Vehicle Speed Signal Fault
The system is not receiving a proper vehicle speed signal.
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 relies on sensors to know how fast the vehicle is moving; if it can't get that info, it's like driving blind.
What the computer is actually seeing
The data for vehicle speed is either missing or not within expected parameters, leading to a fault in speed-dependent features.
What a healthy reading looks like
Expected vehicle speed signal is approximately 0-200 km/h (0-124 mph) depending on make/model; typically a 0-5V signal sent from the speed sensor, pulsing as 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. Inspect the vehicle speed sensor and its wiring for visible damage or wear. Decision: Is the sensor intact? (Yes: go to step 2; No: replace sensor and retest)
- 22. Check the connector at the vehicle speed sensor for corrosion or poor connection. Decision: Is the connection clean and tight? (Yes: go to step 3; No: clean or repair the connector and retest)
- 33. Measure the voltage at the speed sensor connector while the vehicle is in motion. Expected value is a pulsing signal between 0-5V. Decision: Are you getting a proper voltage signal? (Yes: go to step 4; No: replace the speed sensor and retest)
- 44. Scan the engine control module (ECM) for any secondary codes or history of faults. Decision: Are there additional related codes? (Yes: diagnose those codes; No: further diagnosis may be needed on the ECM)
Common causes
- Faulty vehicle speed sensor
- Damaged wiring or connectors related to the speed sensor
- Faulty engine control module (ECM)
- Issues with the wheel speed sensors (if equipped)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; you'll have reduced functionality like speedo readings, but the vehicle should still drive. Fix it soon.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, it will likely reappear.
Why does this code sometimes pair with wheel speed sensor codes?
Both sensors contribute to determining vehicle speed; if one fails, it can affect how the other performs.
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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