Transmission Range Sensor Circuit High Input
The transmission range sensor is reporting a high input signal.
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What it means (plain English)
The transmission range sensor tells the engine control module (ECM) what gear the transmission is in. If it senses too high a voltage, it indicates a problem with the sensor or wiring.
What the computer is actually seeing
The ECM receives a voltage signal from the transmission range sensor that should correspond to specific gear positions. A voltage higher than expected (typically above 5 volts) triggers this code.
What a healthy reading looks like
The expected voltage from the transmission range sensor is between 0.5 to 4.5 volts depending on gear position.
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 wiring and connector to the transmission range sensor for damage or corrosion. Connectors should be clean and secure. Decision: If found damaged, repair or replace; if okay, proceed to step 2.
- 22. Measure the voltage at the transmission range sensor connector while the vehicle is in different gear positions. Expected voltage should change from 0.5 to 4.5 volts. Decision: If voltage is out of range, replace the sensor; if within range, proceed to step 3.
- 33. Check for any blown fuses or power supply issues related to the transmission range sensor circuit. Decision: If blown, replace the fuse; if not, check for faults in the ECM. If the ECM is at fault, it may need to be reprogrammed or replaced.
Common causes
- Faulty transmission range sensor
- Damaged wiring or connectors
- Corrosion at electrical connections
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive as it may lead to transmission issues or unintended gear shifts.
Will this issue come back after repairs?
If the root cause is properly addressed, it shouldn't return; however, intermittent wiring issues can cause it to recur.
Why does this code pair with others like P0851?
They often point to similar issues in the transmission range sensor circuit, indicating problems with wiring, connectors, or the sensor itself.
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