I have a Chevrolet Express 2013 with the air bag light on, and DTC B0081 Passenger Presence System 1 Erratic (Symptom 0F) and B0091 Front End Sensor 3 (Symptom 00). I checked the connections under the passenger seat and tried to clear the code opening the door and waiting 40 seconds like I read on some posts. but the code still persits. I appreciate any help in trying to clear these codes. Thanks.

 

front end impact sensors are easily diagnosed....swap the left and right sensor...if the code follows the sensor...replace it. if it doesn't you have a wiring or module problem.

the pps fault is more involved to figure out. you may need factory load tools.