P2729
DTC P2728-P2730
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 P2728
- Pressure Control Solenoid Valve 5 System Performance
DTC P2729
- Pressure Control Solenoid Valve 5 Control Circuit Low Voltage
DTC P2730
- Pressure Control Solenoid Valve 5 Control Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The clutch pressure (PC) solenoid 5 is part of the control solenoid valve assembly which has no serviceable components. The normally low clutch PC solenoid 5 regulates and directs the clutch PC solenoid 5 oil pressure to the 1-2-3-4 clutch regulator valve. Increasing clutch PC solenoid 5 pressure increases pressure to the 1-2-3-4 clutch. The transmission control module (TCM) varies the current to the PC solenoid 5 through a low side driver. Increasing the current to the clutch PC solenoid 5 increases clutch PC solenoid 5 oil pressure by closing OFF the solenoid exhaust port. Decreasing the current to the clutch PC solenoid 5 decreases clutch PC solenoid 5 oil pressure by opening the solenoid exhaust port. Clutch PC solenoid 5 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
P2728, P2729, or P2730
* Engine speed is 400 RPM or greater for 5 seconds.
* Ignition voltage is 9.0 volts or greater.
Conditions for Setting the DTC
P2728
TCM detects an internal electrical performance malfunction of the clutch PC solenoid 5 control circuit where the measured clutch PC solenoid 5 current does not equal the commanded clutch PC solenoid 5 current for 5 seconds.
P2729
TCM detects a short to ground on the clutch PC solenoid 5 control circuit for 1 second.
P2730
TCM detects an open or short to voltage on the clutch PC solenoid 5 control circuit for 1 second.
Action Taken When the DTC Sets
P2728
* DTC P2728 is a Type C DTC.
* TCM freezes transmission adaptive functions on the 1-2-3-4 clutch.
P2729
* DTC P2729 is a Type A DTC.
* TCM limits the transmission to 5th gear and reverse.
* TCM commands the high side driver OFF.
* TCM forces TCC OFF.
* TCM commands maximum line pressure.
* TCM freezes transmission adaptive functions.
* TCM inhibits neutral idle.
* TCM inhibits Tap Up/Tap Down.
* TCM inhibits manual up, manual down with the shift selector.
P2730
* DTC P2730 is a Type A DTC.
* TCM limits the transmission to reverse and 4th gear.
* TCM enables torque management.
* TCM inhibits neutral idle.
* TCM inhibits Tap Up/Tap Down function.
* TCM inhibits manual shifting of forward gears.
* TCM commands maximum line pressure.
* TCM freezes transmission adaptive functions.
Conditions for Clearing the DTC
* DTC P2728 is a Type C DTC.
* DTCs P2729 and P2730 are Type A DTCs.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics Electrical Diagrams
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-48616-10 - Adapter Harness
For equivalent regional tools, refer to Special Tools 6T30/6T40/6T45/6T50 - Automatic Transmission.
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.
3. Verify with a scan tool, the following test status parameters display OK.
* Pressure Control Solenoid Valve 5 Performance Test Status
* Pressure Control Solenoid Valve 5 Control Circuit High Voltage Test Status
* Pressure Control Solenoid Valve 5 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
4. 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 you observe 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. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection (Gen 1 with 1.4L - LCU, 1.6L - LDE or LFJ, 1.8L - LUW) Control Solenoid Valve and Transmission Control Module Assembly Inspection (Gen 1 with 1.4L - LCU, 1.6L - LDE or LFJ, 1.8L - LUControl Solenoid Valve and Transmission Control Module Assembly Inspection (Gen 2 with 1.4L - LUV) Control Solenoid Valve and Transmission Control Module Assembly Inspection (Gen 2 with 1.4L - LUV). The Q8 control solenoid valve assembly must be externally cleaned of all debris.
3. Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
4. Connect DT-48616-10 - harness between the vehicle wire harness X1 14-way transmission electrical connector, and the Q8 control solenoid valve assembly electrical connector, ignition ON.
5. Verify with a scan tool the following test status parameters display OK.
* Pressure Control Solenoid Valve 5 Performance Test Status
* Pressure Control Solenoid Valve 5 Control Circuit High Voltage Test Status
* Pressure Control Solenoid Valve 5 Control Circuit Low Voltage Test Status
• If any test status parameter displays Fault or Malfunction
Replace the Q8 control solenoid valve assembly.
• If all test status parameters display OK
6. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
Note: Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection (Gen 1 with 1.4L - LCU, 1.6L - LDE or LFJ, 1.8L - LUW) Control Solenoid Valve and Transmission Control Module Assembly Inspection (Gen 1 with 1.4L - LCU, 1.6L - LDE or LFJ, 1.8L - LUControl Solenoid Valve and Transmission Control Module Assembly Inspection (Gen 2 with 1.4L - LUV) Control Solenoid Valve and Transmission Control Module Assembly Inspection (Gen 2 with 1.4L - LUV).
* Refer to Control Module References Control Module References for control solenoid valve assembly replacement, programming and setup.
* Perform the Transmission Adaptive Values Learn Programming and Relearning following all transmission related repairs.