Invalid Data Received from HMI
Communication error between the ECM and HMI.
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 Engine Control Module (ECM) is not getting valid information from the Human Machine Interface (HMI), which can happen if the wiring is damaged or the HMI is malfunctioning.
What the computer is actually seeing
The ECM expects specific data from the HMI, typically related to vehicle status like speed, temperature, or gear position. When this data comes in as gibberish or out of expected ranges, you get a fault code.
What a healthy reading looks like
ECM expects a stable voltage signal typically between 0.5V and 4.5V depending on the information being transmitted.
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. Check the wiring and connectors between the ECM and HMI for signs of damage or corrosion. Decision: Is wiring intact? If yes, go to step 2; if no, repair or replace wiring.
- 22. Use a scan tool to check for additional codes. Decision: Any other related codes? If yes, investigate those; if no, go to step 3.
- 33. Test the HMI unit for function. Verify that it responds correctly when commanded. Decision: Is HMI functioning? If yes, consider reprogramming or updating the ECM; if no, replace the HMI.
- 44. After repairs, clear the codes and take the vehicle for a test drive to check if code returns.
Common causes
- Damaged wiring harness between ECM and HMI
- Faulty HMI unit
- Corroded connectors
- Software glitches in the ECM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, it's drivable but the functionality of certain gauges or warnings may be impaired.
Will this code come back after clearing?
It may if the underlying issue isn't resolved, especially if there's a persistent fault with wiring or HMI.
Why does this code pair with other codes?
Codes often appear together when there's a communication fault; addressing one may reveal or fix the other.
Working a real vehicle right now?
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