P1831

DTC P1831 (3.0L)

Circuit Description
The Transmission Control Module (TCM) provides voltage to the pressure control solenoid, the shift solenoids, and the TCC PWM solenoid through 2 separate solid-state devices called High Side Drivers (HSD) - HSD1 and HSD2. HSD1 provides electrical power to the pressure control solenoid. HSD2 provides power to the shift solenoids and TCC PWM solenoid. A normal function of the TCM is to run tests on each driver to ensure that it is functioning properly.

When the TCM detects an open or a short to ground on HSD1, DTC P1831 sets. DTC P1831 is a type A DTC.

Conditions for Running the DTC
The engine run time is greater than 5 seconds.

Conditions for Setting the DTC
The TCM detects an open or a short to ground on the HSD1 circuit when the HSD1 is commanded ON for 4.3 seconds.

Action Taken When the DTC Sets
^ The TCM requests the ECM to illuminate the Malfunction Indicator Lamp (MIL).
^ The TCM commands an immediate landing to 2nd gear.
^ The TCM commands maximum line pressure.
^ The TCM inhibits TCC engagement.
^ The TCM commands HSD1 off.
^ The TCM freezes transmission adaptive function.
^ The ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as Freeze Frame and Failure Records.
^ The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records.
^ The TCM stores DTC P1831 in TCM history.

Conditions for Clearing the MIL/DTC
^ The ECM turns OFF the MIL after the third consecutive drive trip in which the TCM does not send a MIL illumination request.
^ A scan tool can clear the DTC.
^ The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission related diagnostic fault occurring.
^ The TCM cancels the DTC default actions when the ignition is OFF long enough in order to power down the TCM.

Steps 1 - 5:

DTC P1831 (3.0L)