P0967
DTC P0964-P0967
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructionsprovides an overview of each diagnostic category.
DTC Descriptors
DTC P0964
- Pressure Control (PC) Solenoid 2 Control Circuit Open
DTC P0965
- Pressure Control (PC) Solenoid 2 System Performance
DTC P0966
- Pressure Control (PC) Solenoid 2 Control Circuit Low Voltage
DTC P0967
- Pressure Control (PC) Solenoid 2 Control Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
The Pressure Control Solenoid 2 (PCS2) is a solenoid that controls pressure which is proportional to the current. The transmission fluid pressure from PCS2 is directed to another valve which regulates the transmission fluid flow and pressure through shift valves that allows it to engage different clutches.
The transmission control module (TCM) provides B+ to PCS2 and shift solenoids 1,2, and 3 (SS1, SS2, and SS3) through a separate solid state device called high side driver 2 (HSD2). The TCM uses a low side driver to control the current flow to the PCS2. The TCM controls the current to the solenoid by changing the amount of time that the low side driver is on.
Conditions for Running the DTC
P0964 or P0966
* DTC P2669, P2670, or P2671 is not set.
* Battery voltage is between 9-18 V.
* Engine speed is greater than 200 RPM.
* HSD2 is enabled.
P0965
* DTC P0964, P0966, P2669, P2670, or P2671 is not set.
* Battery voltage is between 9-18 V.
* HSD2 is enabled.
* TCC is commanded fully applied or fully released.
* Range shift is not be in process.
P0967
* DTC P0967, P2669, P2670, or P2671 is not set.
* Battery voltage is between 9-18 V.
* Engine speed is greater than 200 RPM.
* HSD2 is enabled.
Conditions for Setting the DTC
P0964
TCM detects an open circuit on the PCS2 control circuit for 1 second.
P0965
TCM detects the PCS2 current does not equal the commanded PCS2 current for 10 seconds.
P0966
TCM detects a short to ground on the PCS2 control circuit for 1 second.
P0967
TCM detects a short to voltage on the PCS2 circuit for 1 second.
Action Taken When the DTC Sets
P0964, P0965, P0966, or P0967
* DTCs P0964, P0965, P0966, and P0967 are Type A DTCs.
* If the DTC sets while in a forward range, the TCM commands 1st, 3rd or 5th gear. If DTC sets while in REVERSE, the transmission stays in reverse.
Conditions for Clearing the DTC
DTCs P0964, P0965, P0966, and P0967 are Type A DTCs.
Diagnostic Aids
P0964
* You may have to drive the vehicle in order to experience a condition.
* If DTC P0964 is accompanied by DTC P0972, DTC P0975, and/or DTC P0978, the open is most likely in the HSD2 circuit.
P0965, P0966, and P0967
You may have to drive the vehicle in order to experience a condition.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics Electrical Diagrams
Connector End View Reference
* Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
* Inline Harness Connector End Views X100
Description and Operation
* Transmission General Description Transmission General Description
* Transmission Component and System Description Transmission Component and System Description
* Electronic Component Description Electronic Component Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module Referencesfor scan tool information
Circuit/System Verification
1. Ignition ON, engine OFF, command the PC Solenoid 2 ON and OFF with a scan tool. Observe the scan tool PC Sol. 2 Pressure Command parameter. The PC Sol. 2 Pressure Command parameter should change from 1,600 kPa (232 psi) to 0 kPa (0 psi).
• If the parameter does not change between the specified values
Refer to Circuit/System Testing below.
• If the parameter changes between the specified values
2. Clear the TCM DTCs.
3. Perform the Road Test Allison - Automatic Transmission. Verify with a scan tool that DTC P0964, P0965, P0966 or P0967 did not set.
• If DTC P0964, P0965, P0966 or P0967 set
Refer to Circuit/System Testing below.
• If DTC P0964, P0965, P0966 or P0967 did not set
4. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions you observe from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure, then STOP. Do not perform the Circuit/System Testing or Component Testing as this may result in an unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections.
Circuit/System Testing
Note: You must perform the Circuit/System Verification first.
1. Ignition OFF, disconnect the 20-way X175 vehicle harness connector at the transmission.
2. Ignition ON, engine OFF.
3. Verify that a test lamp illuminates between the vehicle harness X175 transmission connector B+ circuit terminal N and ground.
• If the test lamp does not illuminate
1. Ignition OFF, disconnect the 80 way vehicle harness connector at the K71 transmission control module.
2. Test for infinite resistance between the X175 vehicle harness transmission connector B+ circuit terminal N and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohm between the X175 vehicle harness connector B+ circuit terminal N and the vehicle harness transmission control module connector terminal 71.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, replace the K71 transmission control module.
• If the test lamp illuminates
4. Connect a test lamp between the X175 vehicle harness connector pressure control (PC) solenoid valve 2 control circuit terminal P and the B+ circuit terminal N.
5. Command PC Solenoid 2 ON and OFF with a scan tool and verify the PC Sol. 2 Pressure Command parameter changes from 1600 kPa (232 psi) to 0 kPa (0 psi). The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always ON
1. Ignition OFF, disconnect the 80 way vehicle harness connector at the K71 transmission control module.
2. Test for infinite resistance between the X175 vehicle harness transmission connector pressure control (PC) solenoid valve 2 control circuit terminal P and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K71 transmission control module.
• If the test lamp is always OFF
1. Ignition OFF, disconnect the 80 way vehicle harness connector at the K71 transmission control module.
2. Test for less than 2 ohm between the X175 vehicle harness connector pressure control (PC) solenoid valve 2 control circuit terminal P and the vehicle harness transmission control module connector terminal 36.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm
3. Ignition ON.
4. Test for less than 1 volt between the X175 vehicle harness connector pressure control (PC) solenoid valve 2 control circuit terminal P and ground.
• If 1 volt or greater, repair the short to voltage in the circuit.
• If less than 1 volt, replace the K71 transmission control module.
• If test lamp turns ON and OFF
6. Ignition OFF, install the X175 harness connector.
7. Remove the transmission oil pan. Refer to Oil Pan Replacement Service and Repair.
8. Disconnect the Pressure Control (PC) Solenoid Valve 2 connector.
9. Connect a test lamp between the internal harness pressure control (PC) solenoid valve 2 connector B+ circuit terminal 1 and control circuit terminal 2.
10. Ignition ON, engine OFF.
11. Command the PC Solenoid 2 ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp does not turn ON and OFF
Replace the transmission internal wiring harness. Refer to Wiring Harness Replacement Service and Repair.
• If the test lamp turns ON and OFF
12. Ignition OFF, disconnect the 80 way vehicle harness connector at the K71 transmission control module.
13. Test for infinite resistance between the transmission internal connector pressure control (PC) solenoid valve 2 control circuit terminal 2 and ground.
• If less than infinite resistance
Repair the short to ground on the circuit.
• If infinite resistance
14. Test for less than 2 ohm between transmission internal wiring harness pressure control (PC) solenoid valve 2 connector control circuit terminal 2 and the vehicle harness transmission control module connector terminal 36.
• If 2 ohm or greater
Repair the open/high resistance in the circuit.
• If less than 2 ohm
15. Replace the Pressure Control (PC) Solenoid Valve 2.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Wiring Harness Replacement Service and Repair
* Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD) Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD)Control Valve Solenoid Replacement (PCS1 and PCS2) Control Valve Solenoid Replacement (PCS1 and PCS2)
* Control Module References Control Module Referencesfor TCM replacement, programming, and setup.
Repair Verification
If another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure.