Data Validity - Invalid or Missing Data Validity for Engine Coolant Temperature
Engine coolant temperature data is invalid or missing.
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's brain is looking for information about the coolant temperature, but it's not getting good data or anything at all.
What the computer is actually seeing
The ECM expects coolant temperature data between 0°C (32°F) and 125°C (257°F). Any values outside of this range or a complete drop to 0V signals an issue.
What a healthy reading looks like
Normal coolant temperature readings should range from 90°C (194°F) to 105°C (221°F) during operation. Sensor voltage should be between 0.5V and 4.5V based on temperature.
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 the engine coolant level. Ensure it's at the proper level.
- 2Inspect wiring and connectors for any damage, shorts, or corrosion. Fix any issues found.
- 3Using a scan tool, monitor the engine coolant temperature sensor data. Look for reasonable values while the engine is running.
- 4If the coolant temperature readings are out of specs (below 0°C or above 125°C), replace the coolant temperature sensor.
- 5If the sensor is functioning correctly, test the ECM for faults. If it's faulty, replace the ECM.
Common causes
- Faulty engine coolant temperature sensor
- Wiring issues (damaged, shorted, or corroded)
- Connector problems (loose or oxidized)
- Faulty Engine Control Module (ECM)
Typical repair cost
$$$ (100 - 500)
Related codes
Frequently asked questions
Is it safe to drive with this fault code?
It's best to address this code soon to avoid overheating, which can cause engine damage.
Will this problem come back after fixing?
If the root cause is properly addressed, the code shouldn't return.
Why does this code sometimes pair with other engine temperature codes?
If the coolant temperature sensor fails, it can trigger multiple related codes highlighting the same issue.
Working a real vehicle right now?
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