Temperature Sensor 3 - Voltage Above Normal
High voltage reading from Temperature Sensor 3.
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What it means (plain English)
The computer expects a normal signal voltage (0-5V) from Temperature Sensor 3, but it’s getting a higher voltage, which can confuse the engine management system.
What the computer is actually seeing
The engine control module (ECM) monitors Temperature Sensor 3's voltage. If the signal exceeds the normal range (typically above 4.5V), this code is triggered, indicating a potential issue with the sensor or its circuit.
What a healthy reading looks like
The normal operating voltage should range from 0.5V to 4.5V. Anything over 4.5V is considered high.
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 the wiring and connectors for Temperature Sensor 3. Look for frayed wires or loose connections. Is everything secure and intact?
- 22. Check the voltage at the Temperature Sensor 3 connector with a multimeter. Is the reading above 4.5V?
- 33. If voltage is high, backtrack the harness to find possible shorts. Any visible issues?
- 44. Test the Temperature Sensor 3 itself for resistance according to manufacturer specs. Does it match expected resistance values?
- 55. If the sensor tests within spec, check the ECM for error codes and/or update, if applicable. Any other active codes?
Common causes
- Faulty Temperature Sensor 3
- Short circuit in wiring
- Bad ECM signal processing
- Corrosion in connectors
Typical repair cost
$$
Related codes
Frequently asked questions
Can I continue to drive with this code?
It's best to address this code soon since it can affect engine performance and emissions.
Will this code come back after clearing it?
If the underlying issue isn't fixed, the code will likely reappear.
Why does this relate to other temperature codes?
High voltage in one temperature sensor can affect readings in related sensors, causing multiple codes.
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