Speed Sensor - Circuit Failure
This code indicates a failure in the speed sensor 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 speed sensor measures how fast the vehicle is moving. If it fails, the computer can't tell how fast you’re going, affecting performance and possibly triggering safety features.
What the computer is actually seeing
The ECM expects a signal from the speed sensor, usually a square wave output. A voltage between 0.5V to 5V is normal, depending on speed. If it detects a failure or no signal, it triggers this code.
What a healthy reading looks like
Normal operation should see frequency around 2Hz at low speed, increasing up to 40Hz or more at highway speeds; voltage output should be stable between 0.5V and 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.
- 1Inspect wiring and connectors for damage or corrosion: if damaged, repair/replace them.
- 2Check sensor output with a multimeter while the vehicle is in motion: if no voltage or irregular signals, suspect the speed sensor itself.
- 3Test sensor resistance: should be within manufacturer specs (typically around 1k to 2k ohms). If out of spec, replace the speed sensor.
- 4Clear the code and perform a road test: if the code returns, further investigate ECM or wiring issues.
Common causes
- Wiring issues or damaged connectors
- Faulty speed sensor
- Corrosion or dirt on sensor or connectors
- Incorrect ECM calibration
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable but may affect traction control or ABS functions, so proceed with caution.
Will this code come back after clearing?
Yes, if the underlying issue isn't resolved, the code will likely return.
Why does it pair with other codes?
Speed sensor failure can affect multiple systems, such as ABS and transmission, leading to multiple codes.
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