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What Is a 48-Volt Heated Aftertreatment System?

The diesel industry is entering another major emissions transition.

Beginning with EPA 2027 heavy-duty emissions regulations, diesel engines will face some of the strictest nitrogen oxide (NOxNO_x​) standards ever introduced for commercial vehicles.

One of the biggest technologies helping manufacturers meet these standards is the 48-volt heated aftertreatment system.

This system is designed to:

  • Heat emissions components faster
  • Reduce cold-start emissions
  • Maintain catalyst temperature during low-load operation
  • Dramatically reduce NOxNO_x output

Modern diesel engines already rely heavily on aftertreatment systems.

However, EPA 2027 standards require emissions systems to become even more effective during:

  • Cold starts
  • Idling
  • Low-load operation
  • Urban stop-and-go driving

That is where heated aftertreatment systems become important.

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