B1899 Code: Meaning, Causes, and Symptoms | OBD2 Codes
B1899 – Microphone Input Signal Circuit Open
B1899 Possible Symptoms
Engine Light ON (or Service Engine Soon Warning Light)
B1899 Possible Causes
Faulty Microphone,Microphone harness is open or shorted,Microphone circuit poor electrical connection,Faulty Body Control Module (BCM)
The Body Control Module (BCM) monitors the Microphone Input. The BCM sets the OBDII code when the Microphone Input is not to factory specifications.