Engine Exhaust Temperature Sensor 2 - Voltage Above Normal
The voltage from the second exhaust temperature sensor is too high.
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What it means (plain English)
The computer monitors the exhaust temperature to manage emissions and engine performance. If the second temperature sensor shows a voltage reading that's too high, it means there's likely a problem with the sensor or the wiring, causing the readings to be inaccurate.
What the computer is actually seeing
The engine control unit (ECU) expects a voltage between 0.5V and 1.5V from the exhaust temperature sensor under normal operation. A reading above 1.5V triggers the fault code.
What a healthy reading looks like
Normal operation should see 0.5V to 1.5V from the sensor. Anything above 1.5V 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. Check the wiring and connector at the exhaust temperature sensor 2 for damage or corrosion. Proceed if no issues are found.
- 22. Measure the voltage at the exhaust temperature sensor 2 connector with the engine running. Expected range is 0.5V to 1.5V.
- 3 - If voltage is above 1.5V, suspect a faulty sensor or shorted wiring. Go to step 3. - If voltage is normal, check engine coolant temperature and exhaust system for overheating.
- 43. Disconnect the exhaust temperature sensor 2 and measure the resistance of the sensor at room temperature. Expected resistance should be between 5 ohms to 20 ohms. - If resistance is out of spec, replace the sensor. - If specs are good, inspect wiring harness for shorts to power or ground.
Common causes
- Shorted wiring to the sensor
- Failed exhaust temperature sensor
- Corrosion in the connector
- Engine overheating issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this fault code?
It's moderately severe. You can drive it, but you should fix the issue soon to avoid potential engine performance problems.
Will the code come back if I clear it?
Yes, if the underlying issue isn't fixed, the code is likely to return after clearing.
Why does this code sometimes pair with SPN 1901?
SPN 1901 relates to the first exhaust temperature sensor, and issues with the wiring or sensors can trigger multiple faults.
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