DERATE WARNING

UnclassifiedFuel

What This Code Means

Derate warning; NOx fault; DEF quality alert; Major power loss; Heavy exhaust smoke; Injector fouling; Hard starting; Failed start; Slow cranking; Failed to start; Slow crank

Possible Causes

  • DEF system (SCR catalyst) failure
  • Turbocharger failure
  • Fuel quality / degradation
  • Battery bank (24V) failure
  • DEF system (SCR catalyst) issue
  • Poor fuel quality
  • Battery failure

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