The automobile meaning of the engine U1797 Code is found online and it is U for Network Code Problem is climate control system, lighting, airbags, etc. 1 for MFG – Manufacturer Specific. 7 for Auxiliary Emission Controls. 9 for Crankshaft Position Sensor Circuit Performance and 7 for Cruise Inhibit Control Circuit. Do not use this general meaning of the code for fixing the car engine. This automobile meaning is a wrong meaning for your car and the wrong meaning of the code may lead you to wrong direction and may make many new problems in the car engine. Check the car when it is solved.