Exhaust Gas Temperature Sensor 2
Indicates a problem with the second exhaust gas temperature sensor.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The second exhaust gas temperature sensor measures how hot the exhaust gases are after the DPF or SCR system. If it fails or reads incorrectly, it can affect the engine's efficiency and emissions systems.
What the computer is actually seeing
The engine control module (ECM) expects a voltage signal from the exhaust gas temperature sensor that typically ranges from 0.5V to 4.5V. If it receives a signal out of this range, it'll trigger SPN 383.
What a healthy reading looks like
The expected voltage values for a properly functioning sensor should be between 0.5V and 2.5V in normal operation. Above or below this indicates 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.
- 1Inspect the wiring and connectors leading to the exhaust gas temperature sensor for signs of damage, corrosion, or looseness. Fix any issues found and retest.
- 2Using a multimeter, check the voltage at the exhaust gas temperature sensor connector. Ensure it reads between 0.5V and 2.5V while the engine is running. If not, proceed to the next step.
- 3Replace the exhaust gas temperature sensor if the wiring and connector are good and the voltage readings are still out of range.
Common causes
- Wiring issues (shorts, opens, or corrosion)
- Connector problems (loose, corroded, or damaged)
- Failed exhaust gas temperature sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but keep an eye on engine performance. It's best to address it soon to avoid potential emissions issues.
Will this code come back after I clear it?
It might, especially if the underlying issue isn't fixed. Always address the root cause before clearing the code.
Why does this code pair with SPN 382?
SPN 382 indicates a problem with the first exhaust gas temperature sensor, often pointing to similar issues in the exhaust system.
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