P1189high severityPowertrain
Fuel Rail Pressure Deviation
on 2007 BMW 325i 3.0L I6 N52 · RWD
What this code means
The DME detected that the actual fuel rail pressure deviates significantly from the commanded fuel rail pressure. The high-pressure fuel system is not maintaining the target pressure requested by the DME.
Symptoms
- Check Engine Light
- Loss of power
- Engine hesitation
- Hard starting
- Rough running at various RPMs
Common causes
- Failing high-pressure fuel pump
- Clogged fuel filter
- Leaking fuel injectors
- Fuel pressure regulator failure
- Low-pressure fuel pump weak
Diagnostic steps
- Monitor commanded vs actual fuel rail pressure with scan tool
- Test low-pressure fuel pump output
- Inspect fuel filter condition
- Check for fuel injector leaks
- Test high-pressure pump output
Repair notes
Replace the failing fuel system component causing the pressure deviation.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1