B0091 0F Chevrolet Silverado 3500 HD

The SDM has received erratic messages from the front end sensor.

B0091 39

1. The SDM has received a NOK message from the front end sensor.
2. The SDM has not received a message.

B0091 3A

1. The SDM has received an ID message from the front end sensor, which does not match the ID stored in the SDM memory.
2. The SDM has reset the front end sensor twice without detecting the correct ID message.