Code Definition

C1945 — Park Switch Indicates Park with Vehicle Moving

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

About C1945

C1945 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.

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.

C1945 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 park switch, also referred to as the transmission range or park neutral position input, tells the control module when the gear selector is in the Park position. The module cross checks this input against wheel speed or vehicle speed data to confirm it is plausible. DTC C1945 sets when the park switch reports Park while the wheel speed or vehicle speed signals show the vehicle is actually moving, which is an impossible combination. This usually results from a misadjusted or faulty range switch, a park signal circuit shorted into the active state, or a wheel speed input fault. When this code...

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