Vehicle Speed Sensor Input Error
The vehicle's computer is getting an invalid signal from the 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 speed sensor measures how fast your vehicle is going, but the computer thinks there's something wrong with the signal it's getting. It might read too high, too low, or just not at all.
What the computer is actually seeing
The engine control module (ECM) expects a pulse signal that corresponds to vehicle speed, usually around 0-5 volts. If it doesn't see a reasonable pattern or if the voltage is outside of the expected range, it logs this code.
What a healthy reading looks like
A typical speed sensor produces about 0.5 to 2.5 volts at a stationary vehicle and varies as speed increases, ideally matching the vehicle speed in mph or km/h.
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 for physical damage or corrosion.
- 2Inspect the wiring and connectors leading to the speed sensor for breaks or shorts.
- 3Using a multimeter, measure the voltage at the speed sensor connector (expected 0.5 to 2.5 volts).
- 4Test the speed sensor with a scan tool to see if it is reading correctly while the vehicle is moving (it should vary with speed).
- 5If voltage is good at the sensor but not at the ECM, check the wiring continuity to the ECM.
Common causes
- Faulty vehicle speed sensor
- Wiring harness issues or shorts
- Damaged connectors
- Faulty ECM
- Ground issues
- Corroded terminals
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but you might experience erratic speedometer behavior and may not have accurate ABS or traction control functionality.
Will this issue come back after I fix it?
If you fix the root cause, such as replacing a faulty sensor or fixing damaged wiring, it shouldn't come back.
Why does this code show up with other codes?
It often pairs with codes related to other speed-related components, like ABS or traction control, indicating a broader issue with vehicle speed sensing.
Working a real vehicle right now?
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