P2729
DTC P2728, P2729 or P2730
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach. Initial Inspection and Diagnostic Overview
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P2728
Clutch Pressure Control (PC) Solenoid 5 System Performance
DTC P2729
Clutch Pressure Control (PC) Solenoid 5 Control Circuit Low Voltage
DTC P2730
Clutch Pressure Control (PC) Solenoid 5 Control Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Clutch PC Solenoid 5:
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 TCM supplies 12 volts to the clutch PC solenoid 5 through the high side driver 2 circuit. The TCM control the clutch PC solenoid 5 through the clutch PC solenoid 5 control circuit. The normally low 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.
Conditions for Running the DTC
* The engine run time is greater than 5 seconds.
* The clutch PC solenoid 5 is commanded ON or OFF.
Conditions for Setting the DTC
P2728
The TCM detects an internal electrical performance malfunction of the clutch PC solenoid 5 control circuit and the actual 1-2-3-4 clutch pressure does not equal the commanded 1-2-3-4 clutch pressure for 5 seconds.
P2729
The TCM detects an internal low voltage electrical malfunction of the clutch PC solenoid 5 control circuit for 300 milliseconds.
P2730
The TCM detects an internal high voltage electrical malfunction of the clutch PC solenoid 5 control circuit for 300 milliseconds.
Action Taken When the DTC Sets
* DTCs P2728, P2729, and P2730 are Type A DTCs.
* The TCM defaults the transmission to a limited shift pattern utilizing 2 forward gears and reverse based on the default detected.
* The TCM commands maximum line pressure.
* The TCM freezes transmission adaptive functions.
Conditions for Clearing the DTC
DTCs P2728, P2729, and P2730 are Type A DTCs.
Diagnostic Aids
When attempting to set DTCs, ensure the TCM is warmed up and the transmission is operated in second gear long enough to ensure a 3°C (5°F) increase in TCM substrate temperature. This will place the TCM under the optimal conditions to test DTCs.
Circuit Verification
Perform the following procedure to place the control solenoid (w/body and TCM) valve assembly under the optimal conditions to test solenoid electrical DTCs.
1. Ensure the transmission fluid temperature is between 50-80°C (122-176°F).
2. Operate the vehicle in second gear long enough to ensure at least a 3°C (5°F) rise in TCM substrate temperature.
Component Testing
The scan tool data parameter Clutch PC 5 Sol. CKT Status normally displays OK.
If the parameter displays Open/Short to Volts or Short to GND or if the DTC resets, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection and if no concerns are found, replace the control solenoid (w/body and TCM) valve assembly.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
1. Replace the control solenoid (w/body and TCM) valve assembly. Refer to Programming and Relearning .Programming and Relearning.
2. Perform the Service Fast Learn Adapts. Programming and Relearning