P2724
DTC P2723 or P2724
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) 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
Diagnostic Fault Information
The following fault table will help determine if a hydraulic circuit or an incorrect position of a valve train component affects the transmission operation.
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. Solenoid power is supplied by the TCM through a high side driver (HSD). The HSD protects the circuits and components that the TCM powers. Should the circuit overload the driver will shutdown. After the overload is removed the HSD reset. 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 DTCs P0716 or P0717
* No DTCs P0722 or P0723
* No DTCs P1825 or P1915
* The transmission input shaft speed is greater than 60 RPM.
* 1-2-3-4 clutch is commanded ON.
P2724
* No DTCs P0716 or P0717
* No DTCs P0722 or P0723
* No DTCs P1825 or P1915
* The transmission input speed is equal to or greater than 200 RPM.
* The transmission output shaft speed is equal to or greater than 200 RPM.
* 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 for 0.5 seconds and either fail case below is achieved:
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
The TCM detects an incorrect off-going clutch gear ratio, or tie-up, when the 1-2-3-4 clutch is commanded OFF for 0.5 seconds 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 less than 40 RPM from the anticipated input shaft speed.
* The output shaft speed is greater than 60 RPM.
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.
Reference Information
Description and Operation
Transmission General Description (Transmission General Description)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Special Tools
* DT-47825 Control Solenoid Test Plate
* DT-47825-10 Jumper Harness
For equivalent regional tools, refer to Special Tools (Tools and Equipment).
Circuit/System Verification
1. Verify that DTC P0722 or P0723 are not set.
• If either DTC is set, refer to DTC P0722 or P0723 (P0722).
2. Verify that DTC P0756 is not set.
• If the DTC is set, refer to DTC P0756 (P0756).
3. Perform the Transmission Fluid Level and Condition Check (Transmission Fluid Level and Condition 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..
• If the transmission fluid is low or discolored, refer to Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement (Removal and 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 (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.
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. Perform the Line Pressure Check (Line Pressure Check). Verify the transmission line pressure gauge is within the range specified in the Line PC Solenoid Valve Pressure table.
• If not within the specified range, refer to Fluid Pressure High or Low (Fluid Pressure High or Low) for further diagnosis.
2. Ignition OFF, remove the control solenoid (w/body and TCM) valve assembly.
3. 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 (Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test) for detailed instructions.
4. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test (Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test). A pressure change should occur.
• If a pressure change does not occur, replace the control solenoid (w/body and TCM) valve assembly.
5. Inspect for the following conditions and repair/replace as necessary:
* Lower control valve body for a stuck valve, debris or damage
* 1-2-3-4 clutch assembly for damage
Repair Instructions
* Perform the Service Fast Learn Adapts (Programming and Relearning) following all transmission related repairs.
* Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection (Control Solenoid Valve and Transmission Control Module Assembly Inspection).
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Control Valve Lower Body and Upper Body Replacement (Service and Repair).
* Control Module References (Programming and Relearning) for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming.
* Low and Reverse Clutch Overhaul (6L50) (Overhaul)Low and Reverse Clutch Overhaul (6L80) (Overhaul).