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DTC P2728-P2730

DTC P2728-P2730

Diagnostic 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

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Clutch PC Solenoid 5 Control P2729 P2730 P2730 P2728


Typical Scan Tool Data

Pressure Control Solenoid Valve 5 Performance Test Status

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Operating conditions: Ignition ON Parameter Normal Range: OK
Pressure Control Solenoid Valve 5 Control - - - Fault or Malfunction


Pressure Control Solenoid Valve 5 Control Circuit Low Voltage Test Status

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Operating conditions: Ignition ON Parameter Normal Range: OK
Pressure Control Solenoid Valve 5 Control Fault or Malfunction - - -


Pressure Control Solenoid Valve 5 Control Circuit High Voltage Test Status

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Operating conditions: Ignition ON Parameter Normal Range: OK
Pressure Control Solenoid Valve 5 Control - Fault or Malfunction Fault or Malfunction -


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. If the pressure to the clutch's pressure control solenoid valve 5 is increased, then the pressure to 1-2-3-4 clutch increases. The transmission control module (TCM) varies the current to the PC solenoid 5 through a low side driver. 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 you complete the steps described above, check the diagnostic trouble code is not reset by driving the vehicle according to the conditions for running diagnostic trouble codes (DTC). You can also drive the vehicle according to the conditions you see in 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 .

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 Resetting of the transmission's adaption after all transmission repairs.

Before replacing the TCM, perform the 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