P0971
DTC P0969-P0971
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 Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0969
- Pressure Control (PC) Solenoid 3 System Performance
DTC P0970
- Pressure Control (PC) Solenoid 3 Control Circuit Low Voltage
DTC P0971
- Pressure Control (PC) Solenoid 3 Control Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The pressure control (PC) solenoid 3 is part of the control solenoid valve assembly which has no serviceable parts. The normally high PC solenoid 3 regulates and directs the PC solenoid 3 oil pressure to the 4-5-6 clutch regulator valve and 4-5-6 clutch boost valve. Increasing PC solenoid 3 oil pressure increases oil pressure to the 4-5-6 clutch assembly. The Transmission Control Module varies the current to the PC solenoid 3 through a low side driver. Decreasing the current to the PC solenoid 3 increases PC solenoid 3 oil pressure by closing OFF the solenoid exhaust port. Increasing the current to the PC solenoid 3, decreases PC solenoid 3 oil pressure by opening the solenoid exhaust port. PC solenoid 3 power is supplied by the Transmission Control Module through a high side driver (HSD). The HSD protects the circuit and components from excessive current flow. If excessive current flow is detected, the HSD will turn OFF. When the fault is corrected the HSD will reset.
Conditions for Running the DTC
P0969, P0970, or P0971
* DTC P0969, P0970, or P0971 is not set.
* The ignition voltage is between 8.6-32 V.
* The engine speed is between 400-7500 RPM for 5 seconds.
* The clutch PC solenoid 3 is commanded ON.
Conditions for Setting the DTC
P0969
The Transmission Control Module detects an internal electrical malfunction on the PC solenoid 3 control circuit where the measured PC solenoid 3 current does not equal the commanded clutch PC solenoid 3 current for 5 seconds.
P0970
The Transmission Control Module detects a short to ground on the PC solenoid 3 control circuit for 1 second.
P0971
The Transmission Control Module detects an open or short to voltage on the PC solenoid 3 control circuit for 1 second.
Action Taken When the DTC Sets
P0969
* DTC P0969 is a Type C DTCs.
* The TCM freezes transmission adaptive functions.
P0970
* DTC P0970 is a Type A DTC.
* The TCM defaults the transmission to a limited shift pattern utilizing 2 forward gears and reverse gear based on the default detected.
* The TCM forces HSD1 OFF.
* The TCM forces TCC OFF.
* The TCM freezes transmission adaptive functions.
* The TCM commands maximum line pressure.
* The TCM enables Torque management.
* The TCM inhibits TAP Up/Down function.
P0971
* DTC P0971 is a Type A DTC.
* The TCM defaults the transmission to a limited shift pattern utilizing 2 forward gears and reverse gear based on the default detected.
* The TCM forces TCC OFF.
* The TCM freezes transmission adaptive functions.
* The TCM commands maximum line pressure.
* The TCM enables Torque management.
* The TCM inhibits TAP Up/Down function.
* The TCM inhibits manual shifting of forward gears.
Conditions for Clearing the DTC
* DTC P0969 is a Type C DTCs.
* DTCs P0970 and P0971 are Type A DTCs.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics Electrical Diagrams
Connector End View Reference
* Component Connector End Views 5 Bow Lowered Switch (CM7)
* Inline Harness Connector End Views X102
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 References for scan tool information
Special Tools
DT-47825-10 - Jumper Harness
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Circuit/System Verification
1. Operate the vehicle in drive range. Allow the vehicle to shift through all forward gear ranges.
2. Verify with a scan tool the following test status parameters display OK:
* Pressure Control Solenoid Valve 3 Performance Test Status
* Pressure Control Solenoid Valve 3 Control Circuit High Voltage Test Status
* Pressure Control Solenoid Valve 3 Control Circuit Low Voltage Test Status
• If Malfunction is displayed
Refer to Circuit/System Testing.
• If Malfunction is not displayed
3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
4. Verify the DTC does not set.
• If the DTC sets
Refer to Circuit/System Testing.
• If the DTC does not set
5. All OK.
Circuit/System Testing
Note: You must perform the Circuit/System Verification first.
1. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement Service and Repair.
2. Verify and inspect the Q8 Control Solenoid Valve Assembly. The Q8 Control Solenoid Valve Assembly must be externally cleaned of all debris and each solenoid resistance value must be within the specified range. Refer to Control Solenoid Valve and Transmission Control Module Assembly Inspection Control Solenoid Valve and Transmission Control Module Assembly Inspection.
• If the solenoid resistance is not within the specified ranges
Replace the Q8 Control Solenoid Valve Assembly.
• If the solenoid resistance is within the specified ranges
3. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
4. Connect DT-47825-10 - jumper harness between the vehicle wire harness electrical connector and the Q8 Control Solenoid Valve Assembly electrical connector. Ignition ON.
5. Verify the scan tool parameters do not display Malfunction:
* Pressure Control Solenoid Valve 3 Performance Test Status
* Pressure Control Solenoid Valve 3 Control Circuit High Voltage Test Status
* Pressure Control Solenoid Valve 3 Control Circuit Low Voltage Test Status
• If Malfunction is displayed
Replace the Q8 Control Solenoid Valve Assembly.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Perform the Reset Transmission Adapts Reset Procedure following all transmission related repairs.
* Refer to Control Module References Control Module References for control solenoid valve assembly replacement, programming, and setup.