P1186high severityPowertrain
Fuel Pressure Monitoring Minimum Pressure Too Low
on 2002 Mercedes-Benz SL 3.0L I6 · RWD
What this code means
The ECU detected that the fuel rail pressure has fallen below the minimum required operating pressure. The high-pressure fuel system is not maintaining adequate pressure for proper injection.
Symptoms
- Check Engine Light
- Loss of power
- Hard starting
- Engine stalling
- Rough idle
Common causes
- Failing high-pressure fuel pump
- Clogged fuel filter
- Leaking fuel injector seals
- Low-pressure supply pump weak
- Fuel pressure regulator failure
Diagnostic steps
- Monitor fuel rail pressure with scan tool
- Test low-pressure fuel pump output
- Inspect fuel filter
- Check for fuel injector leaks
- Test high-pressure pump mechanical output
Repair notes
Replace the failing fuel system component causing low rail pressure.
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