What does code P1859 mean?

Q: What does code P1859 mean?

Brake Switch Circuit Error Message From Engine Control. P1859 on Volkswagen vehicles means the engine control module (ECM) has received an error message from the brake switch circuit, indicating a mismatch between the brake pedal position and the expected signal. The ECM detects this when the brake light switch and the brake pedal position sensor disagree, or when the signal is implausible, often due to a faulty switch, wiring issue, or misadjusted sensor.

DTC codes / Volkswagen codes / P1859

P1859 · VolkswagenBrake Switch Circuit Error Message From Engine Control

P1859 on Volkswagen vehicles means the engine control module (ECM) has received an error message from the brake switch circuit, indicating a mismatch between the brake pedal position and the expected signal. The ECM detects this when the brake light switch and the brake pedal position sensor disagree, or when the signal is implausible, often due to a faulty switch, wiring issue, or misadjusted sensor.

SystemPowertrain

Code typeVolkswagen specific

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.