P0977
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 (SS) 2 Control Circuit Low Voltage
DTC P0977
-
Shift Solenoid (SS) 2 Control Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The shift solenoid (SS) 2 is part of the control solenoid valve assembly which has no serviceable parts. SS 2 is a normally closed (NC) ON/OFF solenoid and is controlled by the 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. Power to the 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 or P0977
* DTCs P0976 or P0977 have not set this ignition.
* The ignition voltage is 8.6 volts or greater
* The engine speed is 400 RPM or greater for 5 seconds.
* The SS 2 is commanded ON or OFF.
Conditions for Setting the DTC
P0976
The TCM detects an internal low voltage electrical malfunction of the SS 2 control circuit when the SS 2 is commanded OFF for 2 seconds.
P0977
The TCM detects an internal high voltage electrical malfunction of the SS 2 control circuit when the SS 2 is commanded ON for 2 seconds.
Action Taken When the DTC Sets
P0976
* DTC P0976 is a Type B DTC.
* The TCM defaults the transmission to 3rd gear or reverse gear.
* The TCM forces the torque converter clutch (TCC) OFF.
* The TCM commands maximum line pressure.
* The TCM freezes transmission adaptive functions.
* The TCM enables Torque Management.
* The TCM inhibits TAP Up/Down function.
* The TCM inhibits manual shifting of forward gears.
P0977
* DTC P0977 is a Type A DTC.
* The TCM inhibits 1st gear.
* The TCM freezes transmission adaptive functions
* The TCM enables Torque Management
* 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
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 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
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
• If any test status parameter displays Fault or Malfunction
Refer to Circuit/System Testing below.
• If all test status parameters display OK
3. 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, remove the Q8 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement Service and Repair.
2. Inspect the Q8 control solenoid valve and transmission control module assembly. The Q8 control solenoid valve and transmission control module 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 and transmission control module 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.
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
* Perform the Reset Transmission Adapts Reset Procedure following all transmission related repairs.
* Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection Control Solenoid Valve and Transmission Control Module Assembly Inspection.
* Control Module References Control Module References for control solenoid valve assembly replacement, programming, and setup.