LOW COOLANT ALARM

UnclassifiedCooling

What This Code Means

Hard start; Rough running; Black smoke; Reduced power output; Coolant seeping at joints; Engine overtemperature; Slow crank

Possible Causes

  • Faulty fuel injectors (B3.3 inline-4)
  • Loose or damaged cooling system hoses and clamps
  • Starting battery bank failure
  • Extended no-load storage

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Get a diagnosis walkthrough for LOW COOLANT ALARM on your specific Cummins unit — cited to the OEM manual, not a forum guess.

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