157/16 EPA07 EPA10 GHG14

The Motor Control Module (MCM) monitors the rail pressure and when rail pressure deviation is greater than 200 bar for eight seconds, the MCM sets the code. This fault can occur due to the conditions listed below:

  • External fuel leakage between the high pressure pump and fuel injectors
  • Pressure limiting valve leakage (internal)
  • Fuel filter integrity (loose caps, plugged filters)
  • Fuel supply issues (fuel level, fuel aeration, leaking fuel lines, fuel restrictions)
  • Intermittent loss of engine speed signal
  • High pressure pump internal failure
  • Fuel injector (amplifier or needle) leakage
  • Fuel Contamination
  • Rail pressure sensor
  • Motor Control Module (MCM)


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