Vehicle Speed Sensor Error
Indicates a problem with the vehicle speed sensor or its circuit.
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 vehicle speed sensor measures how fast your vehicle is going. If it’s sending bad info or not working at all, your speed readings can be off.
What the computer is actually seeing
The ECM is expecting a voltage signal that varies between 0 and 5 volts according to vehicle speed. A signal that’s constantly high (close to 5V) or low (close to 0V) will trigger this fault.
What a healthy reading looks like
The vehicle speed sensor output should vary between 0V (stop) and 5V (at max speed), usually around 0.5V to 4.5V during normal operation depending 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. Inspect the wiring and connectors between the vehicle speed sensor and the ECM. Look for damage or corrosion.
- 22. Check for proper vehicle speed sensor operation: using a multimeter, while driving, the voltage should change according to speed (0-5V). If it doesn't change, suspect a faulty sensor.
- 33. If the sensor checks out, use a scan tool to monitor live data. Compare your vehicle speed with actual speed; if they differ significantly, check for ECM issues.
- 44. If all connections are good and the sensor outputs the correct signal, consider checking ECM for faults or reprogramming if necessary.
Common causes
- Wiring issue between the sensor and ECM
- Faulty vehicle speed sensor
- Corroded or loose connections
- ECM software glitch
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means you can drive the vehicle, but speed readings may be inaccurate, which could be dangerous.
Will this fault code come back if I clear it?
If the underlying issue isn't fixed, it will likely return after some driving.
Why does this code sometimes appear with SPN 222?
SPN 222 is often related to a loss of signal, frequently showing up when there are electrical issues with the speed sensor.
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