P2637
DTC P2637
Circuit Description
Engine torque information is sent to the transmission control module (TCM) by the engine control module (ECM) through the controller area network (CAN). A two-wire circuit is used to communicate data between the ECM and TCM, CAN H and CAN L. A fault in the CAN will not cause DTC P2637 to set by itself. If a communication fault occurs, other DTCs will set before P2637.
When the ECM sends the TCM an invalid engine torque, DTC P2637 sets. DTC P2637 is a type A DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P2637 Transmission Torque Delivered Circuit
Conditions for Running the DTC
No other CAN errors are present.
Conditions for Setting the DTC
The engine torque is invalid for 1 second.
Action Taken When the DTC Sets
^ The TCM requests the ECM to illuminate the malfunction indicator lamp (MIL).
^ The TCM commands maximum line pressure.
^ The TCM freezes transmission adaptive functions.
^ 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 P2637 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 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 DTC default actions when the ignition switch is OFF long enough in order to power down the TCM.
