EGR Temperature Sensor Circuit Out of Range
EGR temperature sensor reading is too high or low.
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What it means (plain English)
The EGR temperature sensor tracks the temperature of exhaust gases going back into the intake. If the reading is way off, the truck’s computer gets confused and can't properly adjust the engine's air-fuel mixture.
What the computer is actually seeing
The computer expects EGR temperature readings between 60°C to 350°C (140°F to 662°F). Any voltage reading from the EGR temperature sensor above 4.5V (too hot) or below 0.5V (too cold) will trigger this code.
What a healthy reading looks like
EGR temperature readings should be 150°C (302°F) at idle and can increase to about 400°C (752°F) under load. Voltages should range from 0.5V to 4.5V.
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.
- 1Check for any visible wiring damage or loose connections at the EGR temperature sensor. If found, repair or replace as necessary. Proceed to step 2.
- 2Using a multimeter, measure voltage at the EGR temperature sensor connector with the engine running. Expect 0.5V to 4.5V. If out of this range, replace the sensor. If within range, proceed to step 3.
- 3With the engine warmed up, check the EGR valve for proper operation and ensure it's not sticking. Clean or replace if necessary. Proceed to step 4.
- 4Inspect the EGR system for any excessive carbon build-up. Clean the EGR passages if needed and look for leaks in hoses or fittings. If all looks good, reassess the temperature sensor voltage. If problems persist, further diagnose the engine cooling system.
Common causes
- Faulty EGR temperature sensor
- Wiring issues (shorts or opens)
- Corroded or loose connectors
- Excessive carbon build-up in EGR system
- Cooling system problems affecting temperature readings
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity, so you can drive, but fix it soon as it affects engine performance and emissions.
Will this code come back after clearing it?
If there are underlying issues, yes, it will likely return. Ensure all related components are checked before clearing.
Why does this code sometimes pair with other codes?
Similar issues like emissions problems can trigger multiple faults related to the EGR system.
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