Output Speed Sensor Intermittent/No Signal
The vehicle's output speed sensor has no signal or intermittent communication with the ECM.
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What it means (plain English)
The output speed sensor measures how fast the transmission is turning. If it fails, the computer doesn't know your car's speed, making it hard to shift properly and can cause poor acceleration.
What the computer is actually seeing
The Engine Control Module (ECM) monitors the output speed sensor for voltage signals. If it doesn't receive a signal, the vehicle may have trouble shifting gears or accelerating smoothly.
What a healthy reading looks like
Expected output speed sensor voltage is typically 0-5 volts; a constant signal should be seen when the wheels are turning.
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 vehicle's transmission fluid level; ensure it’s full and not contaminated.
- 22. Inspect the wiring and connectors at the output speed sensor for damage or corrosion.
- 33. Test the output speed sensor: disconnect it and measure resistance; should be within manufacturer specs (usually around 400-1000 ohms).
- 44. With the sensor connected, check for voltage output at the sensor's connector (0-5V); if no signal, replace the sensor.
- 55. If the sensor tests okay, check for continuity from the sensor connector back to the ECM to rule out wiring issues.
- 66. If all checks are okay and the code persists, consider ECM diagnostics.
Common causes
- Faulty output speed sensor
- Wiring issues or poor connections
- ECM malfunction
- Transmission problems
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive, but expect poor shifting and acceleration; fix soon.
Will the code come back after clearing?
Yes, if the underlying issue isn’t fixed, it will likely return.
Why does this code pair with others?
They often indicate related faults, like issues with vehicle speed affecting transmission performance.
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