6T70/6T75 - Automatic Transmission
DTC P2719-P2721
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P2719
- Clutch Pressure Control (PC) Solenoid 4 System Performance
DTC P2720
- Clutch Pressure Control (PC) Solenoid 4 Control Circuit Low Voltage
DTC P2721
- Clutch Pressure Control (PC) Solenoid 4 Control Circuit High Voltage
Circuit/System Description
The clutch pressure control (PC) solenoid 4 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 4 through the high side driver 1 circuit. The TCM control the clutch PC solenoid 4 through the clutch PC solenoid 4 control circuit. The normally low clutch PC solenoid 4 flows fluid to the 2-6 clutch when commanded ON and exhausts fluid when commanded OFF. The clutch PC solenoid 4 regulates the transmission fluid pressure to the 2-6 clutch.
Conditions for Running the DTC
* The engine speed is greater than 500 RPM for 5 seconds or greater.
* The ignition voltage is between 8.6-19.0 volts.
Conditions for Setting the DTC
P2719
The TCM detects an invalid voltage in the clutch PC solenoid 4 control circuit for 4.4 seconds in a 5.0 second sample.
P2720
The TCM detects low voltage on the clutch PC solenoid 4 control circuit for 300 milliseconds in a 375 millisecond sample.
P2721
The TCM detects high voltage on the clutch PC solenoid 4 control circuit for 300 milliseconds in a 375 millisecond sample.
Action Taken When the DTC Sets
P2719
* DTC P2719 is a Type C DTC.
* The TCM freezes transmission adaptive functions.
P2720 and P2721
* DTCs P2720 and P2721 are Type A DTCs.
* The TCM forces High Side Driver 1 OFF.
* The TCM inhibits the TCC.
* The TCM commands maximum line pressure.
* The TCM freezes transmission adaptive functions.
Conditions for Clearing the DTC
* DTC P2719 is a Type C DTC.
* DTCs P2720 and P2721 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 Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Circuit/System Verification
1. Ensure the transmission fluid temperature is between 50-80°C (122-176°F).
2. Operate the vehicle in 2nd gear long enough to ensure at least a 3°C (5°F) rise in TCM temperature.
3. 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.
• If the DTC does reset, replace the control solenoid (w/body and TCM) valve assembly.
Repair Instructions
Important:
* Perform the Service Fast Learn Adapts 6T70/6T75 - Automatic Transmission 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 Module References Programming and Relearning for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming