Transmission Output Speed Sensor Circuit
Output speed sensor is malfunctioning or reading incorrectly.
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What it means (plain English)
The transmission output speed sensor measures how fast the transmission is turning, usually sending a signal of 0-12 volts to the computer. This helps the computer to adjust shifting. If it fails, the transmission may shift poorly or even enter limp mode.
What the computer is actually seeing
The computer expects a stable voltage signal proportional to the output shaft speed, typically seeing 0.5V when at zero speed and up to 12V at maximum speed.
What a healthy reading looks like
Output speed typically around 2,000 RPM would correlate to a sensor output voltage between 4-8 volts during operation, depending on vehicle specifics.
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 connectors at the output speed sensor for frays or corrosion. Decision: Good wiring? Go to step 2, otherwise repair or replace wiring/connectors.
- 22. Test voltage at the output speed sensor connector with the key on and engine running. Expected voltage should be between 4-8 volts. Decision: Is the voltage in this range? If yes, proceed to step 3; if no, replace the output speed sensor.
- 33. Use a scanner to monitor the output speed reading while driving. Check if the reading fluctuates or drops unexpectedly. Decision: Is the reading stable? If no, the sensor likely needs replacement. If stable, check transmission for internal damage.
Common causes
- Wiring harness damage or short
- Faulty output speed sensor
- Poor connection at sensor or control module
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means it can drive, but expect poor shifting and potential transmission damage if ignored.
Will this code come back after repairs?
If the faulty part is replaced and wiring checked, it should not reappear.
Why does this code relate to others?
Related codes often indicate similar sensor or circuit issues affecting transmission performance.
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