Code Definition

C1813 — Air Suspension LR Vent Request Exceeded Max Timing

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

About C1813

C1813 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.

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.

C1813 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 air suspension control module lowers the left rear corner of the vehicle by opening the left rear air spring solenoid together with the vent solenoid, releasing air from the spring while watching the ride height sensor to confirm the corner drops. DTC C1813 sets when a left rear vent request runs longer than the maximum time the module allows, meaning the commanded height change was not achieved or was never registered by the ride height sensor within the time limit. The root cause is usually pneumatic or mechanical rather than electrical, such as a solenoid that does not open, a blocked o...

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