C3987 BMW Fault Code
Check C3987 OBD Fault Code ReasonFuel Rail Pressure Sensor in Range But Low The comprehensive component monitor (CCM) monitors the FRP pressure for acceptable fuel pressure. The test fails when the fuel pressure falls below a calibrated value.
Low fuel pressure Damaged BMW FRP sensor Excessive resistance in circuit Low or no fuel A FRP PID value below 551 kpa (80 psi) indicates a failure Low or no fuel A FRP PID value greater than 896 kpa (130 psi) indicates a failure.
C3987 Code Symptoms :
The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. C3987 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 C3987
C3987 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 C3987 code ?
- 1Camshaft Position Sensor circuit poor electrical connection
- Faulty Variable Camshaft Timing (VCT) position solenoid
- Air fuel ratio (A/F) Sensor 1 Bank 1 harness is open or shorted
- Radio frequency interference (RFI)
Some systems require that the actuator has an adequate supply of brake fluid. Low brake fluid levels can mimic the symptoms of code C3987, so consult the manual to locate the brake fluid reservoir.
Bear in mind that a low fluid level can set code C3987 on some applications, so make sure that on fluid operated systems the fluid level is up to the mark before starting an electrical diagnosis.
