The diagnosis B1271 Code is important thing to understand. Because it is necessary to know the model and manufacturer. The meaning of the code B1271 is different and meaning differs from car to car which related with model and manufacturer. Due to the body problem the code B1271 appears. The meaning of the B1271 is different. B is Body Code Problem is antilock brake system, electronic suspension and steering systems. 1 is MFG – Manufacturer Specific. 2 is Accelerator Pedal Position (APP) Sensor 1 Performance. 7 is Vehicle Speed Output Circuit and 1 means TFP Valve Position Switch-Drive Without Drive Ratio.