Exhaust Gas Temperature Sensor 2 Circuit Low
Exhaust gas temperature sensor 2 has a low voltage signal issue.
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What it means (plain English)
The exhaust gas temperature sensor 2 is reporting a voltage that is lower than expected. This could be caused by a short circuit to ground or the sensor failing, resulting in the engine computer thinking the exhaust isn't as hot as it really is.
What the computer is actually seeing
The engine control module (ECM) expects a voltage signal between 0.5V to 4.5V from the exhaust gas temperature sensor. A voltage below 0.5V indicates a fault in the circuit.
What a healthy reading looks like
Normal operating range should be between 0.5V and 4.5V when the engine is running.
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.
- 1Check for visual damage to the wiring and connectors of exhaust gas temperature sensor 2. Are there any visible signs of wear or corrosion? Decision Point: If yes, repair as needed. If no, move to next step.
- 2Using a multimeter, check the voltage at the exhaust gas temperature sensor 2 connector with the key on, engine off. What is the reading? Decision Point: If voltage is below 0.5V or no reading, check for a short to ground in the circuit. If voltage is within the range, the sensor may be faulty.
- 3Inspect the circuit for continuity from the sensor to the ECM. Does the circuit have continuity? Decision Point: If no, repair the wiring as needed. If yes, replace the sensor.
Common causes
- Damaged exhaust gas temperature sensor 2
- Short circuit in wiring to sensor
- Corroded or damaged connector
- Open circuit in wiring harness
- Poor ground connection
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive the vehicle with this code?
It's moderate severity, so it's drivable but should be fixed soon to avoid potential performance impacts.
Will the code come back after resetting it?
If the issue isn't fixed, the code will likely return as the low signal condition persists.
Why does this code pair with other SPN codes?
Multiple SPNs can indicate related faults in the exhaust system, particularly regarding sensors or wiring.
Working a real vehicle right now?
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