P2720
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
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The clutch pressure control (PC) solenoid 4 is part of the control solenoid valve assembly which has no serviceable parts. The normally low PC solenoid 4 regulates and directs oil pressure to the 2-6 clutch regulator valve. Increasing PC solenoid 4 pressure, increases pressure to the 2-6 clutch regulator valve. The Transmission Control Module (TCM) varies the current to the PC solenoid 4 through a low side driver. Increasing the current to PC solenoid 4 increases oil pressure by closing OFF the solenoid exhaust port. Decreasing the current to PC solenoid 4 decreases oil pressure by opening the exhaust port. PC solenoid 4 power is supplied by the TCM through a high side driver (HSD). The HSD protects the circuit and components from excessive current flow. If excessive current flow is detected, the HSD will turn OFF. When the fault is corrected the HSD will reset.
Conditions for Running the DTC
P2719, P2720, or P2721
* DTCs P2719, P2720, or P2721 have not set this ignition.
* The ignition voltage is 8.6 volts or greater.
* The engine speed is 400 RPM or greater, for 5 seconds.
* The clutch PC solenoid 4 is commanded ON.
Conditions for Setting the DTC
P2719
The TCM detects an internal electrical malfunction on the clutch PC solenoid 4 control circuit where the measured PC solenoid 4 current does not equal the commanded clutch PC solenoid 4 current for 5 seconds.
P2720
The TCM detects a short to ground on the clutch PC solenoid 4 control circuit for 1 second.
P2721
The TCM detects an open or short to voltage on the clutch PC solenoid 4 control circuit for 1 second.
Action Taken When the DTC Sets
P2719
* DTC P2719 is a Type C DTC.
* The TCM freezes transmission adaptive functions.
P2720
* DTC P2720 is a Type A DTC.
* The TCM defaults the transmission to a limited shift pattern utilizing 2nd gear and reverse gear.
* The TCM forces TCC OFF.
* The TCM freezes transmission adaptive functions.
* The TCM commands maximum line pressure.
* The TCM enables Torque management.
* The TCM inhibits TAP Up/Down function.
* The TCM inhibits manual shifting of forward gears.
P2721
* DTC P2721 is a Type A DTC.
* The TCM defaults the transmission to a limited shift pattern utilizing 3rd gear and reverse gear.
* The TCM forces TCC OFF.
* The TCM freezes transmission adaptive functions.
* The TCM commands maximum line pressure.
* The TCM enables Torque management.
* The TCM inhibits TAP Up/Down function.
* The TCM inhibits manual shifting of forward gears.
Conditions for Clearing the DTC
* DTC P2719 is a Type C DTC.
* DTCs P2720 and P2721 are Type A DTCs.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics Electrical Diagrams
Connector End View Reference
* Component Connector End Views Connector Views
* Inline Harness Connector End Views X101
Description and Operation
* Transmission General Description Transmission General Description
* Transmission Component and System Description Transmission Component and System Description
* Electronic Component Description Electronic Component Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Special Tools
DT-47825-10 - Jumper Harness
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Circuit/System Verification
1. Operate the vehicle in second gear long enough to ensure at least a 3°C (5°F) rise in TCM temperature, then operate the vehicle in Park for 5 seconds.
2. Operate the vehicle in drive range. Allow the transmission to shift through all forward gear ranges. Verify with a scan tool the following test status parameters display OK:
* Pressure Control Solenoid Valve 4 Performance Test Status
* Pressure Control Solenoid Valve 4 Control Circuit High Voltage Test Status
* Pressure Control Solenoid Valve 4 Control Circuit Low Voltage Test Status
• If any test status parameter displays Fault or Malfunction
Refer to Circuit/System Testing below.
• If all test status parameters display OK
3. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure then STOP. Do not perform the Circuit/System Testing or Component Testing as this may result in an unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections.
Circuit/System Testing
Note: You must perform the Circuit/System Verification first.
1. Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement Service and Repair.
2. Inspect the Q8 control solenoid valve and transmission control module assembly. The Q8 control solenoid valve and transmission control module assembly must be externally cleaned of all debris and each solenoid resistance value must be within the specified range. Refer to Control Solenoid Valve and Transmission Control Module Assembly Inspection Control Solenoid Valve and Transmission Control Module Assembly Inspection.
• If the solenoid resistance is not within the specified range
Replace the Q8 control solenoid and transmission control module assembly.
• If the solenoid resistance is within the specified ranges
3. Place the Q8 control solenoid valve and transmission control module on a clean work surface near the transmission assembly.
4. Connect DT-47825-10 - jumper harness between the vehicle wire harness electrical connector, and the Q8 control solenoid valve assembly electrical connector.
5. Ignition ON, verify with a scan tool the following test status parameters display OK:
* Pressure Control Solenoid Valve 4 Performance Test Status
* Pressure Control Solenoid Valve 4 Control Circuit High Voltage Test Status
* Pressure Control Solenoid Valve 4 Control Circuit Low Voltage Test Status
• If any test status parameter displays Fault or Malfunction
Replace the Q8 control solenoid valve assembly.
Repair Instructions
* Perform the Reset Transmission Adapts Reset Procedure following all transmission related repairs.
* Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Refer to Control Module References Control Module References for control solenoid valve assembly replacement, programming, and setup.