Exhaust Gas Temperature Sensor 2 Circuit High
This code indicates a high reading from the second exhaust gas temperature sensor.
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What it means (plain English)
When the second temperature sensor in the exhaust system reads a voltage that's higher than expected, it triggers this code. The sensor should give a signal voltage between 0.5V and 2.5V; anything above 2.5V is too high.
What the computer is actually seeing
The Engine Control Module (ECM) monitors the voltage from the second exhaust gas temperature sensor. If the ECM detects a voltage above 2.5V for a specified duration (like 200 milliseconds), it logs the SPN 3033 code.
What a healthy reading looks like
The expected voltage from the exhaust gas temperature sensor 2 should typically range from 0.5V to 2.5V under normal operating 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.
- 11. Inspect the wiring and connectors of the exhaust gas temperature sensor 2 for any signs of damage or corrosion. Are the connections secure?
- 22. Check the exhaust gas temperature sensor 2 with a multimeter. Is the voltage reading within 0.5V to 2.5V?
- 33. If the reading is high, check for exhaust leaks near the sensor that could affect temperature readings. Are there any visible signs of leaks?
- 44. If no leaks are found, replace the exhaust gas temperature sensor 2. Did the code clear and stay off after replacement?
- 55. If the code persists, inspect the ECM for any related issues or software updates. Are there any stored codes related to the ECM?
Common causes
- Faulty exhaust gas temperature sensor 2
- Wiring issues or damaged connectors
- Exhaust leaks affecting temperature readings
- ECM software glitch or failure
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe for short distances, but fixing it soon is recommended to avoid excessive emissions.
Will the code come back after a reset?
If the underlying issue isn't fixed, the code is likely to return.
Why is this code associated with exhaust temperature issues?
This sensor monitors the temperature to help control emissions and protect the exhaust system.
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