Exhaust Gas Temperature Sensor 2 Voltage High
Indicates a high voltage signal from the second exhaust gas temperature sensor.
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What it means (plain English)
The second exhaust gas temperature sensor is sending a voltage reading that's too high, usually over 4.5 volts, indicating a possible short or a sensor issue.
What the computer is actually seeing
The engine control module (ECM) or aftertreatment control module sees a voltage outside the normal range from exhaust gas temperature sensor 2, indicating a potential fault or short circuit in the wiring or sensor.
What a healthy reading looks like
The expected voltage range for the exhaust gas temperature sensor should typically be between 0.2V to 4.5V. Above 4.5V 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.
- 11. Inspect wiring and connectors for exhaust gas temperature sensor 2 for damage or corrosion. If found, repair accordingly and clear the code to see if it returns.
- 22. Check the resistance of the exhaust gas temperature sensor 2. A healthy sensor should show resistance within the range specified by the manufacturer (typically around 1000 ohms at room temperature). If it's out of spec, replace the sensor.
- 33. Measure the voltage at the exhaust gas temperature sensor 2 when the engine is running. It should be between 0.2V and 4.5V. If the voltage is over 4.5V, further investigate the harness for shorts to power. If under 0.2V, the circuit may be open or the sensor faulty.
Common causes
- Wiring short or damage to the harness
- Faulty exhaust gas temperature sensor 2
- Internal ECM fault
- Corrosion at connectors
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with code SPN 3465?
It's best to address it soon, but you can drive short distances if the engine isn't in limp mode.
Will this fault code come back after clearing it?
Yes, if the underlying issue isn't resolved, it will likely return after a short time.
Why does this sensor code pair with other SPN codes?
Multiple exhaust temperature sensors can trigger together if there's a common fault, like a damaged harness.
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