Code P1599, Cruise Power Management: Notes

Control module controlled cruise control system is designed to be self monitored to ensure desired cruise servo position and actual cruise servo position are equal to one another. If actual servo position is too high, control module will set Code P1568, and vehicle will operate in power management mode. While in power management, control module will shut off fuel to 3 cylinders to avoid overrevving engine in case throttle is being held open by a sticking cruise control throttle cable, brake vacuum release valve, or cruise control servo. Code P1599 is an information code included to alert service that vehicle has operated in power management mode. Code P1599 will set when vehicle has operated in power management mode.