Engine Exhaust Temperature Sensor 1 - Out of Range High
The engine exhaust temperature is reading higher than expected.
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What it means (plain English)
The exhaust temperature sensor is reading hotter than 1,080°F (582°C), which can indicate a problem with the exhaust system or sensor itself.
What the computer is actually seeing
The ECM sees a voltage signal from the exhaust temperature sensor that exceeds an established threshold, typically above 4.5 volts, indicating unusually high exhaust temperatures.
What a healthy reading looks like
Normal exhaust temperature readings should be between 300°F (150°C) and 1,080°F (582°C) during operation under normal conditions.
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.
- 1Inspect the wiring and connectors of the exhaust temperature sensor for damage or corrosion. If found, repair or replace as necessary.
- 2Check the exhaust temperature sensor with a multimeter. It should output between 0.5 to 4.5 volts depending on temperature. If it's outside this range, replace the sensor.
- 3Using a scan tool, check for any related fault codes that might indicate other problems like turbo issues or fuel system faults. Address any additional issues identified.
- 4Visually inspect the exhaust system for leaks or obvious damage. Repair any exhaust leaks found before proceeding.
Common causes
- Faulty exhaust temperature sensor
- Wiring issues (shorts or corrosion)
- Exhaust leaks causing incorrect temperature readings
- Malfunctioning turbocharger or overboost conditions
- Excessive fuel in the combustion process leading to higher exhaust temps
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's generally not safe to drive since high exhaust temperatures can indicate potential engine damage.
Will this code come back after I fix the problem?
If the underlying issue is properly repaired, the code should not return, but clear it after repairs.
Why do I see this code with SPN 2452?
SPN 2452 relates to a different temperature sensor; it often occurs with multiple sensor failures or affecting the same system.
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