Code Definition

C1861 — PRNDL Input #4 Circuit Failure

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

About C1861

C1861 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 C1861 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.

C1861 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 PRNDL (Park, Reverse, Neutral, Drive, Low) input circuits report the transmission gear selector position to the vehicle control modules using several parallel signal wires that together form a coded pattern. On vehicles that use gear position for chassis and powertrain functions, a module monitors four PRNDL input lines, and DTC C1861 sets when the module detects an implausible or out of range signal on PRNDL input number 4. This is commonly caused by an open, short, or high resistance in that specific input wire, failed transmission range switch contacts, or connector corrosion. When the ...

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