C3903 BMW Fault Code

Description:

The issue covered by the bulletin involves a power steering noise/whine or fluid leak from the power steering pump, gear or high pressure side power steering hose during extreme low outdoor temperature operation.

C3903 Code Symptoms :

If your C3903 check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system C3903 and engine control unit are in charge of monitoring a bunch of different , and if they get a reading that's a little out of whack, up pops the check engine light.

Diagnosis And Repairing C3903

C3903 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 C3903 code ?

• Continuous oil flow to the VCT piston chamber
• Camshaft advance mechanism binding (VCT unit)
• Exhaust gas leaks
• Faulty Camshaft Position Sensor

Some systems require that the actuator has an adequate supply of brake fluid. Low brake fluid levels can mimic the symptoms of code C3903, so consult the manual to locate the brake fluid reservoir.

Bear in mind that a low fluid level can set code C3903 on some applications, so make sure that on fluid operated systems the fluid level is up to the mark before starting an electrical diagnosis.