Motor/Compressor Temperature Sensor Voltage High
The engine control module detected a high voltage from the motor/compressor temperature sensor.
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What it means (plain English)
The sensor that tells the computer how hot the motor or compressor is has a voltage reading that’s too high, which usually means the sensor is shorted or damaged.
What the computer is actually seeing
The engine control module (ECM) sees a voltage reading from the temperature sensor above its normal operating range, typically above 5 volts.
What a healthy reading looks like
Normal voltage readings from the temperature sensor should be between 0.5 to 4.5 volts, corresponding to a temperature range usually from -40°C to +150°C.
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 connector of the temperature sensor for damage or corrosion. Decision: If wiring is damaged, repair it and retest. If not, proceed to step 2.
- 22. Check the voltage output at the temperature sensor with a multimeter. Normal range should be 0.5 to 4.5 volts with the engine at a normal operating temperature. Decision: If voltage is above 5 volts, proceed to step 3. If normal, consider a faulty ECM or other issues.
- 33. Disconnect the temperature sensor and measure the voltage at the connector. If it still reads high, the ECM may be faulty. Decision: If voltage reads normal, replace the temperature sensor.
Common causes
- Shorted temperature sensor
- Wiring harness issues (frayed or pinched wires)
- Bad ground connection
- Faulty ECM
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to fix this soon because a faulty temperature reading can affect engine performance and lead to damage.
Will this code come back after repair?
If the underlying issue is fixed (sensor or wiring), the code shouldn’t return.
Why does this code show up with others?
These codes can indicate related issues with engine temperatures and cooling, especially in diesel engines.
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