U0640
Lost Communication With EVAP Fuel Vapor Temperature Sensor Circuit
U0640 is an OBD-II diagnostic trouble code meaning: Lost Communication With EVAP Fuel Vapor Temperature Sensor Circuit. Common causes: evap temperature sensor circuit open, short circuit in wiring harness. Estimated repair cost: $17–50.
Symptoms
- Check Engine light is on
- Problems starting the engine
- Increased fuel consumption
- Unpleasant smell of gasoline
- Dips during acceleration
Causes
- EVAP temperature sensor circuit open
- Short circuit in wiring harness
- Fuel vapor temperature sensor malfunction
- Bad contacts in connectors
- Problems with the engine control unit
How to Fix
- Check the integrity of the wiring harness to the sensor
- Inspect and clean the connector contacts
- Check the resistance of the temperature sensor
- Replace the fuel vapor temperature sensor if necessary
- Scan the ECU for additional errors
Related codes
Error U0640 by Vehicle Brand
FAQ
What does the U0640 code mean?
U0640 is an OBD-II diagnostic trouble code that indicates: Lost Communication With EVAP Fuel Vapor Temperature Sensor Circuit
What causes a U0640 error code?
The most common causes of U0640 include: EVAP temperature sensor circuit open; Short circuit in wiring harness; Fuel vapor temperature sensor malfunction; Bad contacts in connectors.
How do I fix a U0640 diagnostic trouble code?
To fix U0640: Check the integrity of the wiring harness to the sensor. Inspect and clean the connector contacts. Check the resistance of the temperature sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0640?
Yes, but get it checked soon
How much does it cost to fix U0640?
The estimated repair cost for U0640 is $17–50. Actual cost depends on your vehicle, location, and labor rates.
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