Transmission Output Speed Sensor Fault
This code indicates a fault with the output speed sensor on 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 output shaft of the transmission is spinning to help the computer manage shifting.
What the computer is actually seeing
The transmission control module (TCM) monitors the output speed sensor to determine vehicle speed and adapt shifting strategies accordingly. The signal is usually a square wave pulse where frequency correlates to output shaft speed.
What a healthy reading looks like
Typical voltage signals from the output speed sensor range from 0.5V to 5V, with higher frequencies indicating higher speeds (e.g., 10 Hz for 1 MPH, 100 Hz for 10 MPH).
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 the wiring and connector to the output speed sensor for damage or corrosion. Repair as needed.
- 22. Check the transmission fluid level and condition. Top off fluid if low; replace if burnt or dirty.
- 33. Measure voltage at the output speed sensor connector while the vehicle is in motion. Expect 0.5V to 5V; if no signal, replace sensor.
- 44. If the sensor is good, scan for additional codes related to the TCM and confirm TCM operation using a scan tool to read live data.
- 55. If all else checks out but code persists, consider a TCM replacement.
Common causes
- Faulty output speed sensor
- Wiring or connector issues
- Faulty transmission control module (TCM)
- Low transmission fluid
- Internal transmission failure
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally not safe to drive as it can lead to erratic transmission behavior.
Will the code come back after resetting?
Yes, if the underlying issue isn't fixed, the code will reappear.
Why does this code pair with SPN 5471?
SPN 5471 is often related to the same circuit or system faults affecting the output speed sensor.
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