The Cummins ISX engine from 2001 to 2003 continued to build on the platform’s reputation for durability and power. Known for its electronic control module (ECM) and EGR systems, this era of the ISX provided improved emissions compliance while maintaining performance for heavy-duty applications.

Staying ahead of repairs means having quick access to clear, accurate fault code information. Understanding what those engine codes mean can save hours of guesswork and help you get trucks back on the road faster.

Cummins ISX (2001–2003) Engine Overview

  • Displacement: 15.0L

  • Horsepower Range: 400–565 HP

  • Torque: Up to 1,850 lb-ft

  • Emissions System: EGR

  • Fuel System: Electronic Control Module (ECM)

Applications: Commonly found in long-haul Class 8 trucks like Peterbilt, Kenworth, Freightliner, and International models.

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Fault Codes for Cummins ISX (2001–2003)

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