U0641

Lost Communication With EVAP System Pressure Sensor/Switch Circuit A

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–56 (est.)

Symptoms

Check Engine Light Is On
Increased fuel consumption
The car goes into emergency mode
Possible problems starting the engine
Other EVAP fault codes may appear

Causes

Open or short circuit in the EVAP pressure sensor circuit
Malfunction of the pressure sensor itself
Connector problems or contact corrosion
ECU malfunction
Damage to the EVAP system wiring harness

How to Fix

Check the continuity of the EVAP pressure sensor circuit
Inspect connectors and contacts for corrosion or damage
Check the functionality of the pressure sensor
If necessary, replace the EVAP pressure sensor
Check the condition of the EVAP system wiring harness

Related codes

U0640 U0642 U0643