Exhaust Gas Recirculation (EGR) Cooler Temperature Sensor 1
EGR cooler temperature sensor signal is out of range or malfunctioning.
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What it means (plain English)
The temperature sensor for the EGR cooler isn't reading the right temperature, usually due to a malfunction or wiring issue.
What the computer is actually seeing
The Engine Control Module (ECM) sees a temperature reading that is too high or too low for the EGR cooler, often outside of the expected range.
What a healthy reading looks like
Typically around 150-190 degrees Fahrenheit when the engine is at normal operating 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.
- 11. Inspect wiring and connectors related to the EGR cooler temperature sensor for damage or corrosion, repair as needed.
- 22. Check coolant levels to ensure there are no leaks affecting sensor operation.
- 33. Use a scan tool to read the current EGR cooler temperature; is it within 150-190°F? If not, go to step 4.
- 44. Measure resistance from the sensor connector using a multimeter; is it within manufacturer specs? (Refer to service manual for values.) If not, replace the sensor.
- 55. If the sensor is good but readings are still out of range, check for a possible short or an issue with the ECM. Run a software update if applicable.
Common causes
- Faulty EGR cooler temperature sensor
- Damaged wiring or connectors
- Coolant leaks affecting sensor readings
- Faulty ECM software or programming
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; drivability may be affected but it is generally safe to drive short distances.
Will the code come back after clearing it?
If the underlying issue is not fixed, yes, the code will return.
Why does this code sometimes appear with others?
It often pairs with other EGR-related codes due to interconnected systems and shared wiring.
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