P0976
DTC P0976 or P0977Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- 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
Diagnostic Fault Information
Typical Scan Tool Data
Shift Solenoid Valve 2 Control Circuit High Voltage Test Status
Shift Solenoid Valve 2 Control Circuit Open Test Status
Shift Solenoid Valve 2 Control Circuit Low Voltage Test Status
Circuit/System Description
The shift solenoid (SS) 2 is part of the control solenoid valve assembly, which has no serviceable components. SS 2 is a normally closed (NC) ON/OFF solenoid and is controlled by the transmission control module (TCM) through a low side driver. When the SS 2 is energized, ON, SS 2 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. The current to SS 2 is supplied by the TCM 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
P0976
- The engine speed is 400 RPM or greater for 5 seconds.
- The ignition voltage is 8.6 volts or greater.
- DTC P0976 is not set.
P0977
- The engine speed is 400 RPM or greater for 5 seconds.
- The ignition voltage is 8.6 volts or greater.
- DTC P0977 is not set.
Conditions for Setting the DTC
P0976
The TCM detects a short to ground on the SS 2 control circuit for 2 seconds.
P0977
The TCM detects an open or short to power on the SS 2 control circuit for 2 seconds.
Action Taken When the DTC Sets
P0976
- DTC P0976 is a Type B DTC.
- The TCM freezes transmission adaptive functions.
- The TCM commands maximum line pressure.
P0977
- DTC P0977 is a Type A DTC.
- The TCM limits the transmission to Reverse and 5th gear operation.
- The TCM inhibits the torque converter clutch (TCC).
- The TCM commands maximum line pressure.
- The TCM freezes transmission adaptive functions.
- The TCM turns the HSD OFF.
- The TCM inhibits Tap Up/Down function.
- The TCM inhibits manual shifting of forward gears.
Conditions for Clearing the DIC/DTC
- DTC P0976 is a Type B DTC.
- DTC P0977 is a Type A DTC.
Reference Information
Connector End View Reference
- Component Connector End Views
- Inline Harness Connector End Views
Description and Operation
Transmission General Description
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
DT-47825-20 Adapter Harness
For equivalent regional tools, refer to Special Tools.
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 seconds and then idle the vehicle in Park for 5 seconds. Verify with a scan tool the following test status parameters displays OK:
- Shift Solenoid Valve 2 Control Circuit High Voltage Test Status
- Shift Solenoid Valve 2 Control Circuit Open Test Status
- Shift Solenoid Valve 2 Control Circuit Low Voltage Test Status
3. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the conditions for running fault codes (DTC). You may also operate the vehicle within the conditions you observe from the freeze frame/failure records. If the vehicle passes the circuit/system verification procedure, then stop. Do not perform the circuit/system test or component test as this may result in unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections.
Circuit/System Testing
1. Note
You must perform the Circuit/System Verification first.
Remove control solenoid valve assembly Q8 with ignition OFF. See Replacing control solenoid valve assembly and transmission control module.
2. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection. Control Solenoid Valve and Transmission Control Module Assembly Inspection
3. Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
4. Connect the DT-47825-20 harness between the vehicle wire harness X1 20-way transmission electrical connector, and the Q8 control solenoid valve assembly electrical connector.
5. Ignition ON, verify with a scan tool the following test status parameters display OK:
- Shift Solenoid Valve 2 Control Circuit High Voltage Test Status
- Shift Solenoid Valve 2 Control Circuit Open Test Status
- Shift Solenoid Valve 2 Control Circuit Low Voltage Test Status
- If any test status parameter displays Fault or Malfunction, replace the Q8 control solenoid valve assembly.
Repair Instructions
Note
- Perform the Transmission Adaptive Values Learn following all transmission related repairs. Programming and Relearning
- Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection. Control Solenoid Valve and Transmission Control Module Assembly Inspection
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for control solenoid valve assembly replacement, setup, and programming