P0115

DTC P0115

Test 1-7:

Circuit Description
The Engine Control Module (ECM) sends engine coolant temperature data to the Transmission Control Module (TCM). The TCM uses this data to initiate warm-up shift patterns and to establish default Transmission Fluid Temperature (TFT) values. The data is sent to the TCM 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 P0115 to set by itself. If a CAN fault occurs, other DTCs will set before DTC P0115.

When the TCM receives invalid engine coolant temperature data from the ECM, then DTC P0115 will set. DTC P0115 is a type C DTC.

Conditions for Running the DTC
^ The engine run time is greater than 5 seconds.
^ No other CAN errors are present.

Conditions for Setting the DTC
The TCM receives no valid engine coolant temperature data from the ECM for 2 seconds.

Action Taken When the DTC Sets
^ The TCM does not request the ECM to illuminate the Malfunction Indicator Lamp (MIL).
^ The TCM uses 25°C (77°F) as a default engine coolant temperature value.
^ The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as a Failure Record.
^ The TCM stores DTC P0115 in TCM history.

Conditions for Clearing the DTC
^ A scan tool can clear the DTC.
^ The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non emission related diagnostic fault occurring.
^ The TCM cancels the DTC default actions when the fault no longer exists and the DTC passes.