U1402
Implausible Engine Temperature Signal Received
U1402 is an OBD-II diagnostic trouble code meaning: Implausible Engine Temperature Signal Received. Common causes: coolant temperature sensor malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $6–28.
Symptoms
- Unstable engine operation at idle
- Increased fuel consumption
- Difficulty starting the engine
- Check Engine Light Is On
- Reduced engine power
Causes
- Coolant temperature sensor malfunction
- Open or short circuit in the sensor circuit
- Poor contact in the sensor connector
- Software error in the engine control unit
- Corroded contacts or damaged wiring
How to Fix
- Check the resistance of the temperature sensor at different temperatures
- Inspect the sensor wiring and connectors for damage
- Check the voltage in the sensor circuit
- If necessary, replace the coolant temperature sensor
- Reset the error and check if it appears again
Related codes
FAQ
What does the U1402 code mean?
U1402 is an OBD-II diagnostic trouble code that indicates: Implausible Engine Temperature Signal Received
What causes a U1402 error code?
The most common causes of U1402 include: Coolant temperature sensor malfunction; Open or short circuit in the sensor circuit; Poor contact in the sensor connector; Software error in the engine control unit.
How do I fix a U1402 diagnostic trouble code?
To fix U1402: Check the resistance of the temperature sensor at different temperatures. Inspect the sensor wiring and connectors for damage. Check the voltage in the sensor circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1402?
Yes, but get it checked soon
How much does it cost to fix U1402?
The estimated repair cost for U1402 is $6–28. Actual cost depends on your vehicle, location, and labor rates.
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