Vehicle Speed Sensor Fault
Indicates a problem with the vehicle speed sensor.
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's speed sensor isn't sending the right info about how fast the vehicle is going, which can cause issues with shifting and other systems that depend on speed data.
What the computer is actually seeing
The ECM is expecting a voltage signal between 0.5V to 4.5V from the speed sensor, corresponding to vehicle speeds from 0 to 120 mph. If the voltage is out of this range or is consistently zero, it triggers this fault code.
What a healthy reading looks like
0.5V to 4.5V correlating with speeds from 0 to 120 mph.
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. Inspect the wiring harness and connectors for damage or corrosion. Repair or replace as necessary. Decision point: Is wiring intact? If yes, move to step 2; if no, repair wiring and retest.
- 22. Check the voltage at the speed sensor connector with the engine running. Expect 0.5-4.5V. Decision point: Is voltage within range? If yes, move to step 3; if no, replace the speed sensor.
- 33. If the sensor is new or known good, check for ECM updates or reprogramming. Decision point: Is the ECM updated? If yes, further diagnose the ECM; if no, perform updates and clear codes.
Common causes
- Faulty vehicle speed sensor
- Wiring issues (broken or shorted wires)
- Faulty connector or bad connections
- ECM or TCM malfunction
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe but could affect shifting and speed-related systems; fix soon.
Will the code come back after clearing?
If the underlying issue isn't resolved, yes, the code will likely return.
Why does this code pair with transmission issues?
Because the vehicle speed sensor data directly affects shifting; incorrect data can lead to poor shifting performance.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →