When driving the vehicle, many factors affect its movement. Among these are speed, wind, weight distribution and road conditions. Taking this into account, it is essential that the suspension system, which includes springs, shocks and struts, is in good condition in order to achieve a better ride.
Although the components of the suspension system have undergone various changes over time, the basic objective of the suspension system remains the same; to provide steering stability and better ride comfort for the passenger.
The Air Suspension Module is responsible for controlling the right rear shock actuator of the ride control. If it malfunctions, a series of fault codes will be set. In the case of the C1904 OBDII code, it is set on Ford, Lincoln and Mercury vehicles when there is a short to ground in the shock absorber circuit.