What does code P1385 mean?

Q: What does code P1385 mean?

Knock Sensor 4 Circuit. P1385 on a BMW indicates that the engine control module has detected an abnormal signal from the knock sensor assigned to cylinder bank 4, which is typically the sensor monitoring the rear-most cylinders on V12 or high-cylinder-count engines. The circuit voltage or resistance falls outside the expected range, preventing the computer from reliably detecting detonation and adjusting ignition timing to protect the engine.

DTC codes / BMW codes / P1385

P1385 · BMWKnock Sensor 4 Circuit

P1385 on a BMW indicates that the engine control module has detected an abnormal signal from the knock sensor assigned to cylinder bank 4, which is typically the sensor monitoring the rear-most cylinders on V12 or high-cylinder-count engines. The circuit voltage or resistance falls outside the expected range, preventing the computer from reliably detecting detonation and adjusting ignition timing to protect the engine.

SystemPowertrain

Code typeBMW specific

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

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