GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2009 🢒 SLS 🢒 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 known transmission gear ratio to a calculated gear ratio for each commanded gear.

Conditions for Running the DTC

P2723

Dynamic testing:

    • High Speed Mode:
       - The transmission output shaft speed is greater than or equal to 60 RPM.
       - Commanded gear slip is equal to or greater than 100 RPM for 2.25 seconds.
    • Low Speed Mode:
       - The transmission output shaft speed is less than 60 RPM.
       - The turbine speed is greater than or equal to the calibrated value for 2.25 seconds.

For first gear steady state testing:

    • Active the ignition voltage.
    • DTCs P0716, P0717, P0722, P0723, P1915, P1825 are not set.
    • Active the high side driver.
    • The drive wheel speed is greater than or equal to 80 RPM.
    • The deviation of two wheel speeds at either side is less than or equal to 150 RPM.
    • The average deviation of the drive wheel and the driven wheel is less than 7 percent which could take up to 6 seconds.
    • The transmission is in 1st, 2nd, 3rd or 4th gear.

For 2nd gear steady state testing:

    • Active the ignition voltage.
    • DTCs P0716, P0717, P0722, P0723, P1915, P1825 are not set.
    • Active the high side driver.
    • The drive wheel speed is greater than or equal to 80 RPM.
    • The deviation of two wheel speeds at either side is less than or equal to 150 RPM.
    • The average deviation of the drive wheel and the driven wheel is less than 7 percent which could take up to 6 seconds.
    • The transmission is in 1st, 2nd, 3rd or 4th gear.

For 3rd gear steady state testing:

    • Active the ignition voltage.
    • DTCs P0716, P0717, P0722, P0723, P1915, P1825 are not set.
    • Active the high side driver.
    • The drive wheel speed is greater than or equal to 80 RPM.
    • The deviation of two wheel speeds at either side is less than or equal to 150 RPM.
    • The average deviation of the drive wheel and the driven wheel is less than 7 percent which could take up to 6 seconds.
    • The transmission is in 1st, 2nd, 3rd or 4th gear.

For 4th gear steady state testing:

    • Active the ignition voltage.
    • DTCs P0716, P0717, P0722, P0723, P1915, P1825 are not set.
    • Active the high side driver.
    • The drive wheel speed is greater than or equal to 80 RPM.
    • The deviation of two wheel speeds at either side is less than or equal to 150 RPM.
    • The average deviation of the drive wheel and the driven wheel is less than 7 percent which could take up to 6 seconds.
    • The transmission is in 1st, 2nd, 3rd or 4th gear.

P2724

Dynamic testing:

    • The Transmission Fluid Temperature (TFT) is greater than or equal to 0°C (32°F).
    • DTCs P0716, P0717, P0722, P0723, P1815, P1820, P1822, P1823, P1825, P1826 are not set.
    • The transmission output shaft speed is greater than 200 RPM.
    • The turbine speed is greater than or equal to 200 RPM, 1-2-3-4-R clutch is commanded OFF.

For steady state testing:

    • Active the ignition voltage.
    • The Transmission Fluid Temperature (TFT) is greater than or equal to 0°C (32°F).
    • DTCs P0716, P0717, P0722, P0723, P1915, P1825 are not set.
    • Active the high side driver.
    • With the brake pedal not depressing or gear torque varies exceeds 250 N·m (184 lb ft) in 0.35 seconds.
    • The drive wheel speed is greater than or equal to 80 RPM.
    • The deviation of two wheel speeds at either side is less than or equal to 150 RPM.
    • The average deviation of the drive wheel and the driven wheel is less than 7 percent which could take up to 6 seconds.
    • The change of the transmission output shaft speed is greater than 1,300 RPM per second.
    • Commanded gear equals 5th or 6th and has obtained a gear ratio.

Conditions for Setting the DTC

P2723

Dynamic Test:

    • The Transmission Fluid Temperature (TFT) is greater than or equal to 0°C (32°F).
    • DTCs P0716, P0717, P0722, P0723, P1815, P1820, P1822, P1823, P1825, P1826 are not set.
    • The turbine speed is greater than or equal to 60 RPM, 1-2-3-4-R clutch is commanded ON.

The first gear steady state testing:

Fail Case 1 and Fail Case 2 must occur in sequential order.

    • Fail Case 1
    • Output shaft speed is greater than 60 RPM.
    • The transmission input shaft speed is greater than 75 RPM from the anticipated input shaft speed.

Fail Case 2

    • Output shaft speed is less than 60 RPM.
    • The transmission input shaft speed is greater than 75 RPM from the anticipated input shaft speed.

P2724

Dynamic Test:

    • As PCS 5 of 1-2-3-4-R clutch commanded pressure is 0 for a calibrated amount of time.
    • The abyained gear box slip is equal to or less than 40 RPM for a calibrated amount of time.

Steady state test:

Fail Case 1 and Fail Case 2 must occur in sequential order, and the transmission is not at 1st, 2nd, 3rd, or 4th gear.

    • Fail Case 1
       - The transmission OSS speed drops less than or equal to a calibrated value.
       - The above conditions exist forup to 0.3 seconds
    • Fail Case 2
        The clutch is off going and the difference of the gear speed is between 35 and 100 RPM for 4 seconds.

Action Taken When the DTC Sets
    • DTCs P2723 and P2724 are type A DTCs.
    • The TCM freezes transmission adaptive functions.
    • 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.

Diagnostic Aids

When attempting to set transmission performance DTCs, observe the Freeze Frame and Failure Records to assist in duplicating the failure conditions.

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

Special Tools

    • DT-47825 Control Solenoid Test Plate
    • DT-47825-10 Jumper Harness

Circuit/System Verification
  1. Perform the Transmission Fluid Check.
  2. Turn ON the ignition, with the engine OFF.

    3. Note: Before clearing the DTC, use the scan tool in order to record the Freeze Frame and Failure Records.

  3. Record the DTC Freeze Frame and Failure Records.
  4. Clear the DTC.
  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.
    6. ⇒If the DTC resets, go to Circuit/System Testing.

Circuit/System Testing
  1. Perform the Line Pressure Check.
    2. ⇒If the pressure is out of specification, correct this concern first.
  2. Perform the Control Solenoid Valve and Transmission Control Module Assembly Cleaning and retest the DTC as outlined in the Circuit/System Verification steps.
    3. ⇒If the DTC resets, continue on with testing.
  3. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection.
    4. ⇒If a concern is found, repair or replace the control solenoid (w/body and TCM) valve assembly.
  4. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test.
    5. ⇒If the solenoid is found to be leaking or stuck closed, replace the control solenoid (w/body and TCM) valve assembly.
  5. Inspect the control valve lower body assembly for sticking valves, damage, scored bores, or debris.
    6. ⇒If a concern if found in the valve body, repair or replace the valve body as necessary.
  6. Inspect the 1-2-3-4 clutch assembly for damage.
    7. ⇒If a concern is found in the 1-2-3-4 clutch assembly, repair or replace as necessary.

Component Testing

Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection.

PC Sol 5 Operation

Operating Conditions

Normal Operation

Stuck OFF

Stuck ON

Steady State Gears 1, 2, 3, 4

1, 2, 3, 4

Neutral

1, 2, 3, 4

Steady State Gears 5, 6

5, 6

5, 6

1, 2, 3, 4

Garage Shift

Park/Neutral/Reverse to Drive

Neutral

Drive Gear

Downshift from gears 5, 6 to 1, 2, 3, 4

1, 2, 3, 4

Neutral

1, 2, 3, 4

Upshift from gears 1, 2, 3, 4 to 5, 6

5, 6

5, 6

1, 2, 3, 4

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Control Valve Lower Body and Upper Body Replacement
    •  1-2-3-4 and 3-5 Reverse Clutch Assembly and 4-5-6 Clutch Assembly Removal.
    •  Service Fast Learn Adapts
    •  Control Module References for TCM replacement, setup, and programming