The engine B1261 Code appears for the body problem and to understand the problem of the body, it is necessary to know meaning of the code and it is also important to know the manufacturer or model of the car. The engine B1261 code has different meaning and use the manual of the car. Meaning of B for Body Code Problem is antilock brake system, electronic suspension and steering systems. 1 for MFG – Manufacturer Specific. 2 for Accelerator Pedal Position Sensor 1 Performance. 6 for Control Module Throttle Actuator Position Performance. 1 for TFP Valve Position Switch-Drive Without Drive Ratio.