Invalid Data Received from Vehicle Control Module
This code means there's a communication issue with the vehicle control module.
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 car's computer is expecting certain information from another control module, but it's not getting it correctly. For example, it expects a signal about vehicle speed but gets something incorrect or nothing at all.
What the computer is actually seeing
The main control unit (like the ECM or BCM) detects invalid or corrupted data on its communication bus from another module, usually due to a fault or poor connection.
What a healthy reading looks like
Modules should communicate within certain parameters; for instance, a speed sensor module should send speed data in a valid range (0-255 km/h) without spikes or drops.
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 all related wiring and connectors for damage or corrosion. Look for loose connections, especially around the control modules.
- 2Using a scan tool, clear the trouble codes and see if the U0406 code comes back. If it does, move to the next step.
- 3Check the voltage and ground at the affected control module connector (should be around 5 V for reference signals and 0 V for ground).
- 4Inspect other control modules connected on the same communication bus for any fault codes, especially U0401-U0415. This can help isolate the module causing the issue.
- 5Consider reprogramming or updating the software on the affected control module if all hardware checks out.
Common causes
- Faulty wiring or connections between control modules
- A failed or corrupted control module
- Software issues or glitches in the programming
- Aftermarket modifications interfering with communication
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It's usually safe to drive, but expect potential issues with vehicle functions associated with the control modules. Fix it soon.
Will this code come back after I clear it?
Yes, if there's an underlying issue, clearing it won't fix the problem, and it will reappear.
Why does this code appear with other codes?
Communication issues often involve multiple modules, so it's common to see related codes pointing to failures in the same network.
Working a real vehicle right now?
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