Vehicle Speed Sensor Malfunction
Indicates a malfunction with the vehicle speed sensor system.
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 tracks how fast the vehicle is moving. If it fails, the computer won't know your speed, which can affect shifting and safety features.
What the computer is actually seeing
The control module expects a voltage signal that varies with vehicle speed. If the signal is missing or incorrect, the fault code triggers.
What a healthy reading looks like
When functioning properly, the speed sensor should output a voltage between 0.5V to 6V depending on vehicle speed, with normal operating speeds showing approximately 2.5V at 30 mph.
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 for physical damage to wiring and connectors at the speed sensor. Repair any issues found.
- 2Using a scan tool, verify if other related codes are set. If yes, address those first.
- 3Check voltage output from the speed sensor while the vehicle is moving; you should see the signal fluctuate based on speed. If not, the sensor is likely faulty.
- 4Inspect the vehicle's speed sensor; if there's no visible damage, replace it and retest.
- 5Clear the codes and take a test drive. If the code returns, verify the wiring back to the control module.
Common causes
- Wiring damage or corrosion at the sensor or connector
- Faulty speed sensor
- Bad connection or loose wiring
- ECU issues
- Incorrectly installed aftermarket parts
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; drivability can be impacted, and safety features may behave unexpectedly.
Will this code come back after clearing?
It can come back if the underlying issue is not fixed.
Why might this code pair with others?
It often relates to issues with the ABS or transmission systems, which also use speed input.
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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