Automatic Transmission - 2MT70
DTC P2728-P2730
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 Descriptor
DTC P2728
- Pressure Control (PC) Solenoid 5 System Performance
DTC P2729
- Pressure Control (PC) Solenoid 5 Control Circuit Low Voltage
DTC P2730
- Pressure Control (PC) Solenoid 5 Control Circuit High Voltage
Diagnostic Fault Information
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 transmission control module (TCM) supplies 12 volts to the PC solenoid 5 through the high side driver 1 circuit. The TCM controls the PC solenoid 5 through the PC solenoid 5 control circuit. The normally low PC solenoid 5 flows fluid to the dampener clutch when commanded ON and exhausts fluid when commanded OFF. The clutch PC solenoid 5 regulates to the dampener clutch during auto start/stop transitions.
Conditions for Running the DTC
* The engine run time is greater than 5 seconds.
* The vehicle speed is less than 200 km/h (124 mph) for 5 seconds.
* The system voltage is 11-18 volts.
Conditions for Setting the DTC
P2728
The TCM detects an internal electrical performance malfunction of the clutch PC solenoid 5 control circuit when the actual pressure does not equal the commanded pressure for 5 seconds.
P2729
The TCM detects an internal low voltage electrical malfunction of the clutch PC solenoid 5 control circuit for 500 milliseconds.
P2730
The TCM detects an internal high voltage electrical malfunction of the clutch PC solenoid 5 control circuit for 500 milliseconds
Action Taken When the DTC Sets
* DTC P2728 is a Type B DTC.
* DTCs P2729 and P2730 are Type A DTCs.
* The TCM freezes transmission adaptive functions.
Conditions for Clearing the DTC
* DTC P2728 is a Type B DTC.
* DTCs P2729 and P2730 are Type A DTCs.
Diagnostic Aids
When attempting to set solenoid electrical DTCs, ensure the TCM is warmed up and the transmission is operated 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 solenoid electrical DTCs.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Circuit/System 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 long enough to ensure at least a 3°C (5°F) rise in TCM temperature.
Circuit/System Testing
The scan tool data parameter 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 (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 (Verification Tests) after completing the diagnostic procedure.
Control Module References (Programming and Relearning) for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming.