Engine Exhaust Temperature Sensor 2
This code indicates an issue with the engine exhaust temperature sensor 2.
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 engine has multiple exhaust temperature sensors to monitor how hot the exhaust is. Sensor 2 is reading a value that doesn't match what's expected, which can affect engine performance and emissions control.
What the computer is actually seeing
The ECM expects the exhaust temperature from sensor 2 to be within a specified range based on engine operation. If the reading is too high or too low and out of the calibration range, it triggers this code.
What a healthy reading looks like
Typical expected value for exhaust temperature ranges from 300°F to 1,500°F depending on 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. Check the wiring and connectors for the exhaust temperature sensor 2. Look for damage, corrosion, or loose connections. If found, repair or replace as necessary. Decision: If wiring/connectors are good, proceed to step 2.
- 22. Using a scan tool, monitor the live data from exhaust temperature sensor 2. Compare the live reading with the expected values during engine operation. Decision: If the sensor reading is within expected range, seek further issues; if not, proceed to step 3.
- 33. Disconnect the exhaust temperature sensor 2 and perform a resistance check using a multimeter. Compare resistance values with manufacturer specifications. Decision: If resistance is out of spec, replace the sensor; if within spec, suspect issues in the ECM or exhaust system.
Common causes
- Faulty exhaust temperature sensor 2
- Wiring issues or corroded connectors in the sensor circuit
- Exhaust leaks near the sensor that affect readings
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; you can drive short distances but fix it soon to avoid potential emissions issues.
Will this code come back after repair?
If properly diagnosed and repaired, the code should not return.
Why does this code pair with SPN 3344?
SPN 3344 and SPN 3345 often occur together as they both relate to exhaust temperature sensor issues.
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