Transmission Output Speed Sensor Fault
Indicates a problem with the output speed sensor in the transmission.
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 output shaft is turning. If it's not working, the computer can't adjust power and performance properly.
What the computer is actually seeing
The ECM expects a voltage signal that correlates with the output shaft speed, typically between 0.5V - 5.0V based on RPM. A failure to register speed or sending an out-of-range signal is a fault condition.
What a healthy reading looks like
Normal operation should show a clean sine wave output voltage of 1V - 3V that increases with vehicle speed, with a frequency of 2Hz to 200Hz based on speed.
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 and condition. Ensure it's at the correct level and not burnt or contaminated. Decision: If fluid is low or dirty, correct it first and recheck for codes.
- 22. Inspect the wiring and connectors to the output speed sensor for damage or corrosion. Decision: If visible damage is found, repair or replace as necessary and retest the system.
- 33. Test the output speed sensor using a multimeter. Measure the voltage output while the vehicle is in motion. Decision: If the output is not within expected values (0.5V - 5V), the sensor may be bad and should be replaced. If output is within range, further diagnose the ECM or associated wiring.
- 44. If applicable, check for any additional fault codes that may relate to the transmission control. Decision: Address any additional codes found before concluding service.
Common causes
- Open or short circuit in the output speed sensor wiring
- Faulty transmission output speed sensor
- Corroded or poor electrical connections at the sensor
- Transmission fluid level low or contaminated
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable, but you'll notice shifting issues and decreased performance. Fix it soon.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, the code will return.
Why does this code pair with other speed sensor codes?
Multiple speed sensor codes can indicate issues with the transmission system, affecting readings from multiple sensors.
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 →