B3431 BMW Fault Code

Description:

The Transmission Fluid Pressure Switch allows the engine's control module (PCM) or Transmission Control Module (TCM) to use hydraulic fluid to engage the clutches in the transmission to allow for smoother shifting while driving. If the PCM or TCM detects an issue with the hydraulic clutch or the pressure switch, the BMW PCM or TCM will set code B3431

B3431 Code Symptoms :

There are currently two main types of cylinder deactivation used today, depending on the type of engine. B3431 code for the pushrod design which uses solenoids to alter the oil pressure delivered to the lifters. In their collapsed state, the lifters are unable to elevate their companion pushrods under the valve rocker arms, resulting in valves that cannot be actuated and remain closed.

Diagnosis And Repairing B3431

B3431 OBD 2 code on vehicles with electronically controlled automatic transmissions, the 3-4 shift solenoid is responsible for actuating the hydraulic circuits to activate clutches or bands that change gears inside the automatic transmission.

How to fix B3431 code ?

• Exhaust tube
• Faulty Camshaft Position Sensor
• Intake Valve Timing Control Solenoid Valve harness is open or shorted
• Clogged or faulty fuel injector (s)

Some systems require that the actuator has an adequate supply of brake fluid. Low brake fluid levels can mimic the symptoms of code B3431, so consult the manual to locate the brake fluid reservoir.

Bear in mind that a low fluid level can set code B3431 on some applications, so make sure that on fluid operated systems the fluid level is up to the mark before starting an electrical diagnosis.