Loss of Vehicle Speed Sensor Signal
The vehicle speed sensor is not sending a signal to the engine control module.
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What it means (plain English)
The vehicle has a sensor that keeps track of how fast it's going, and if that sensor fails or gets disconnected, the engine computer can't figure out how fast the vehicle is moving, causing issues with shifting and engine performance.
What the computer is actually seeing
The engine control module expects a pulse signal from the vehicle speed sensor that indicates speed in mph or km/h, typically within a range of 0-255 Hz. If the signal is absent or outside the expected range, it will trigger this fault code.
What a healthy reading looks like
The vehicle speed sensor should produce pulses corresponding to vehicle speed; for example, at 30 mph, expect about 30 pulses per second (Hz).
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 wiring and connectors for the vehicle speed sensor for visible damage.
- 2Ensure the fluid level in the transmission is correct and not leaking, as low fluid can cause sensor issues.
- 3Using a scan tool, check for the current vehicle speed reading. If the reading is zero while the vehicle is moving, proceed to the next step.
- 4Measure the voltage at the vehicle speed sensor connector with the ignition on but engine off. Expected range is 5V to 12V.
- 5If voltage is present, use an oscilloscope to check for signals coming from the sensor. Expect to see pulses according to vehicle speed as mentioned before.
- 6If no pulses, replace the vehicle speed sensor. If pulses are present, check for issues in the wiring to the ECM.
Common causes
- Wiring issues or bad connectors to the vehicle speed sensor
- Faulty vehicle speed sensor
- Issues with the engine control module (ECM)
- Wheel speed sensor malfunction
- Gearbox problems affecting sensor output
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended. You may experience erratic shifts and reduced engine performance.
Will this code come back after repairs?
If all issues are fixed, the code should not return; however, make sure to clear the code and test drive to confirm.
Why does this code appear with transmission issues?
Because the vehicle speed sensor directly affects shifting, if it's faulty, it can lead to transmission performance problems.
Working a real vehicle right now?
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