When it comes to the Toyota Code P0990, many car owners may be wondering what it is and the causes and solutions. Generally, this code is related to the Transmission Fluid Pressure Sensor / Switch “E” Circuit High and occurs when both the Transmission fluid pressure switch No. 3 is ON. Lock-up does not occur when a shifting solenoid valve (SLU) is requested to turn off in the lock-up range. This issue can be caused by a variety of different factors, ranging from the ATF temperature sensor assembly (ATF pressure switch No. 3) and the Transmission wire to the TCM.
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Causes and Solutions for Toyota Code P0990
| Cause | Solution |
|---|---|
| ATF temperature sensor assembly (ATF pressure switch No. 3) | Replace the ATF temperature sensor assembly |
| Transmission wire | Inspect the transmission wire for damage and replace it if needed |
| TCM | Check the TCM and replace it if necessary |
| Shift Solenoid Valve (SLU) | Replace the Shift Solenoid Valve (SLU) |
ATF Temperature Sensor Assembly
When it comes to Toyota Code P0990, the ATF temperature sensor assembly (ATF pressure switch No. 3) is one of the most common causes. This sensor can become damaged or worn out over time, resulting in the code appearing. The best solution to this problem is to replace the ATF temperature sensor assembly with a new one to ensure the code does not return.
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Transmission Wire
Another common cause of the Toyota Code P0990 is a damaged or faulty transmission wire. This wire can become worn out or damaged over time, resulting in the code appearing. The transmission wire should be inspected for any damage and replaced if necessary to fix this issue.
TCM
The Toyota Code P0990 can also be caused by an issue with the car’s TCM (transmission control module). If the TCM is not functioning correctly, the code will appear. To fix this issue, the TCM should be checked for any problems and replaced if necessary.
Shift Solenoid Valve (SLU)
Finally, the Toyota Code P0990 can be caused by a faulty Shift Solenoid Valve (SLU). This valve can become worn out or damaged over time, resulting in the code appearing. The best solution to this problem is to replace the Shift Solenoid Valve (SLU) with a new one to ensure the code does not return.
Conclusion: Solving the Toyota Code P0990
The Toyota Code P0990 can cause many issues for car owners, but it is possible to solve these issues. By following the causes and solutions provided in this article, car owners should be able to fix Toyota Code P0990 quickly. The most common causes are related to the ATF temperature sensor assembly, transmission wire, TCM, and Shift Solenoid Valve (SLU), and the best solution to these issues is to replace the faulty part with a new one. With the right solutions, car owners can quickly fix the Toyota Code P0990 and get their car back on the road.
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