FMI 7: Incorrect Data Received from Electronic Control Unit (ECU)
This code indicates an issue with data being sent from the ECU.
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 Electronic Control Unit (ECU) is sending incorrect signals, possibly due to a sensor malfunction or communication error with other systems.
What the computer is actually seeing
The ECU is detecting inconsistent data in messages from a communication network, which may indicate failure in data transmission or grounding problems.
What a healthy reading looks like
Voltage levels should typically be between 0 and 5 volts. Expect stable and correct readings at all times—fluctuations may indicate a problem.
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 related to the affected sensors and ECU for corrosion or damage.
- 22. Use a DVOM to check voltage level at the affected sensors; expect 0-5 volts under normal conditions.
- 33. Inspect ground connections; a bad ground can cause erroneous readings. Repair if needed.
- 44. Monitor the communication network with a scan tool to check for DTCs in associated systems.
- 55. If steps 1-4 don't locate the issue, consider swapping the suspected faulty sensor with a known good one and retest.
Common causes
- Faulty sensor
- Wiring or connector issues
- Grounding problems
- Failed ECU
- Communication system errors
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but should be fixed soon to avoid further issues.
Will this code come back after resetting the ECU?
It may return if the underlying issue isn’t fixed.
Why does this code sometimes pair with SPN 614?
SPN 614 indicates a voltage fault, which is often related to data communication issues.
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