P0976
DTC P0976 (4.2L)
Circuit Description
The 2-3 shift solenoid (SS) valve controls the fluid flow acting on the 2-3 shift valves. The solenoid is a normally-open exhaust valve. With the 1-2 SS valve, the 2-3 SS valve allows 4 different shifting combinations. The solenoid attaches to the control valve body within the transmission. The 2-3 SS valve receives voltage through the ignition voltage circuit. The powertrain control module (PCM) controls the solenoid by providing the ground path on the 2-3 SS valve control circuit.
When the PCM detects a continuous open, short to ground in the 2-3 SS valve control circuit, then DTC P0976 sets. DTC P0976 is a type A DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0976 2-3 Shift Solenoid (SS) Control Circuit Low Voltage
Conditions for Running the DTC
- The engine speed is greater than 475 RPM for 7 seconds.
- The 2-3 SS is commanded ON.
Conditions for Setting the DTC
DTC P0973 sets when either of the following conditions occurs for 4.3 seconds:
- The PCM detects an open in the 1-2 shift solenoid valve circuit when the 1-2 SS is commanded ON.
- The PCM detects a short to ground in the 1-2 shift solenoid valve circuit when the 1-2 SS is commanded ON.
Action Taken When the DTC Sets
- The PCM requests the ECM to illuminate the malfunction indicator lamp (MIL).
- The PCM inhibits 1st gear.
- The TCC commands maximum line pressure.
- The PCM freezes transmission adaptive functions.
- At the time of the first failure, the PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as a Failure Record.
- At the time of the second failure, the ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as a Freeze Frame.
- The PCM stores DTC P0976 in PCM history.
Conditions for Clearing the MIL/DTC
- The engine control module (ECM) turns OFF the MIL after the third consecutive drive trip in which the PCM does not send a MIL illumination request.
- A scan tool can clear the MIL/DTC.
- The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission related diagnostic fault occurring.
- The PCM cancels the default actions when the ignition is OFF long enough in order to power down the PCM.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
4. This step tests the function of the 2-3 SS valve and the automatic transmission (AT) wiring harness.
5. This step tests for voltage to the 2-3 SS valve from the ignition through the fuse.
6. This step tests the ability of the PCM and the wiring to control the ground circuit.
8. This step measures the resistance of the AT wiring harness and the 2-3 SS valve.
