P1B99 BMW Fault Code

Description:

Variable Cam Timing Over-advanced (Bank 1) The comprehensive component monitor (CCM) monitors the VCT position for an over-advanced camshaft timing.
The test fails when the camshaft timing exceeds a maximum calibrated value or remains in an advanced position.

BMW cam timing improperly set No oil flow to the VCT piston chamber Low oil pressure VCT solenoid valve stuck closed Camshaft advance mechanism binding (VCT unit) P1B99 DTC is a check of the VCT unit.

P1B99 Code Symptoms :

When you turn on the ignition, the Service Engine Soon or Check Engine P1B99 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 P1B99!

Diagnosis And Repairing P1B99

P1B99 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 P1B99 code ?

• Erratic camshaft position due to low oil pressure
• EVAP system hose leaking
• Failures of clutch motion/travel sensors.
• Damaged camshaft position (CMP) sensor

Some systems require that the actuator has an adequate supply of brake fluid. Low brake fluid levels can mimic the symptoms of code P1B99, so consult the manual to locate the brake fluid reservoir.

Bear in mind that a low fluid level can set code P1B99 on some applications, so make sure that on fluid operated systems the fluid level is up to the mark before starting an electrical diagnosis.