EVAP valve signal.
Error Code :541 To understand the true meaning behind this DTC, let's try and break down its definition, 'EVAP valve signal. '. Right off the bat, we can see that this code has to do to with the vehicle's post catalyst fuel trim system, or to be more specific, the fuel itself. In the simplest of terms, this means that your powertrain control module (PCM) has detected via oxygen sensors in the exhaust system.
Even with the proper scanner to view stability system data, the sensor is usually operating correctly at the time of diagnosis. There isalso a service bulletin that refers to a wiring harness that may cause these codes, but most allof the time it is the sensor. The sensor is not hard to replace. Takes just 15 minutes or so.