B127B Code: Meaning, Causes, and Symptoms | OBD2 Codes
B127B – Rearview Camera Input Signal
B127B Possible Symptoms
Engine Light ON (or Service Engine Soon Warning Light)
B127B Possible Causes
Faulty Rearview Camera,Rearview Camera harness is open or shorted,Rearview Camera circuit poor electrical connection,Faulty Human Machine Interface Control Module
When the vehicle is placed in reverse with the engine running, a voltage signal is sent to the rearview camera to turn on and send a video signal to the Human Machine Interface Control Module. If the Human Machine Interface Control Module does not see a signal from the camera it will set B127B 2B and display Service Rear Vision System.