Engine Exhaust Temperature Sensor 2, Circuit Low
Indicates a low circuit voltage from the engine exhaust temperature sensor 2.
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What it means (plain English)
The exhaust temperature sensor 2 is supposed to send a voltage signal that indicates the temperature of the exhaust gases. When this sensor is faulty, it may send a voltage that is too low, causing issues with the engine management system's readings and decisions.
What the computer is actually seeing
The computer is looking for a voltage from the exhaust temperature sensor that typically ranges from 0.5V to 2.5V depending on the exhaust temperature; values below 0.5V are flagged as a fault.
What a healthy reading looks like
Expected voltage from Exhaust Temperature Sensor 2: 0.5V to 2.5V. Values below 0.5V indicate a problem.
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 connector at the exhaust temperature sensor 2 for corrosion or looseness. If it's damaged, repair or replace the connector.
- 22. Use a multimeter to check the voltage at the sensor wiring harness with the ignition on. Expected voltage should be between 0.5V to 2.5V. If it's lower, inspect the wiring for shorts or breaks.
- 33. If the wiring looks good, replace the exhaust temperature sensor 2 and clear the code. If the code returns, check for PCM updates or software issues.
- 44. Recheck the wiring for continuity and proper ground connection after replacing the sensor. Ensure the ground is solid and that there's no significant resistance.
Common causes
- Faulty exhaust temperature sensor 2
- Wiring issues (short to ground or open circuit)
- Corroded or loose connectors
- Electrical interference from adjacent components
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable, but you may have reduced performance and increased emissions until resolved.
Will the code come back after resetting?
It might; if the underlying issue isn't fixed, the code will likely return.
Why does this code pair with other exhaust-related codes?
These codes often relate to the same system, meaning if one component fails, it can affect others.
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