Invalid Data Received From Vehicle Speed Control Module
The engine control module (ECM) sees invalid data from the vehicle speed control module.
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What it means (plain English)
The computer in your vehicle is getting junk data from the speed control module, which controls how fast the car goes.
What the computer is actually seeing
The ECM expects a valid signal indicating vehicle speed but instead receives an out-of-range or nonsensical value, typically a value that is outside the parameters of 0-255 km/h.
What a healthy reading looks like
Vehicle speed should range from 0 km/h when stopped to appropriate speeds during driving, generally below 255 km/h for valid signals.
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 for any related DTCs, starting with U0402.
- 2Inspect wiring and connectors related to the speed control module for damage, corrosion, or loose connections.
- 3Verify the vehicle speed sensor output with a multimeter; it should be sending a consistent signal indicating speed when moving. Expected voltage should range from 0.5V to 5V, depending on speed.
- 4Use a scan tool to monitor real-time data from the speed control module; look for valid speed signals correlating with actual speed.
- 5If all testing is within spec and DTC persists, consider reprogramming or updating the ECM.
Common causes
- Damaged wiring or connectors between the ECM and the speed control module
- Faulty speed control module
- Software glitch in the ECM or speed control module
- Incorrect tire size affecting speed signal calculations
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but be cautious; you may encounter issues with cruise control and speedometer accuracy.
Will this code come back?
If the root cause isn't addressed, the code is likely to return.
Why is this paired with other U-codes?
These codes often involve communication errors between modules, so multiple codes can point to the same issue.
Working a real vehicle right now?
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