Transmission Fluid Pressure Sensor - Voltage Above Normal
Transmission fluid pressure sensor signal is too high.
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What it means (plain English)
The transmission fluid pressure sensor is sending a signal that measures more than the normal range, indicating potential pressure issues within the transmission system.
What the computer is actually seeing
The ECM sees a voltage from the transmission fluid pressure sensor that is typically higher than 4.5 volts or below 0.5 volts, which translates to abnormal fluid pressure readings.
What a healthy reading looks like
Expected voltage output from the transmission fluid pressure sensor should be between 0.5 volts (low pressure) and 4.5 volts (high pressure).
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. Inspect wiring and connectors to the transmission fluid pressure sensor. Look for damage, corrosion, or loose connections. If found, repair as necessary. Decision Point: If wiring is damaged, repair it and retest. If wiring is fine, continue to the next step.
- 22. Measure the voltage output of the transmission fluid pressure sensor with a multimeter while the engine is running. Voltage should be between 0.5 and 4.5 volts. Decision Point: If voltage is within range, it may be ECM-related. If voltage is above 4.5 volts, proceed to the next step.
- 33. Disconnect the transmission fluid pressure sensor and check the wiring harness pin-out for shorts to power or ground. Decision Point: If shorts exist, repair the shorted wiring. If no shorts are found, consider replacing the sensor.
Common causes
- Faulty transmission fluid pressure sensor
- Wiring issues or shorts in the sensor circuit
- Bad ECM (Engine Control Module) causing incorrect signals
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive the vehicle with this code?
Yes, it's drivable but you should fix it soon to avoid transmission issues.
Will this fault code come back after repairs?
If repairs are done correctly, it should not return unless there is another underlying issue.
Why does this code appear with SPN 9940?
SPN 9940 indicates low fluid pressure; both codes relate to sensor performance but in opposite pressure conditions.
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