Low fuel rail pressure fault codes and low-power complaints are among the most common — and often misdiagnosed — issues in modern diesel-powered equipment and vehicles. This hands-on training course gives technicians the skills to confidently diagnose and repair these problems by breaking down the design, operation, and diagnostic process of electronically controlled High-Pressure Common Rail (HPCR) fuel systems. Practical examples are drawn from Cummins and Bosch HPCR systems, ensuring the lessons apply to real-world repair environments.
Throughout the course, you’ll gain a solid understanding of HPCR system components, safe diagnostic procedures, and the critical role of fuel system cleanliness. You’ll learn how contamination, water intrusion, or poor-quality diesel can lead to injector wear, pump failure, and overall loss of system performance — and how to prevent these costly issues with proper maintenance practices.
The course also provides a step-by-step troubleshooting framework for HPCR systems, showing how to interpret fuel rail pressure fault codes, verify readings against specifications, and trace low-power complaints to their root cause. The techniques taught here are transferable across multiple diesel engine brands and applications, from on-highway trucks to industrial equipment — giving you the confidence to handle common rail system diagnostics in any setting.
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Knowledge Check
The Cummins Aftertreatment Emission Systems Diagnostics virtual classroom will be immediately available once you've purchased the course! You can begin learning how to diagnose problems based on diesel engine fault codes, operate within EPA regulations on emissions, and start getting certified now!
Yes, the course uses Cummins and Bosch HPCR systems as practical examples to teach diagnostic techniques applicable across many modern diesel engines.
The course is designed for technicians with a basic understanding of diesel engines but is also valuable for experienced professionals looking to deepen their knowledge of HPCR diagnostics.
Absolutely. By understanding the design and operation of HPCR systems and following structured diagnostic steps, technicians can reduce misdiagnosis and improve repair accuracy.
In this course, you’ll gain a comprehensive understanding of electronically controlled High-Pressure Common Rail (HPCR) fuel systems, focusing on practical diagnostic techniques. You can expect clear explanations of key components and system operation, alongside step-by-step guidance for diagnosing common issues such as low fuel rail pressure faults. Using real-world examples from Cummins and Bosch systems, the course will teach you how to interpret fault codes, analyze sensor data, and effectively use diagnostic tools. With tips to avoid common misdiagnoses and interactive elements like videos and case studies, this course will equip you with the skills and confidence needed to accurately troubleshoot and repair modern diesel fuel systems.
