Your Bmw 2 engine control system detects a problem, the computer stores the diagnostic trouble
code U3977 in its memory.
To figure out what is wrong with your vehicle you must first extract the U3977 DTC For Bmw 2.
Do you have fresh, clean fuel in the tank? If it's empty, fill it up and go! If it's full, check U3977 Bmw 2 that the fuel shut-off valve is open and that it is clean. Stale fuel, dirt and debris are the most common cause of outdoor power equipment not starting properly. If you store equipment with untreated gas in the tank, it can lead to engine damage.
U3977 Bmw 2 DTC Meaning
Network Code - Problem is climate control system, lighting, airbags, etc.
SAE - Generic
Exhaust Gas Recirculation System Valve 1
Cruise Control System - Vehicle Accel Too High
The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. U3977 Bmw 2 code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired.