Vehicle Speed Sensor A Signal Out of Range
The vehicle's speed sensor A is providing a reading outside of its normal range.
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What it means (plain English)
The speed sensor sends voltage to the computer based on how fast the car is going. If it sends a voltage that’s too high or too low, the computer thinks there’s a problem.
What the computer is actually seeing
The vehicle speed sensor A typically outputs a voltage signal that varies between 0 volts (0 km/h) and around 5 volts (maximum speed). If it sees a voltage above 5V or below 0V, it sets this code.
What a healthy reading looks like
Expected values for vehicle speed sensor A are between 0V to 5V depending on vehicle speed, with a normal reading of approximately 2.5V at 50 km/h.
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 connector at the vehicle speed sensor A for any damage or corrosion.
- 22. Measure the voltage at the sensor connector with the ignition on (engine off); you should see voltage within the 0-5V range.
- 33. If voltage is out of range, disconnect the sensor and test wiring continuity back to the ECM; repair as necessary.
- 44. If wiring is good, replace the vehicle speed sensor A and clear the code before retesting.
- 55. If the code returns, further diagnose the ECM and potential programming/calibration issues.
Common causes
- Faulty vehicle speed sensor
- Damaged wiring or connectors
- Faulty engine control module (ECM)
- Wheel speed sensor issues
- Calibration errors due to tire size changes
Typical repair cost
$$ (200-600)
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but you may experience incorrect speed readings and potential transmission issues.
Will this code come back after clearing?
If the underlying issue isn't fixed, the code is likely to return.
Why does this code sometimes pair with transmission issues?
The vehicle speed sensor directly affects shift points and operation, so any problem can impact transmission performance.
Working a real vehicle right now?
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