P0976
DTC P0976 or P0977
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 P0976
- Shift Solenoid Valve 2 Control Circuit Low Voltage
DTC P0977
- Shift Solenoid Valve 2 Control Circuit High Voltage
Circuit/System Description
Shift solenoid 2 is part of the control solenoid valve assembly, which has no serviceable components. Shift solenoid 2 is a normally closed ON/OFF solenoid and is controlled by the transmission control module (TCM) through a low side driver. When the shift solenoid 2 is energized, fluid pressure is directed to the clutch select valve 3, which allows the valve to overcome the spring pressure and move to the applied position. Power to the shift solenoid 2 is supplied by the TCM through a high side driver. The high side driver protects the circuit and components from excessive current flow. If excessive current flow is detected, the high side driver will turn OFF. When the fault is corrected, the high side driver will reset.
Conditions for Running the DTC
P0976
* DTC P0976 is not set.
* Engine speed is 400-7500 RPM for 5 s.
* Ignition voltage is 8.6-32 V.
P0977
* DTC P0977 is not set.
* Engine speed is 400-7500 RPM for 5 s.
* Ignition voltage is 8.6-32 V.
Conditions for Setting the DTC
P0976
TCM detects a short to ground on the shift solenoid 2 control circuit for 2 s.
P0977
TCM detects an open or short to power on the shift solenoid 2 control circuit for 2 s.
Action Taken When the DTC Sets
P0976
* DTC P0976 is a Type C DTC.
* TCM freezes transmission adaptive functions.
P0977
* DTC P0977 is a Type A DTC.
* TCM limits the transmission to Reverse and 3rd gear operation.
* TCM commands maximum line pressure.
* TCM freezes transmission adaptive functions.
* TCM inhibits Tap Up/Down function
* TCM inhibits manual shifting of forward gears
Conditions for Clearing the DTC
* DTC P0976 is a Type C DTC.
* DTC P0977 is a Type A DTC.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics Electrical Diagrams
Connector End View Reference
* Component Connector End Views Fuel Pump and Level Sensor Assembly
* Inline Harness Connector End Views X105
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-47825-20 - Adapter Harness
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Circuit/System Verification
1. Operate the vehicle in 3rd gear long enough to ensure at least a 3°C (5°F) rise in TCM temperature.
2. Place the gear selector in Reverse for 5 s and then idle the engine with the gear selector in Park for 5 s.
3. Verify the scan tool parameters listed below do not display Malfunction:
* Shift Solenoid Valve 2 Control Circuit Low Voltage Test Status
* Shift Solenoid Valve 2 Control Circuit Open Test Status
* Shift Solenoid Valve 2 Control Circuit High Voltage Test Status
• If Malfunction is displayed
Refer to Circuit/System Testing.
• If Malfunction is not displayed
4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
5. Verify the DTC does not set.
• If the DTC sets
Refer to Circuit/System Testing.
• If the DTC does not set
6. All OK.
Circuit/System Testing
Note: You must perform the Circuit/System Verification first.
1. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.
2. Verify the Q8 Control Solenoid Valve Assembly is not contaminated with any debris and clean as necessary. Refer to Control Solenoid Valve and Transmission Control Module Assembly Inspection Control Solenoid Valve and Transmission Control Module Assembly Inspection.
• If contaminated
Repair as necessary.
• If not contaminated
3. Verify the resistance is within the specified range for each solenoid listed in the Control Solenoid Valve and Transmission Control Module Assembly Inspection Control Solenoid Valve and Transmission Control Module Assembly Inspection.
• If the resistance is not within range
Replace the Q8 Control Solenoid valve Assembly.
• If the resistance is within range
4. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
5. Connect the DT-47825-20 - adapter harness between the vehicle harness connector, and the Q8 Control Solenoid Valve Assembly connector. Ignition ON.
6. Verify the scan tool parameters listed below do not display Malfunction:
* Shift Solenoid Valve 2 Control Circuit Low Voltage Test Status
* Shift Solenoid Valve 2 Control Circuit Open Test Status
* Shift Solenoid Valve 2 Control Circuit High Voltage Test Status
• If Malfunction is displayed
Replace the Q8 Control Solenoid Valve Assembly.
• If Malfunction is not displayed
7. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repairs.
* Perform the Reset Transmission Adapts Reset Procedure following all transmission repairs.
* Control Solenoid Valve and Transmission Control Module Assembly Replacement Service and Repair.
* Control Module References Control Module References for control solenoid valve assembly replacement, programming, and setup.