Code Definition

P1805 — Brake pedal position switch circuit fault

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Nissan

About P1805

P1805 is a manufacturer-specific powertrain diagnostic trouble code recorded for Nissan vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1805 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1805 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

This Nissan DTC is set when the Engine Control Module (ECM) detects an abnormal or inconsistent signal from the brake pedal position (BPP) switch circuit. The BPP switch reports brake pedal status to the ECM and transmission control so they can manage functions such as torque converter clutch release, idle speed control, and cruise control disengagement. The code logs when the signal is missing, stuck high or low, or does not correlate with operating conditions such as throttle input or shift state. Depending on the failure, the driver may find cruise control will not set, shifts feel harsh, t...

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