For 1990-2009 cars

### Diagnostic 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 (SS) 2 Control Circuit Low Voltage
DTC P0977: Shift Solenoid (SS) 2 Control Circuit High Voltage

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Shift Solenoid (SS) 2 Control | P0976 | P0977 | P0977 | --
Shift Solenoid (SS) 2 High Side Driver 2 | P1833 | P1833 | P1834 | --

### Typical Scan Tool Data

#### Shift Solenoid (SS) 2

Circuit | Short to Ground | Open/High Resistance | Short to Voltage
--- | --- | --- | ---
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: OK
Shift Sol. 2 CKT Status | Short to GND | Open | Short to Voltage
High Side Driver 2 CKT Status | Open/Short to GND | Open/Short to GND | Short to Voltage

#### Typical Scan Tool Data

Circuit | Normal Circuit Voltage | Scan Data - Circuit Open | Scan Data - Circuit Grounded | Scan Data - Circuit Shorted to Voltage
--- | --- | --- | --- | ---
Shift Sol. 2 circuit Status | Operational | Open | Short to Ground | Shorted to Voltage
High Side Driver 2 Circuit Status | Operational | Open/Short to GND | Open/Short to GND | Shorted to Voltage

### Circuit/System Description

The shift solenoid (SS) 2 is part of the control solenoid (w/body and TCM) valve assembly and is not serviced separately. The TCM supplies 12 volts to SS 2 on the high side driver 2 circuit. The TCM controls the normally closed SS 2 on the SS 2 control circuit. The SS 2 controls the transmission fluid to the Mode-3 valve. In the ON position the 4-5-6 clutch is fed by drive fluid. In the OFF position, Reverse fluid is allowed to flow and is supplied to the low and reverse clutch and the 4-5-6 clutch assemblies.

### Conditions for Running the DTC

#### P0976

• | DTC P0976 is not set.

• | Start the ignition voltage, run the engine.

#### P0977

• | DTC P0977 is not set.

• | Start the ignition voltage, run the engine.

### 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 300 milliseconds.

• | Last for 1.2 seconds in the 1.5 seconds sample time.

#### P0977

• | The TCM detects an internal high voltage electrical malfunction of the SS 2 control circuit when the SS 2 is commanded ON for 300 milliseconds.

• | Last for 1.2 seconds in the 1.5 seconds sample time.

### Action Taken When the DTC Sets

• | DTC P0976 is a type B DTC.

• | The TCM defaults the transmission to 3rd gear if the current gear is 1st, 2nd, or 3rd, or 5th gear if the current gear is 4th, 5th, or 6th gear.

• | The TCM inhibits the torque converter clutch (TCC).

• | The TCM commands maximum line pressure.

• | The TCM freezes transmission adaptive functions.

### Conditions for Clearing the DIC/DTC

• | DTC P0976 is a type B DTC.

• | DTC P0977 is a type A DTC.

### Diagnostic Aids

When attempting to set solenoid electrical DTCs, ensure the TCM is warmed up and the transmission is operated in 2nd gear long enough to ensure a 3°C (5°F) increase in TCM substrate temperature. This will place the TCM under the optimal conditions to test solenoid electrical DTCs.

### Reference Information

#### Schematic Reference

Automatic Transmission Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### DTC Type Reference

• | Diagnostic Trouble Code (DTC) Type Definitions

• | Diagnostic Trouble Code (DTC) List/Type

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

• | Scan Tool Output Controls

• | Scan Tool Data List

• | Scan Tool Data Definitions

### Circuit/System Testing

1. Ensure the transmission fluid temperature is between 50-80°C (122-176°F).
2. Operate the vehicle in 4th, 5th, or 6th gear with TCC applied, long enough to ensure at least a 3°C (5°F) rise in TCM substrate temperature.
3. Observe the scan tool data parameter Shift Sol. 2 CKT Status. The parameter should display OK.

⇒ | If the parameter displays Open, Short to Volts, Short to GND, or if the DTC resets, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection.

⇒ | If no concerns are found during the inspection, replace the control solenoid (w/body and TCM) valve assembly.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Service Fast Learn Adapts

• | Control Module References for TCM replacement, setup, and programming