Vehicle Speed Sensor Data Invalid
The engine control unit is receiving invalid speed data from the vehicle speed sensor.
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What it means (plain English)
The vehicle speed sensor sends signals to the computer about how fast the vehicle is moving. If this data is wrong, the computer can't adjust engine performance correctly.
What the computer is actually seeing
The engine control unit (ECU) is monitoring the input from the vehicle speed sensor. It looks for a consistent range of voltage signals that represent speed, usually between 0 to 5 volts. If it sees values that are outside this range or inconsistent, it sets SPN 6200.
What a healthy reading looks like
Vehicle speed should be a smooth output corresponding to wheel speed; expected voltages for a functional sensor range from 0.5V (0 mph) to 4.5V (max 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.
- 11. Check wiring and connectors for the vehicle speed sensor for damage, wear, or corrosion. If faulty wiring is found, repair it before proceeding.
- 22. Measure the voltage output of the vehicle speed sensor with a multimeter while driving. Expected output is between 0.5V (0 MPH) to 4.5V (max speed). If the readings are out of this range, replace the speed sensor.
- 33. If the speed sensor output is correct, verify the engine control module (ECM) for proper operation and possible faults. Check for other related fault codes as well.
Common causes
- Faulty vehicle speed sensor
- Wiring issues or shorts in the sensor circuit
- Faulty engine control module (ECM)
- Improper installation of the sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with SPN 6200 active?
It's generally safe to drive, but the speedometer may not work correctly, and it could impact transmission shifting.
Will this code come back after I clear it?
If the underlying issue isn't fixed, the code will likely reappear.
Why does this code sometimes pair with SPN 100?
SPN 100 relates to engine temperature, which can affect speed sensor performance if the ECM has issues interpreting data.
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