Engine Intermittently Will Not Start at Very Low Outside Temperatures. The engine will not start at times at very low outside temperatures (-4°F/-20°C and colder); however, the battery state of charge is correct and the starter turns the engine over properly. This starting difficulty is most likely to occur after shutting the engine off briefly for 5 or 10 minutes, such as when refueling. The following faults are most likely stored in the DME: N20 engine: ? 1B5202 - Terminal 15N_1: No voltage? 1B5302 - Terminal 15N_2: No voltage ? 1B5402 - Terminal 15N_3: No voltage N52T engine: ? 1B5102 - Terminal 15N_3: line from CAS, electric: short circuit to earth ? 1B5501 - Terminal 15N: No voltage ? 1F0601 - Terminal 15N from CAS, switching delay: Switches too lateN55 engine: ? 1B5202 - Terminal 15N_1: No voltage? 1B5302 - Terminal 15N_2: No voltage ? 1B5402 - Terminal 15N_3: No voltage In addition, other engine electronic power supply-related faults could be stored for components such as VANOS solenoids, camshaft sensors, engine oil pressure sensor, engine oil pressure control valve, engine oil level sensor, etc. At very low outside temperatures, low levels of moisture present inside the power distribution module (PDM) can freeze the internal micro-relay contacts.
