Exhaust Gas Recirculation (EGR) Cooler Temperature Sensor Range/Performance Problem
EGR cooler temperature sensor reporting out of range values.
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What it means (plain English)
The EGR cooler temperature sensor is supposed to measure how hot the exhaust gas is after it passes through the cooler. If it sees temperatures that are way too high or low, it sets this code. For example, it should read around 150°F to 200°F under normal conditions but may show over 300°F or under 100°F.
What the computer is actually seeing
The engine control module (ECM) monitors the EGR cooler temperature sensor for a signal voltage typically between 0.5V to 4.5V, depending on the temperature. If the voltage is out of its expected range, the code is triggered.
What a healthy reading looks like
Expected voltage from the EGR cooler temperature sensor should range from 0.5V at 100°F to about 4.5V at 300°F.
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 connector for the EGR cooler temperature sensor; look for frayed wires or corrosion. If damaged, repair or replace as necessary.
- 22. Measure the voltage at the EGR cooler temperature sensor connector with the key on, engine off. It should be between 0.5V and 4.5V. If not, there may be a sensor or wiring problem.
- 33. If the sensor voltage is correct, start the engine and monitor the voltage while revving to 2000 RPM. The reading should change with temperature. If it stays constant, replace the EGR cooler temperature sensor.
- 44. If both the sensor and wiring are good, check for blockages or restrictions in the EGR cooler. Clean as needed. If issues persist, consider checking the ECM for faults.
Common causes
- Faulty EGR cooler temperature sensor
- Wiring issues (shorts or opens)
- Excessive EGR cooler fouling or blockage
- Faulty ECM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; it may drive, but expect potential emissions issues and reduced performance.
Will this code come back after I clear it?
If the underlying issue is not resolved, yes, the code will likely return.
Why does this code sometimes pair with other EGR codes?
Different EGR codes often arise from similar issues in the system, such as sensor failures or cooler blockages.
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