GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2006 🢒 Torrent 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - AF33-5 🢒 DTC P0115

Circuit Description

The powertrain control module (PCM) 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 PCM 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 PCM, then DTC P0115 will set. DTC P0115 is a type C DTC.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0115 Engine Coolant Temperature (ECT) Sensor Circuit

Conditions for Running the DTC
    • The ignition voltage is 10.2-15.5 volts.
    • The engine run time is 3 seconds or greater.
    • No CAN DTC U0100.
    • Trans. Protection Mode is OFF.
    • The engine speed is 400 RPM or greater.

Conditions for Setting the DTC

The PCM sends no valid engine coolant temperature data to the TCM for 4 seconds.

Action Taken When the DTC Sets
    • The TCM uses 80°C (176°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 Failure Record.
    • The TCM stores DTC P0115 in TCM history.

Conditions for Clearing 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.

Step

Action

Yes

No

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.

    3. Important: 

       • Before clearing the DTC, use the scan tool in order to record the PCM and the TCM Failure Records. Using the Clear Eng./Trans. DTC Info function erases the Failure Records from the powertrain control module (PCM) and the transmission control module (TCM).
       • Using the Clear Eng./Trans. DTC Info function erases stored DTCs in both the PCM and TCM.

  3. Record the DTC Failure Records.

Did you record any PCM Failure Records?

Go to Diagnostic Trouble Code (DTC) List - Vehicle

Go to Step 3

3
  1. Clear the DTC.
  2. Turn the ignition OFF for at least 30 seconds.
  3. Start, and allow the engine to idle.

Did DTC P0115 reset?

Go to Step 4

Go to Testing for Intermittent Conditions and Poor Connections

4

Did any other DTCs set?

Go to Diagnostic Trouble Code (DTC) List - Vehicle

Go to Step 5

5

Replace the PCM. Refer to Control Module References for replacement, setup, and programming.

Is the action complete?

Go to Step 6

--

6

Perform the following operation to verify the repair:

  1. Select DTC on the scan tool.
  2. Select Clear Info.
  3. Start, and allow the engine to idle.
  4. Select Specific DTC.
  5. Enter DTC P0115.

Does the DTC reset?

Go to Step 2

Go to Step 7

7

With the scan tool, observe the stored information, capture info and DTC info.

Does the scan tool display any DTCs that you have not diagnosed?

Go to Diagnostic Trouble Code (DTC) List - Vehicle

System OK