Fixing a Saturn P0843 Code can be a stressful experience, but with the right knowledge, you can troubleshoot the problem quickly and efficiently. The Saturn P0843 Code is a Transmission Fluid Pressure (TFP) Switch 1 Circuit High Voltage. This code appears when the Transmission Control Module (TCM) detects that the TFP switch 1 signal voltage is too high for more than 5.5 seconds when the 3-5-R clutch is commanded OFF. To ensure that the correct code is identified, it is important to make sure that the engine speed is 1,100 RPM or greater, the ignition voltage is between 8.6-19.0 volts, and the transmission fluid temperature (TFT) is 20-150°C (68-302°F). To help you better understand what causes the Saturn P0843 Code, and how to fix it, here is a table that outlines the causes and solutions:
Causes and Solutions of Saturn P0843 Code
| Cause | Solution |
|---|---|
| The TCM detects that the TFP switch 1 signal voltage is high. | Check the 3-5-R clutch is commanded OFF for 5.5 seconds or greater. |
| The engine speed is not 1,100 RPM or greater. | Verify the engine speed. |
| The ignition voltage is not between 8.6-19.0 volts. | Check the ignition voltage. |
| The transmission fluid temperature (TFT) is not 20-150°C (68-302°F). | Confirm the transmission fluid temperature. |
If you own a Saturn vehicle, you may have encountered the P0843 Code, which is a Transmission Fluid Pressure (TFP) Switch 1 Circuit High Voltage. This code appears when the TCM detects that the TFP switch 1 signal voltage is too high for more than 5.5 seconds when the 3-5-R clutch is commanded OFF. To diagnose the code correctly, you must ensure that the engine speed is 1,100 RPM or greater, the ignition voltage is between 8.6-19.0 volts, and the transmission fluid temperature (TFT) is 20-150°C (68-302°F). To help you better understand what causes the Saturn P0843 Code, and how to fix it, this article will provide a table of causes and solutions.
Cause 1: The TCM detects that the TFP switch 1 signal voltage is high.
The TCM detects that the TFP switch 1 signal voltage is too high for more than 5.5 seconds when the 3-5-R clutch is commanded OFF. To resolve this cause and the associated Saturn P0843 Code, you should check the 3-5-R clutch and make sure that it is commanded OFF for 5.5 seconds or greater.
Cause 2: The engine speed is not 1,100 RPM or greater.
The Saturn P0843 Code will appear if the engine speed does not reach 1,100 RPM or greater. To fix this issue and the associated code, you should verify the engine speed and make sure that it reaches 1,100 RPM or higher.
Cause 3: The ignition voltage is not between 8.6-19.0 volts.
The Saturn P0843 Code may also appear if the ignition voltage is not within the range of 8.6-19.0 volts. To resolve the issue and the associated code, you should check the ignition voltage and make sure it is between 8.6-19.0 volts.
Cause 4: The transmission fluid temperature (TFT) is not 20-150°C (68-302°F).
The Saturn P0843 Code may occur if the transmission fluid temperature (TFT) is not within the range of 20-150°C (68-302°F). To fix this issue and the associated code, you should confirm the transmission fluid temperature and make sure it is within the range of 20-150°C (68-302°F).
Conclusion
The Saturn P0843 Code is a Transmission Fluid Pressure (TFP) Switch 1 Circuit High Voltage. To diagnose and resolve the code, you should check the 3-5-R clutch, verify the engine speed, check the ignition voltage, and confirm the transmission fluid temperature. Once you have identified and resolved the cause of the Saturn P0843 Code, you will be able to fix the issue quickly and efficiently. By understanding the causes and solutions of the Saturn P0843 Code, you will be able to prevent and repair this issue in the future.
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