P0976
DTC P0976
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 1 voltage circuit. The transmission control module (TCM) controls the solenoid by providing the ground path on the 2-3 SS valve control circuit.
When the TCM 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 run time is greater than 5 seconds.
^ The 1-2 SS is commanded ON.
Conditions for Setting the DTC
DTC P0973 sets when either of the following conditions occurs for 4.3 seconds:
^ The TCM detects an open in the 1-2 shift solenoid valve circuit when the 1-2 SS is commanded ON.
^ The TCM 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 TCM requests the ECM to illuminate the malfunction indicator lamp (MIL).
^ The TCC commands maximum line pressure.
^ The TCM inhibits 3-2 shift if vehicle speed is less than 40 km/h (25 mph).
^ The TCM freezes transmission adaptive functions.
^ At the time of the first failure, the TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM 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 TCM stores DTC P0973 in TCM history.
Conditions for Clearing the MIL/DTC
^ The ECM turns OFF the MIL after the 4th consecutive drive trip in which the TCM does not send a MIL illumination request.
^ A scan tool can clear the MIL/DTC.
^ The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission related diagnostic fault occurring.
^ The TCM cancels the default actions when the ignition is OFF long enough in order to power down the TCM.
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 TCM 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.
