Code Definition

C1842 — Air Suspension Disable Switch Circuit Short To Battery

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

About C1842

C1842 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 C1842 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.

C1842 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 C1842 is a manufacturer specific chassis code used on Ford and Lincoln vehicles with air suspension, including the Town Car, Expedition, and Navigator. The air suspension control module monitors the disable switch circuit using a low level sense voltage, and it sets C1842 when the voltage on that circuit is pulled up to battery voltage, indicating the wiring is shorted to a 12V power source rather than following the switch state. This is the short to battery variant in the same family as C1840 (circuit failure) and C1841 (circuit open). Because the module can no longer trust the switch inp...

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