Vehicle Speed Sensor Circuit
The vehicle speed sensor (VSS) circuit is malfunctioning.
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 fails, the computer can’t get the right speed information, which affects engine performance and transmission shifting.
What the computer is actually seeing
The engine control module (ECM) looks for a voltage signal from the VSS. Normally, you should see a voltage that varies with vehicle speed. If it's too low (like below 0.5 volts) or totally absent, the ECM throws this code.
What a healthy reading looks like
Expected voltage output from the VSS is between 0.5 to 5 volts based on 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.
- 1Check vehicle speed sensor wiring for damage or wear. Look for shorts or breaks.
- 2Inspect VSS connector for corrosion or loose connections.
- 3Measure voltage output from VSS while vehicle is moving. Should be 0.5 to 5 volts.
- 4If voltage is incorrect, replace the VSS and retest.
- 5If voltage is good, check data from ECM. If it’s not registering speed correctly, consider reprogramming or replacing the ECM.
Common causes
- Faulty vehicle speed sensor
- Damaged wiring or connectors in the VSS circuit
- ECM failure or programming issue
- Speed sensor gear damage
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable, but expect issues with shifting and speedometer inaccuracies. Fix soon.
Will this code come back after clearing it?
If the underlying issue isn't fixed, it will likely return.
Why does this issue affect other systems?
The speed sensor data is used for transmission control and stability systems, affecting overall performance.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →