U3786 BMW Fault Code

Description:

Brake Switch Circuit Input Malfunction Indicates PCM did not receive a brake pedal position (BPP) input. Open or short in BPP circuit Open or short in stoplamp circuits damaged PCM Malfunction in module(s) connected to BPP circuit.

(Rear Electronic Module [REM] Windstar and LS6/LS8 or Lighting Control Module (LCM) Continental and Town Car. Damaged brake switch Misadjusted brake switch Check for proper function of stoplamps.

U3786 Code Symptoms :

There are currently two main types of cylinder deactivation used today, depending on the type of engine. U3786 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 U3786

U3786 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 U3786 code ?

• Damaged ECM
• Faulty Variable Camshaft Timing (VCT) position solenoid
• Fuel Injectors circuit poor electrical connection
• Faulty starter motor

Some systems require that the actuator has an adequate supply of brake fluid. Low brake fluid levels can mimic the symptoms of code U3786, so consult the manual to locate the brake fluid reservoir.

Bear in mind that a low fluid level can set code U3786 on some applications, so make sure that on fluid operated systems the fluid level is up to the mark before starting an electrical diagnosis.