U0642

Lost Communication With EVAP System Pressure Sensor/Switch Circuit B

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–56 (est.)

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

U0641 U0643 P0450