C157F BMW Fault Code
Check C157F OBD Fault Code ReasonVariable 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) C157F DTC is a check of the VCT unit.
C157F Code Symptoms :
The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. C157F code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired.
Diagnosis And Repairing C157F
C157F 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 C157F code ?
- Erratic camshaft position due to low oil pressure
- Damaged ECM
- Fuel injector leaks
- Fuel Injectors circuit poor electrical connection
Some systems require that the actuator has an adequate supply of brake fluid. Low brake fluid levels can mimic the symptoms of code C157F, so consult the manual to locate the brake fluid reservoir.
Bear in mind that a low fluid level can set code C157F on some applications, so make sure that on fluid operated systems the fluid level is up to the mark before starting an electrical diagnosis.
