FMI 14 - Data Erroneous
The ECU has received data that it's determined is incorrect or out of range.
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 unit (ECU) is getting a signal from a sensor that doesn't make sense, like a temperature reading that jumps from 180°F to 300°F in a split second.
What the computer is actually seeing
The computer expects a stable input from a sensor, like a coolant temperature sensor returning a voltage between 0.5 to 4.5 volts for temperatures between -40°F and 257°F. Instead, it sees a voltage spike or drop that exceeds these limits.
What a healthy reading looks like
Expected voltage for sensor readings should be stable, like coolant temp sensor at 2.5V at 150°F. Erroneous readings will show extreme deviations, like 0V or over 5V.
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. Inspect the wiring and connectors to the affected sensor for damage or corrosion; repair as needed.
- 22. Test the sensor voltage with a multimeter; should be stable within expected range while engine temperature is changing.
- 33. If sensor voltage is erratic or outside range, replace the sensor and retest.
- 44. If condition persists after replacing, inspect and test the associated wiring and connectors again for shorts or opens.
- 55. If wiring checks out, consider testing or replacing the ECU.
Common causes
- Faulty sensor
- Wiring issue (short or open circuit)
- Bad ECU
- Corroded connectors
- Signal interference from other components
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable, but you might experience performance issues. Get it checked soon.
Will this code come back after clearing it?
If the underlying issue isn't fixed, it will usually return.
Why does this code show with other SPN codes?
It's common for multiple errors to happen if a single sensor or circuit is faulty.
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