2010 Cadillac Truck SRX FWD V6-3.0L Page 2125

2010 Cadillac Truck SRX FWD V6-3.0L Page 2125

Transmission/Transaxle/Valve Body/Service and Repair/AF40-6 - Automatic Transmission/Control Valve Body Replacement).

* TCM-Refer to Control Module References (See: Testing and Inspection/Programming and Relearning).

* Wiring harness-Refer to Automatic Transmission Wiring Harness Replacement (See: Transmission and Drivetrain/Automatic

Transmission/Transaxle/Wiring Harness/Service and Repair).

6T70/6T75 - Automatic Transmission

DTC P2728-P2730

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P2728

- Clutch Pressure Control (PC) Solenoid 5 System Performance

DTC P2729

- Clutch Pressure Control (PC) Solenoid 5 Control Circuit Low Voltage

DTC P2730

- Clutch Pressure Control (PC) Solenoid 5 Control Circuit High Voltage

Diagnostic Fault Information

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 PC solenoid 5

pressure increases pressure to the 1-2-3-4 clutch. The 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 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

* DTC P2728 has not set this ignition cycle.

* The engine speed is 400 RPM or greater for 5 seconds.

* The ignition voltage is 8.6 volts or greater.

P2729

* DTC P2729 has not set this ignition cycle.

* The engine speed is 400 RPM or greater for 5 seconds.

* The ignition voltage is 8.6 volts or greater.

P2730

* DTC P2730 has not set this ignition cycle.

* 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.