P1723

DTC P1723

Circuit Description

Trim A solenoid is used to control on-coming, off-going, and holding pressure to any one of the five clutches. A solenoid is referred to as a pressure proportional to current (PPC) solenoid, since the output hydraulic pressure supplied by this solenoid is proportional to the controlled current command.

The transmission control module (TCM) uses information from the turbine and output speed sensors in order to detect if a clutch is in a tie-up condition or 3 clutches are applied. The clutch being controlled by A solenoid will vary, depending on the shift being made.

DTC P1723 is a type A DTC.

Conditions for Running the DTC

- DTCs P0716, P0717, P0721, P0722, P0875 and P0876 are not active.
- The components are powered and ignition voltage is greater than 9.0 volts and less than 18 volts.
- Output speed is greater than 200 RPM.
- Turbine speed is greater than 200 RPM.

Conditions for Setting the DTC

DTC P1723 sets if the TCM determines an off-going clutch, controlled by A solenoid, remains engaged during a forward range shift.

Action Taken When the DTC Sets

- The TCM illuminates the malfunction indicator lamp (MIL).
- When failure occurs in a forward range, the transmission will go to the previous range. If failure occurs in NEUTRAL or REVERSE, the transmission will lock in NEUTRAL while diagnostic response is active.
- If the shift selector is moved to NEUTRAL, the transmission will shift to NEUTRAL.
- If the shift selector is moved to REVERSE, the transmission will shift to REVERSE or NEUTRAL, or in some cases may lock in NEUTRAL.
- If the shift selector is returned to a forward range and the transmission is compromised by overspeeding or direction change, the transmission will shift to NEUTRAL.
- DTC P1723 will be stored in TCM history.
- The TCM freezes shift adapts.
- The TCM inhibits torque converter clutch (TCC) engagement.

Conditions for Clearing the DTC

A scan tool can clear the code from TCM history. The TCM automatically clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without failure.

Diagnostic Aids

- Inspect the wiring for poor electrical connections at the TCM. Look for the following conditions:
- A bent terminal
- A backed-out terminal
- A damaged terminal
- Poor terminal tension
- A chafed wire
- A broken wire inside the insulation
- When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.
- You may have to drive the vehicle in order to experience a condition.
- This DTC indicates the off-going clutch, being controlled by A solenoid, is not releasing or is slow to release. This could indicate a leak or obstruction in a specific clutch apply circuit. Observe scan tool failure record data for previous or current range information when the DTC was set, in order to determine the specific shift when the DTC was set. Refer to Solenoid and Clutch Chart in order to determine which clutch circuit is suspect.

Important: Clutch failure due to installation of an engine power upgrade is not covered under the manufacturers warranty.

- Inspect for the presence of an add-on engine power package. When engine horsepower or torque is increased over factory rating, a shift flare condition may occur.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

3. This step tests for proper ignition voltage.
4. This step tests for erratic speed sensor readings.
5. This step tests for internal hydraulic leakage.
6. This step tests for clutch capacity.