203
UnclassifiedCooling
What This Code Means
Low Coolant Temperature warning message; Genset coolant temperature is too low
Possible Causes
- •Coolant heater is not circulating coolant
- •Coolant heater is not operating
- •Genset coolant temperature remains below the LCT Warning Threshold for one minute
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Get a diagnosis walkthrough for 203 on your specific Cummins unit — cited to the OEM manual, not a forum guess.
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