Engine Exhaust Temperature Sensor 2
Engine exhaust temperature sensor 2 circuit range/performance problem.
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What it means (plain English)
The computer is getting readings from the exhaust temperature sensor that don't make sense, often too high or too low compared to expected values.
What the computer is actually seeing
The sensor should vary between 0.5V (low temp) to 4.5V (high temp), but the readings significantly drift outside this range or are fixed at a certain voltage.
What a healthy reading looks like
Expect 0.5V at 200°F (93°C) and up to 4.5V at 1600°F (871°C) for exhaust temperature; check for a consistent signal that follows engine load and 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. Check the sensor wiring for any visible damage, loose connections or corrosion.
- 22. With the engine running, measure the voltage at the exhaust temperature sensor connector - should be between 0.5V and 4.5V.
- 33. If voltage is outside this range, replace the sensor and retest. If in range, go to step 4.
- 44. Inspect the exhaust system for any leaks between the sensor and the engine block that could affect temperature readings.
- 55. If no leaks are found, use a scan tool to check for additional trouble codes or historical data - addressing other codes as necessary.
Common causes
- Faulty exhaust temperature sensor
- Open or shorted wiring in the circuit
- Poor grounding or corroded connectors
- Exhaust system leaks causing false readings
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive the truck with this code?
Yes, but fix it soon as it can affect performance and efficiency.
Will this code come back after clearing?
If the problem persists, it will likely return. Fix the underlying issue first.
Why do I see this code with SPN 3620?
SPN 3620 and SPN 3621 are related; they both deal with exhaust temperature sensor issues.
Working a real vehicle right now?
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