Code Definition

C1790 — Air Suspension LR Air Spring/Shock Solenoid Output Circuit Failure

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

About C1790

C1790 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 C1790 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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.

C1790 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

DTC C1790 is a Ford and Lincoln air suspension code indicating the suspension control module has detected a failure in the output circuit that drives the left rear air spring or shock solenoid. The module energizes this solenoid to add or release air at the left rear corner, or to adjust damping on shock based systems, and it monitors the driver circuit for opens, shorts, and excessive current whenever the output is commanded. The code sets when the electrical feedback from the output does not match the commanded state. When this code is set, the module typically suspends leveling at that corn...

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