What Causes a Semi Truck to Derate?

A semi truck derate is a term used to describe when a truck’s power rating is reduced. This happens when the engine’s power output is lowered to meet specific emission requirements or when the engine has been modified.

The most common reason for a semi truck derate is emissions regulations. Many states require that certain trucks must have their engines tuned down to meet certain standards for air pollution. For example, California has some of the strictest emissions regulations in the United States, and all trucks operating in the state must be equipped with devices that reduce power output to meet these standards.

Another reason for a semi truck derate can be due to modifications or repairs made to the engine. If an engine has been modified in any way, it may need to be derated in order to maintain the same level of performance as it had prior to being modified. This could include adding new parts, replacing worn out components, or even tuning the engine differently than it was originally designed.

Lastly, if a semi truck has not been properly maintained or serviced regularly, it may need to be derated in order to ensure that it meets emission requirements and maintains its performance levels. Regular maintenance and servicing will help keep your vehicle running at optimal levels and prevent unnecessary derates.

Conclusion

In conclusion, there are several reasons why a semi truck might need to be derated. The most common cause is emissions regulations imposed by certain states, but modifications or repairs made to the engine and inadequate maintenance can also lead to a semi truck needing a derated power output.

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James Gardner