Monitoring function - power supply control motor

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 BMW Z4, 2008 BMW X5, 2008 BMW X3, 2008 BMW 528xi, and 2008 BMW 528i. However, it is still accessible from the selected car via links, so may be relevant.

P1055, P1056

Power supply control motor is monitored through the VVL relay and checks over and under voltage conditions. If this occurs, the following DTC's will be stored:

Error Symptoms:

ERROR SYMPTOMS

power supply over voltage	P1055
power supply under voltage	P1056