Exhaust Gas Temperature Sensor 1 Out of Range
This code indicates that the exhaust gas temperature sensor 1 is reporting a temperature outside the expected range.
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 exhaust gas temperature sensor measures how hot the exhaust gases are. If it's too hot or too cold, the truck's engine control module gets a signal that something isn’t right, and it shuts down or changes how it operates to avoid damage.
What the computer is actually seeing
The ECM reads the signal from exhaust gas temperature sensor 1. If the voltage input deviates significantly from the standard (usually between 0.5V and 2.5V), it triggers this code.
What a healthy reading looks like
Expected temperature readings are typically between 300°F and 1,200°F (150°C and 650°C).
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 exhaust gas temperature sensor 1 connector and wiring for damage or corrosion. If damaged, repair or replace as necessary.
- 22. Check the resistance of exhaust gas temperature sensor 1. It should be within specifications; refer to manufacturer's chart for specifics. If out of range, replace the sensor.
- 33. Verify the exhaust system for leaks before the sensor. Replace gaskets or repair as necessary.
- 44. Clear the fault code and perform a test drive to see if the code returns. If it does, further investigation may be needed.
Common causes
- Faulty exhaust gas temperature sensor
- Wiring issues or damaged connectors
- Exhaust leaks before the sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s safe to drive temporarily, but you're at risk of engine overheating or damage. Fix it soon.
Why does this code come back after fixing the sensor?
Wiring issues or exhaust leaks are often the culprits. Make sure to check all related components.
What else could be wrong besides the sensor?
Check for wiring problems, bad connectors, or exhaust system issues before condemning the sensor.
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