Exhaust Gas Temperature Sensor 2, Circuit Low
The exhaust gas temperature sensor 2 circuit is reading low voltage.
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What it means (plain English)
The exhaust gas temperature sensor monitors the heat in the exhaust. When it reads a low voltage signal, it usually means there's a problem with the sensor, wiring, or the control module’s ability to interpret the data.
What the computer is actually seeing
The engine control module (ECM) is expecting a specific voltage level from the exhaust gas temperature sensor 2, usually between 0.5 to 4.5 volts under normal operation. A reading below this range indicates a fault.
What a healthy reading looks like
Expect the exhaust gas temperature sensor to output between 0.5V to 4.5V during normal operation; anything under 0.5V is considered low.
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 exhaust gas temperature sensor 2 connector for corrosion or damage. If found, repair or replace as needed.
- 22. Measure the voltage at the sensor while the engine is running. Voltage should be between 0.5V and 4.5V. If voltage is below 0.5V, proceed to step 3.
- 33. Inspect the wiring harness between the sensor and ECM for shorts or breaks. Repair any found issues and retest.
- 44. If wiring is good and sensor outputs low voltage, replace the exhaust gas temperature sensor 2 and retest the system.
- 55. If the problem persists after replacing the sensor, consider testing the ECM for faults.
Common causes
- Faulty exhaust gas temperature sensor 2
- Wiring issues (short or opens)
- Poor electrical connections
- Faulty ECM
- Corroded connectors
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's advisable to fix this code soon as it affects emissions, but it may be drivable in the short term.
Will this problem come back after fixing?
If the root cause, like wiring issues, is not fixed, it may return.
Why does this code appear with other codes?
Faults in the exhaust system often affect multiple components, causing multiple codes to set.
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