Code Definition

C1904 — Ride Control RR Shock Actuator Circuit Short To Ground

System: Chassis  |  Type: Manufacturer-Specific  |  Make: Ford

About C1904

C1904 is a manufacturer-specific chassis diagnostic trouble code recorded for Ford vehicles. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C1904 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

C1904 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Ride Control RR Shock Actuator circuit is part of the electronically controlled adaptive suspension system, where the suspension or air ride control module commands a solenoid actuator inside the right rear damper to vary shock firmness in real time. DTC C1904 sets when the control module detects that the right rear shock actuator control circuit is shorted to ground, sensing a current flow or voltage state outside the expected operating window for that output driver. The actuator is a variable solenoid that changes damping by altering an internal valve or orifice in response to a pulse wi...

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