P0727

DTC P0727


Circuit Description

Engine speed information is sent to the transmission control module (TCM) by the engine control module (ECM) through a communication network called the controller area network (CAN). Two circuits are used to communicate CAN data between the ECM and TCM. A Fault in the CAN will not cause DTC P0727 to set by itself. If a CAN fault occurs, other DTCs will set before DTC P0727. When the ECM sends the TCM an invalid engine speed, then DTC P0727 will set. DTC P0727 is a type B DTC.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0727 Engine Speed No Signal

Conditions for Running the DTC

^ The engine is running.

Conditions for Setting the DTC

^ The engine speed is invalid for 2.0 seconds.

Action Taken When the DTC Sets

^ The TCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.

^ The TCM commands maximum line pressure.

^ The TCM freezes transmission adaptive functions.

^ At the time of the first failure, the TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as a Failure Record.

^ At the time of the second failure, the ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as a Freeze Frame.

^ The TCM stores DTC P0727 in TCM history.

Conditions for Clearing the MIL/DTC

^ The ECM turns OFF the MIL after the sixth consecutive drive trip in which the TCM does not send a MIL illumination request.

^ A scan tool can clear the MIL/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 default actions when the ignition is OFF long enough in order to power down the TCM.