GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2008 🢒 G6 🢒 DTC 🢒 DTC P2723 or P2724

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 P2723:  Clutch Pressure Control (PC) Solenoid 5 - Stuck Off

DTC P2724:  Clutch Pressure Control (PC) Solenoid 5 - Stuck On

Circuit/System Description

The clutch pressure control (PC) solenoid 5 is part of the control solenoid (w/body and TCM) valve assembly and is not serviced separately. The clutch PC solenoid 5 flows fluid to the 1-2-3-4 clutch when commanded ON and exhausts fluid when commanded OFF. The clutch PC solenoid 5 regulates the transmission fluid pressure to the 1-2-3-4 clutch. The TCM calculates gear ratio based on data from the automatic transmission input speed sensor (ISS) and the output speed sensor (OSS). The TCM compares the expected transmission gear ratio to the calculated gear ratio for each commanded gear.

Conditions for Running the DTC

P2723

    • No ISS DTCs P0716 or P0717.
    • No OSS DTCs P0722 or P0723.
    • No IMS DTCs P1825 or P1915.
    • The transmission input shaft speed is 60 RPM or greater.
    • 1-2-3-4 clutch is commanded ON.

P2724

    • No ISS DTCs P0716 or P0717.
    • No OSS DTCs P0722 or P0723.
    • No IMS DTCs P1825 or P1915.
    • The transmission output shaft speed is 200 RPM or greater.
    • 1-2-3-4 clutch is commanded OFF.

Conditions for Setting the DTC

P2723

The TCM detects an incorrect on-coming clutch gear ratio, or flare, when the 1-2-3-4 clutch is commanded ON and either fail case below is achieved:

Fail Case 1

    • The Commanded gear is 1st.
    • Output shaft speed is greater than 60 RPM.
    • The transmission input shaft speed is 100 RPM or greater from the anticipated input shaft speed for 5 seconds or greater.

Fail Case 2

    • The commanded gear is 2nd.
    • Output shaft speed is less than 60 RPM.
    • The transmission input shaft speed is greater than 75 RPM from the anticipated input shaft speed for 4 seconds or greater.

P2724

The TCM detects an incorrect off-going clutch gear ratio, or tie-up, when the 1-2-3-4 clutch is commanded OFF and the following is achieved:

    • The 1-2-3-4 clutch commanded pressure is 0 kPa for a calculated amount of time.
    • The transmission input shaft speed is 40 RPM or less from the anticipated input shaft speed for 1.2 seconds or greater.

Action Taken When the DTC Sets
    • DTCs P2723 and P2724 are Type A DTCs.
    • The TCM freezes transmission adaptive functions.
    • The TCM commands maximum line pressure.
    • The TCM inhibits TCC.
    • DTC P2723 defaults to Reverse, Park, Neutral, 5th, or 6th gear.
    • DTC P2724 defaults to Reverse, Park, Neutral, 1st, or 2nd gear.

Conditions for Clearing the DIC/DTC

DTCs P2723 and P2724 are Type A DTCs.

Reference Information

Description and Operation

Transmission General Description

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825 Control Solenoid Test Plate

Circuit/System Verification
  1. Verify that DTC P0722 or P0723 is not set.
    2. ⇒If either DTC is set, refer to DTC P0722 or P0723.
  2. Verify that DTC P0756 is not set.
    3. ⇒If the DTC is set, refer to DTC P0756
  3. Perform the Transmission Fluid Check to verify correct fluid level and condition. The transmission fluid level should be within the crosshatch band and the transmission fluid should be red or dark brown.
    4. ⇒If the transmission fluid is low or discolored, refer to Transmission Fluid Replacement.
  4. Engine idling at operating temperature. Attempt to clean or free up a potential sticking valve with the scan tool Service Cleaning Procedure. Refer to Control Solenoid Valve and Transmission Control Module Assembly Cleaning for further instructions.
  5. Operate the vehicle in drive with the calculated throttle position greater than 15 percent to obtain 72 km/h (45 mph) and achieve 5th gear. Perform this maneuver 2 times. The DTCs should not set.
  6. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing
  1. Ignition OFF, remove the line pressure test hole plug and install the J 21867 to the transmission.
  2. Perform the Line Pressure Check. Verify the transmission line pressure gage is within the range specified in the Line PC Solenoid Valve Pressure table. Refer to Solenoid Valve Pressure.
    3. ⇒If not within the specified range, refer to Fluid Pressure High or Low for further diagnosis.
  3. Ignition OFF, remove the control solenoid (w/body and TCM) valve assembly.
  4. Install the DT-47825 to the control solenoid (w/body and TCM) valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test for detailed instructions.
  5. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test. A pressure change should occur.
    6. ⇒If a pressure change does not occur, replace the control solenoid (w/body and TCM) valve assembly.
  6. Inspect for the following conditions and repair/replace as necessary:
    7. • Lower control valve body for a stuck valve, debris or damage
    • 1-2-3-4 clutch assembly for damage

Repair Instructions

Important: 

   • Perform the Service Fast Learn Adapts following all transmission related repairs.
   • Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Control Valve Lower Body and Upper Body Replacement.
    •  Low and Reverse Clutch and 1-2-3-4 Clutch Plate Removal.
    •  Control Module References for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming