U0642
Lost Communication With EVAP System Pressure Sensor/Switch Circuit B
U0642 is an OBD-II diagnostic trouble code meaning: Lost Communication With EVAP System Pressure Sensor/Switch Circuit B. Common causes: open or short circuit in the evap pressure sensor circuit, evap pressure sensor malfunction. Estimated repair cost: $17–56.
Symptoms
- Check Engine light comes on
- Smell of gasoline in or around the car
- Increased fuel consumption
- Unstable engine idling
- Errors related to the EVAP system
Causes
- Open or short circuit in the EVAP pressure sensor circuit
- EVAP pressure sensor malfunction
- Poor contact in the sensor connector
- Problems with power or circuit ground
- Engine control unit malfunction
How to Fix
- Check the integrity of wires and connectors in the sensor circuit
- Check power and ground to EVAP pressure sensor
- Test EVAP pressure sensor
- If necessary, replace the EVAP pressure sensor
- Check and update engine control unit software
Related codes
Error U0642 by Vehicle Brand
FAQ
What does the U0642 code mean?
U0642 is an OBD-II diagnostic trouble code that indicates: Lost Communication With EVAP System Pressure Sensor/Switch Circuit B
What causes a U0642 error code?
The most common causes of U0642 include: Open or short circuit in the EVAP pressure sensor circuit; EVAP pressure sensor malfunction; Poor contact in the sensor connector; Problems with power or circuit ground.
How do I fix a U0642 diagnostic trouble code?
To fix U0642: Check the integrity of wires and connectors in the sensor circuit. Check power and ground to EVAP pressure sensor. Test EVAP pressure sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0642?
Yes, but get it checked soon
How much does it cost to fix U0642?
The estimated repair cost for U0642 is $17–56. Actual cost depends on your vehicle, location, and labor rates.
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