P399A BMW Fault Code

Description:

The Camshaft Position sensor will signal the Engine Control Module when the #1 cylinder is ready for the spark plug to fire (top-dead-center on compression stroke).

The ECM uses the information from this sensor to help calculate fuel delivery and spark timing.

P399A Code Symptoms :

When you turn on the ignition, the Service Engine Soon or Check Engine P399A light should flash briefly, indicating that the OBD system is ready to scan your vehicle for any malfunctions. After this brief flash, the light should stay off while you drive as long as no problems are detected. If so, you'll be glad to know that your vehicle is equipped with an early warning system that could save you time, money, and fuel in addition to helping protect the P399A!

Diagnosis And Repairing P399A

P399A 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 P399A code ?

• Exhaust gas leaks
• Faulty Mass Air Flow (MAF) sensor
• Fuel Injectors circuit poor electrical connection
• Lack of fuel

Some systems require that the actuator has an adequate supply of brake fluid. Low brake fluid levels can mimic the symptoms of code P399A, so consult the manual to locate the brake fluid reservoir.

Bear in mind that a low fluid level can set code P399A on some applications, so make sure that on fluid operated systems the fluid level is up to the mark before starting an electrical diagnosis.