Vehicle Speed Signal
The vehicle speed signal is incorrect 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 computer is not getting a proper reading of how fast the vehicle is going, which is crucial for safety and operation.
What the computer is actually seeing
The Engine Control Unit (ECU) expects a speed signal between 0 and 255 kph from the speed sensor. A reading of 0 when the vehicle is in motion indicates a fault.
What a healthy reading looks like
Normal speed readings should match actual vehicle movement closely, typically between 0-255 kph.
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 for damage or disconnection. Repair as needed. Are the connections secure?
- 22. Measure the voltage at the speed sensor connector with the key on (engine off). Expected voltage is 5V to 12V. Is voltage present?
- 33. Check the signal wire from the speed sensor to the ECU with an oscilloscope. Expected signal should vary based on speed. Is the signal present and correct?
- 44. If issues are found in steps 1-3, replace the speed sensor. If everything checks out, test the ECU for faults.
Common causes
- Faulty vehicle speed sensor
- Open or shorted wiring in the speed sensor circuit
- Corroded connectors at the speed sensor
- Malfunctioning ECU
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s not ideal; while the vehicle may drive, you risk losing important vehicle functionalities like speedometer operation.
Will the code come back after fixing?
If the root cause is addressed properly, the code shouldn't return. Check all related connections.
Why is this related to my transmission?
Transmission control relies on accurate speed data to shift properly. If the signal is wrong, it can cause erratic shifting.
Working a real vehicle right now?
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