Vehicle Speed Signal — Missing
The ECM detects no signal from the vehicle speed sensor (VSS).
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 computer looks for a speed signal from a sensor that tells it how fast the vehicle is going. If it doesn't see that signal, it throws this code.
What the computer is actually seeing
The engine control module (ECM) expects a voltage signal between 0.5V and 12V from the VSS that corresponds to vehicle speed. If it sees no voltage signal or a signal below the threshold, it triggers this code.
What a healthy reading looks like
0.5V to 12V signal from vehicle speed sensor; VSS should output a signal that varies with vehicle 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 leading to the vehicle speed sensor for damage or corrosion. Decision: If damaged, repair or replace.
- 22. Check the resistance and output voltage of the vehicle speed sensor while the vehicle is being driven. Expected output is between 0.5V and 12V. Decision: If voltage is out of specifications, replace the sensor.
- 33. Use a scan tool to monitor real-time data for the vehicle speed parameter. Decision: If there is no speed signal while the vehicle is moving, further investigate the ECM or wiring harness.
Common causes
- Faulty vehicle speed sensor
- Damaged wiring or connectors
- ECM software issue
- Incorrectly calibrated speed sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive the vehicle with this code?
Yes, but you'll have reduced functionality of systems relying on speed input, like ABS or transmission shifting.
Will this issue return after clearing the code?
It can return if the underlying issue isn't fixed, such as a bad sensor or damaged wiring.
Why does this code sometimes pair with transmission issues?
The transmission relies on the vehicle speed signal to shift properly; a missing signal can cause erratic shifting or transmission performance.
Working a real vehicle right now?
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