Code Definition

C1859 — PRNDL Input #2 Circuit Failure

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

About C1859

C1859 is a manufacturer-specific chassis diagnostic trouble code. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C1859 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.

C1859 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 input circuits report the position of the transmission range selector, Park, Reverse, Neutral, Drive, and the lower gears, to the control module using a set of switched inputs from the transmission range sensor or shifter assembly. Many systems use multiple parallel inputs so the module can decode the exact selected range and cross check it for plausibility. DTC C1859 sets when the control module detects a failure on the number 2 PRNDL input circuit, such as an open, a short, or a state that does not agree with the other range inputs. When this code is set, the module may be unable t...

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