Transmission Output Speed Sensor
Erratic or unavailable transmission output speed sensor signal.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The transmission output speed sensor measures how fast the transmission is turning. If it fails or gives wrong signals, the computer won't know how fast the vehicle is moving, which affects shifting and fuel economy.
What the computer is actually seeing
The engine control module (ECM) sees either a sudden drop in the voltage signal from the sensor below 0.5V or an inconsistent signal that doesn't match expected transmission RPMs.
What a healthy reading looks like
Expected voltage should be between 0.5V and 5V, corresponding to vehicle speeds. At a steady speed, voltage should remain stable.
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 vehicle speed sensor wiring for damage or disconnection; repair as necessary. Decision: If wiring is damaged, fix it and retest. If wiring is intact, proceed to step 2.
- 22. Inspect the sensor connector for corrosion or loose pins; clean or reconnect as needed. Decision: If there are issues, fix them and retest. If connector is good, proceed to step 3.
- 33. Use a multimeter to measure the output voltage from the transmission output speed sensor while driving; should be between 0.5V and 5V. Decision: If out of spec, replace the sensor. If within spec, check transmission operation.
Common causes
- Faulty output speed sensor
- Wiring issues or short circuits
- Connector problems or corrosion
- Transmission problems affecting sensor performance
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive the vehicle with this code active?
Yes, but expect poor shifting and possible drivability issues; fix soon.
Will this problem come back after fixing?
If repairs are correctly done, it shouldn't come back unless there are new issues.
Why does this code pair with others?
This code often relates to shifting performance, so other codes about transmission may show up together.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →