EGR Cooler Temperature Sensor 1 - Out of Range
The EGR cooler temperature sensor is reading outside of the expected range.
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What it means (plain English)
The EGR cooler has a temperature sensor that lets the engine computer know how hot the coolant is getting in the cooler. If that sensor reads too high or too low, it triggers this code.
What the computer is actually seeing
The engine control unit detects that the EGR cooler temperature sensor values are outside the set parameters, typically below 0.5V or above 4.5V.
What a healthy reading looks like
EGR cooler temperatures should normally be between 160°F and 200°F (71°C - 93°C). The voltage signal from the sensor should vary between 0.5V and 4.5V depending on the 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 the EGR cooler temperature sensor connector and wiring for damage or corrosion; repair or replace as needed, then recheck for codes.
- 22. Use a multimeter to check the voltage at the EGR cooler temperature sensor. Confirm it's within 0.5V - 4.5V. If not, replace the sensor.
- 33. Check the EGR cooler for coolant leaks or blockages that may affect temperatures. Fix any leaks and recheck.
- 44. Clear the fault codes and perform a road test to see if the code returns.
Common causes
- Open or shorted wiring to the EGR cooler temperature sensor.
- Faulty EGR cooler temperature sensor.
- Coolant leaks affecting sensor readings.
- Faulty engine control unit (ECU).
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's moderate severity; driving is possible but may cause increased emissions and affect performance.
Will this code come back after clearing it?
If the underlying issue isn't resolved, the code will likely return.
Why does this code often pair with SPN 5531?
SPN 5531 indicates a related EGR cooler temperature issue, making it common for them to trigger together.
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