between the PC solenoid valve high control and low control circuits of the TCM harness connector. Does the resistance measure within the specified range?	3-7 Ω	Go to Step 13	Go to Step 10
10	Does the resistance measure greater than the specified value?	7 Ω	Go to Step 11	Go to Step 12
11	Test the high control circuit of the PC solenoid valve for an open between the TCM and the AT inline 20-way connector. Test the low control circuit of the PC solenoid valve 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 17	-
12	Test the high control circuit and the low control circuit of the PC solenoid valve for a short together 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 17	-
13	Test the high control circuit of the PC solenoid valve for a short to ground or short to voltage between the TCM and the AT inline 20-way connector. Test the low control circuit of the PC solenoid valve for a short to ground or short to voltage 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 17	Go to Step 16
14	Replace the pressure control solenoid valve. Refer to Valve Body and Pressure Switch Replacement . Did you complete the replacement?	-	Go to Step 17	-
15	Replace the automatic transmission wiring harness assembly. Refer to Valve Body and Pressure Switch Replacement . Did you complete the replacement?	-	Go to Step 17	-
16	Replace the TCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	-	Go to Step 17	-
17	Perform the following procedure in order to verify the repair: Select DTC. Select Clear Info. Start the engine. The PC solenoid valve actual current must be between 0.1 and 1.1 amps. Select Specific DTC. Enter DTC P0961. Has the test run and passed?	-	Go to Step 18	Go to Step 2
18	With a 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