The automobile dictionary meaning of the engine U1147 Code is U for Network Code Problem is climate control system, lighting, airbags, etc. 1 for MFG – Manufacturer Specific. 1 for Transmission. 4 for BBV Sensor Circuit Low Voltage and 7 for Cruise Inhibit Control Circuit. When fuel economy was amplified, acceleration was very negotiated, and the loss of engine vacuum led to a hazardous loss of slowing contribution when the U1147 code system was in 4 cylinder mode. Moreover, these issues, while the company planned a hydraulically monitored system that could be converted from within the car, the version they realized had to be manually changed in the engine section using hand tools.