Engine Exhaust Temperature Sensor 2 Low
The temperature reading from the second engine exhaust temperature sensor is too low.
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What it means (plain English)
The computer expects the exhaust temperature to be around 300-800°F, but it's reading below 150°F, which means the sensor might be faulty or there's a problem with the exhaust system.
What the computer is actually seeing
The engine control module monitors temperature inputs from exhaust temperature sensors to manage emissions and engine performance. If the reading from sensor 2 drops below a preset threshold, it triggers this fault code.
What a healthy reading looks like
Expected exhaust temperature values are typically between 300°F and 800°F when the engine is running under load.
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 connectors for damage or corrosion on the exhaust temperature sensor 2. If defective, repair or replace as needed.
- 22. Measure the voltage at the connector, should be around 0.5V to 5V at normal operating temperatures. If the voltage is outside this range, consider replacing the sensor.
- 33. Check for exhaust leaks or restrictions in the exhaust system that could affect temperature readings. Repair any leaks found.
- 44. If the wiring and sensor are good, check the DPF (Diesel Particulate Filter) for blockages. If blocked, clean or replace it.
Common causes
- Faulty engine exhaust temperature sensor 2
- Open or shorted wiring to the sensor
- Poor exhaust flow due to a blocked DPF or system leak
- Incorrect grounding or connections of the sensor wiring
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I still drive my vehicle with this code?
It's not recommended as it could indicate an exhaust blockage or sensor failure, which could lead to further engine damage.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, the code will likely return.
Does it pair with other codes?
Yes, it can often appear alongside codes related to exhaust system issues.
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