Code Definition

B1751 — Park/Neutral Switch Circuit Short To Battery

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

About B1751

B1751 is a manufacturer-specific body diagnostic trouble code recorded for Ford vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1751 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

B1751 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 Body Control Module (BCM) on Ford vehicles equipped with passive anti-theft and shift interlock systems monitors the Park/Neutral Position (PNP) switch input to confirm transmission selector position. DTC B1751 is set when the BCM detects unexpected battery voltage on a PNP switch input line, indicating a short to power somewhere between the switch and the module. The PNP switch wires should sit at low signal voltage levels that change between defined values for each gear position, so a steady high voltage on a signal line means the wire has come into contact with a live source. When this ...

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