2010 Cadillac CTS Sedan AWD V6-3.0L Page 2015

2010 Cadillac CTS Sedan AWD V6-3.0L Page 2015

Circuit/System Description

The clutch pressure control (PC) solenoid 5 is part of the control solenoid valve assembly which has no serviceable parts. 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, P2729, or P2730

* DTCs P2728, P2729, or P2730 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 5 is commanded ON.

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.

P2729

* DTC P2729 is a Type A DTC.

* The transmission defaults to 2nd gear or 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.

P2730

* DTC P2730 is a Type A DTC.

* The transmission defaults to 5th gear or reverse gear.

* The TCM forces TCC OFF.

* The TCM freezes transmission adaptive functions.

* The TCM commands maximum line pressure.