Vehicle Speed Sensor Circuit Failure
The vehicle's speed sensor signal is malfunctioning or missing.
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 speed sensor helps the computer know how fast the vehicle is moving. If it isn't working, the vehicle might not function properly, like shifting gears poorly or not working with cruise control.
What the computer is actually seeing
The engine control module (ECM) expects a frequency signal from the speed sensor that corresponds to the vehicle speed. This signal usually ranges from 0 to 12 volts. If this signal drops below 0.5 volts consistently or is absent, the code triggers.
What a healthy reading looks like
The speed sensor should provide a voltage between 0.5V (at low speed) to 5V (at high speed) as vehicle speed increases.
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 speed sensor wiring and connector for damage or corrosion. Repair if needed. Decision point: If damaged, fix it and retest; if good, proceed to step 2.
- 22. Measure voltage at the speed sensor connector with the key on and vehicle at rest. Expected: 5V. Decision point: If you see 5V, sensor may be okay; if no voltage, continue to step 3.
- 33. With the vehicle running, check for the expected waveform signal from the speed sensor while moving. Decision point: If no signal, replace the speed sensor; if signal is present, check for ECM issues.
Common causes
- Faulty speed sensor
- Damaged wiring or connectors
- Failed ECM
- Calibration issues
- Interference from aftermarket parts
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but expect issues like erratic shifting or no cruise control; fix it soon.
Will this code come back after resetting?
If the underlying issue isn't fixed, it will return shortly after resetting.
Why does this code appear with other codes?
It often pairs with related sensors or components like transmission codes, reflecting overall vehicle speed issues.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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