P2728
DTC P2728-P2730Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P2728
Pressure Control Solenoid Valve 5 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
Pressure Control Solenoid Valve 5 Performance Test Status
Pressure Control Solenoid Valve 5 Control Circuit Low Voltage Test Status
Pressure Control Solenoid Valve 5 Control Circuit High Voltage Test Status
Circuit/System Description
The clutch pressure control (PC) solenoid 5 is part of the control solenoid valve assembly which has no serviceable components. The normally low PC solenoid 5 regulates and directs oil pressure to the 1-2-3-4 clutch regulator valve and 1-2-3-4 clutch boost valve. Increasing the pressure for the clutch pressure control solenoid valve 5 the pressure increases to the 1-2-3-4 clutch. The transmission's control module (TCM) varies the current to pressure control solenoid valve 5 via a drive circuit on the low side. Increasing the current to PC solenoid 5 increases oil pressure by closing OFF the solenoid exhaust port. Decreasing the current to PC solenoid 5 decreases oil pressure by opening the exhaust port. PC solenoid valve 5 is supplied with current from the TCM via 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
- DTC P2728 is not set.
- The engine speed is 400 RPM or greater for 5 seconds.
- The ignition voltage is 8.6 volts or greater.
P2729
- DTC P2729 is not set.
- The engine speed is 400 RPM or greater for 5 seconds.
- The ignition voltage is 8.6 volts or greater.
P2730
- DTC P2730 is not set.
- The engine speed is 400 RPM or greater for 5 seconds.
- The ignition voltage is 8.6 volts or greater.
Conditions for Setting the DTC
P2728
The 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
The TCM detects a short to ground on the clutch PC solenoid 5 control circuit for 1 second.
P2730
The 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.
- The TCM freezes transmission adaptive functions for the 1-2-3-4 clutch.
P2729
- DTC P2729 is a Type A DTC.
- The TCM commands maximum line pressure.
- The TCM freezes transmission adaptive functions.
- The TCM inhibits Tap Up/Down function.
- The TCM inhibits manual shifting of forward gears.
- The TCM limits the transmission to Reverse and 3rd gear operation.
P2730
- DTC P2730 is a Type A DTC.
- The TCM inhibits the TCC.
- The TCM forces the HSD OFF.
- The TCM commands maximum line pressure.
- The TCM freezes transmission adaptive functions.
- The TCM inhibits Tap Up/Down function.
- The TCM inhibits manual shifting of forward gears.
- The TCM limits the transmission to Reverse and 5th gear operation.
Conditions for Clearing the DTC
- DTC P2728 is a Type C DTC.
- DTCs P2729 and P2730 are Type A DTCs.
Reference Information
Connector End View Reference
- Component Connector End Views
- Inline Harness Connector End Views
Description and Operation
Transmission General Description
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
DT-47825-20 Adapter Harness
For equivalent regional tools, refer to Special Tools.
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 displays 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
3. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the conditions for running fault codes (DTC). You may also operate the vehicle within the conditions you observe from the freeze frame/failure records. If the vehicle passes the circuit/system verification procedure, then stop. Do not perform the circuit/system test or component test as this may result in unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections.
Circuit/System Testing
1. Note
You must perform the Circuit/System Verification first.
Remove control solenoid valve assembly Q8 with ignition OFF. See Replacing control solenoid valve assembly and transmission control module.
2. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection. Control Solenoid Valve and Transmission Control Module Assembly Inspection
3. Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
4. Connect the DT-47825-20 harness between the vehicle wire harness X1 20-way transmission 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 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.
Repair Instructions
Note
- Perform the Transmission Adaptive Values Learn following all transmission related repairs. Programming and Relearning
- 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 after completing the diagnostic procedure.
Control Module References for control solenoid valve assembly replacement, setup, and programming