Fuel Rail Pressure Deviation
2002-2003 BMW X5 4.6is E53 4.6L V8
Description
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.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1189 on Other Vehicles
Common Questions
What does code P1189 mean on a 2002-2003 BMW X5 4.6is E53?
P1189 stands for "Fuel Rail Pressure Deviation". 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.
What are the symptoms of P1189 on a BMW X5 4.6is E53?
Common symptoms of P1189 include: Check Engine Light, Loss of power, Engine hesitation, Hard starting, Rough running at various RPMs.
What causes P1189 on a 2002-2003 BMW X5 4.6is E53?
Common causes of P1189 include: Failing high-pressure fuel pump, Clogged fuel filter, Leaking fuel injectors, Fuel pressure regulator failure, Low-pressure fuel pump weak.