Transmission Fluid Pressure Sensor Range/Performance Problem
Transmission fluid pressure sensor is reporting values out of range.
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What it means (plain English)
The transmission fluid pressure sensor detects the pressure of the fluid inside the transmission. When it reports a value that is too high or low, it indicates a problem with the transmission system.
What the computer is actually seeing
The ECU interprets values from the transmission fluid pressure sensor. It expects a typical pressure range of 70-150 psi depending on operating conditions. If readings exceed 150 psi or drop below 30 psi, the code sets as the values are outside the expected performance parameters.
What a healthy reading looks like
Transmission pressure should typically range from 70 to 150 psi during operation, depending on load and temperature.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the transmission fluid level; ensure it is within the recommended range. If low, refill and test again. Decision point: If fluid level is good, proceed to step 2. If low, address the leak or refill and retest.
- 22. Inspect the wiring and connectors to the transmission fluid pressure sensor for damage, corrosion, or loose connections. Decision point: If wiring is intact, proceed to step 3. If damaged, repair or replace the wiring and retest.
- 33. Test the transmission fluid pressure sensor using a calibrated gauge to compare readings. Expected pressures should be within the range of 70-150 psi. Decision point: If sensor readings are within spec, proceed to step 4. If out of spec, replace the sensor.
- 44. If the sensor is good, check the TCM for any error codes or performance issues. Use a scan tool to check for related fault codes. Decision point: If no other codes are present, further diagnose the transmission system; if additional codes are present, follow the diagnostic guide for those codes.
Common causes
- Faulty transmission fluid pressure sensor
- Wiring issues (shorts or opens) in the sensor circuit
- Low transmission fluid level
- Contaminated or degraded transmission fluid
- Faulty transmission control module (TCM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It is not recommended to drive for long periods as transmission issues can worsen and lead to more expensive repairs.
Will this code come back after clearing it?
If the underlying issue is not resolved, the code will likely return after clearing.
Why does this code pair with SPN 590?
Both codes are related to transmission fluid pressure monitoring, indicating potential issues with the sensor or the transmission system itself.
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