Saturn Code P1779, also known as Engine Torque Delivered To TCM Signal, is an issue that affects Saturn vehicles. The code appears when the engine starts, and the engine speed is over 500 rpm for 5 seconds, the system voltage is over 10.0v, Fuel Cutoff is inactive, and the TCM does not receive the required information from the PCM over the CAN data bus. There are a few possible causes of this problem, such as the PCM not sending the required information to the TCM, trouble codes related to the CAN data bus, or a failed PCM. To diagnose the issue, an Onboard Diagnostic System Check of the PCM should be performed. There is also a related service bulletin, PIP5094, which can provide more information. To address Saturn Code P1779, it is important to understand the potential causes and solutions.
Causes and Solutions for Saturn Code P1779
| Cause | Solution |
|---|---|
| Perform an Onboard Diagnostic System Check of the PCM | Diagnose the issue to determine the root cause. |
| The PCM is not sending the required information to the TCM | Check the PCM to ensure that the information is being sent correctly. |
| Check for any trouble codes related to the CAN data bus | Clear any trouble codes associated with the CAN data bus. |
| PCM has failed | Replace the PCM with a new unit. |
Onboard Diagnostic System Check of the PCM
When Saturn Code P1779 appears, the first step should be to perform an Onboard Diagnostic System Check of the PCM. This will allow technicians to diagnose the issue and determine the root cause.
PCM is Not Sending the Required Information to the TCM
If the Onboard Diagnostic System Check of the PCM reveals that the PCM is not sending the required information to the TCM, technicians should check the PCM to ensure that the information is being sent correctly. If the PCM is not sending the correct information, the issue should be resolved before continuing with the repair.
Another potential cause of Saturn Code P1779 is trouble codes related to the CAN data bus. In this case, technicians should check for any trouble codes related to the CAN data bus and clear any trouble codes that are present.
PCM Has Failed
Finally, if all other potential causes of Saturn Code P1779 have been eliminated, it is possible that the PCM has failed. In this case, the PCM should be replaced with a new unit.
Conclusion
Saturn Code P1779, also known as Engine Torque Delivered To TCM Signal, can be a difficult problem to diagnose and repair. However, understanding the potential causes and solutions can help technicians quickly identify and repair the issue. The most common causes of Saturn Code P1779 are the PCM not sending the required information to the TCM, trouble codes related to the CAN data bus, or a failed PCM. To address Saturn Code P1779, it is important to understand the potential causes and solutions and take the necessary steps to repair the issue.
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