Vehicle Speed Sensor Malfunction
Indicates an issue with the vehicle speed sensor or its circuit.
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 measures how fast the vehicle is moving and sends this information to the computer. If it fails, the computer can't tell how fast you're going, which can affect transmission and stability control systems.
What the computer is actually seeing
The computer expects a voltage signal from the vehicle speed sensor that changes with vehicle speed, typically a square wave of 0-5 volts. A malfunction may generate a constant signal or no signal at all.
What a healthy reading looks like
Expected voltage from the speed sensor should vary between 0 and 5 volts as speed increases. At a fully stopped position, voltage should be close to 0V. At speeds over 30 mph, expect 3-5V.
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 the vehicle speed sensor connector for damage and corrosion.
- 2Inspect the wiring harness for shorts, opens, or fraying.
- 3Test the vehicle speed sensor with a multimeter; expect varying voltage based on speed.
- 4If the sensor tests fine, check the wiring to the ECM for shorts or open circuits.
- 5Use a scan tool to check for accompanying codes that may indicate a related fault.
Common causes
- Faulty vehicle speed sensor
- Damaged wiring or connectors in the speed sensor circuit
- Bad wheel speed sensors
- Issues with the ABS module that uses speed information
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable, but you may experience transmission shifting issues and reduced stability control.
Will this code come back after clearing?
It may return if the underlying issue isn't fixed, such as bad wiring or a faulty sensor.
Why does this code pair with speed-related codes?
All these codes are related to speed input used by various systems like ABS, transmission, and traction control.
Working a real vehicle right now?
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