C3639 BMW Fault Code
Check C3639 OBD Fault Code ReasonEGR Flow Insufficient Detected The EGR system is monitored during steady state driving conditions while the EGR is commanded on.
The test fails when the signal from the DPF EGR sensor indicates that EGR flow is less than the desired minimum. Vacuum supply EGR valve stuck closed EGR valve leaks vacuum EGR flow path restricted EGRVR circuit shorted to PWR VREF open to D.P.F. EGR sensor D.P.F. EGR sensor downstream hose off or plugged EGRVR circuit open to PCM VPWR open to EGRVR solenoid D.P.F. EGR sensor hoses both off D.P.F. EGR sensor hoses reversed Damaged EGR orifice tube Damaged EGRVR solenoid Damaged PCM Perform KOER self-test and look for DTC C3639 as an indication of a hard fault.
C3639 Code Symptoms :
When you turn on the ignition, the Service Engine Soon or Check Engine C3639 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 C3639!
Diagnosis And Repairing C3639
C3639 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 C3639 code ?
- Dirty Oil
- Camshaft advance mechanism binding (VCT unit)
- Continuous oil flow to the VCT piston chamber
- Fuel filler cap remains open or fails to close
Some systems require that the actuator has an adequate supply of brake fluid. Low brake fluid levels can mimic the symptoms of code C3639, so consult the manual to locate the brake fluid reservoir.
Bear in mind that a low fluid level can set code C3639 on some applications, so make sure that on fluid operated systems the fluid level is up to the mark before starting an electrical diagnosis.
