Exhaust Gas Temperature Sensor 2 High
Indicates that exhaust gas temperature sensor 2 is reporting elevated values.
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What it means (plain English)
Your truck has a temperature sensor that checks how hot the exhaust is. When it says the temperature is too high, it could be sending out over 1,500°F, which can be caused by a stuck fuel injector or an actual overheating problem.
What the computer is actually seeing
The ECU sees a voltage from the exhaust gas temperature sensor that is above the normal operating range, often exceeding 2.5 volts for a 5V powered sensor setup.
What a healthy reading looks like
Expected voltage from the sensor should range between 0.5V to 2.5V under normal conditions; values above 2.5V likely indicate a fault.
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. Start with a visual inspect of the wiring and connectors to sensor 2 for damage or corrosion. If found, repair or replace as needed. Decision: if repaired, clear the code and retest.
- 22. Check the resistance of the exhaust gas temperature sensor at room temperature. It should be within specifications (often around 200-300 ohms). Decision: if out of spec, replace the sensor.
- 33. Use a scan tool to monitor the exhaust gas temperature sensor's live data during engine operation. If the readings exceed 2.5V, note any other DTCs that may be present.
- 44. Inspect exhaust system for signs of abnormal operation (e.g. leaks, blockage). Decision: if signs of overheating, address those issues accordingly before further diagnostics on the sensor.
- 55. If all tests are normal and error persists, check for related engine management faults that could cause excessive exhaust temperature.
Common causes
- Faulty exhaust gas temperature sensor
- Wiring issues (short to power or ground)
- Faulty engine management causing excessive exhaust temperatures
- Bad connectors or corrosion
- Sensor harness damage
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It's best to resolve this code soon as excessive temperatures can damage engine components.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, it will likely return.
Why does this code pair with SPN 4664?
SPN 4664 relates to the same sensor; these codes often appear together if there are multiple faults with the exhaust gas temperature circuit.
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