Duramax L5P Diesel Engine & Aftertreatment Diagnostics

SKU: 24042235

List: Full Name, Email, Phone # of each attendee
The link you have clicked on has expired. Please contact us at
(800) 233-3182 Ext. 325 to discuss other options that may be available.

Price will increase to $299 after
April 1, 2024!

Dates Monday, April 22 - Tuesday, April 23 Add to Calendar
Time 6:00 p.m. to 9:30 p.m. Each Evening
Place Eastern Maine Community College
Penobscot Hall, Room #221
354 Hogan Road
Bangor, ME 04401
Map →
Instructor Kris Lewis
Contact Eboni Wheaton (800) 233-3182 Ext. 237

Download Enrollment Form


The 2017 & newer Duramax L5P and the related L5D are a huge improvement over LML, LGH and earlier generation Duramax applications. However, service information is even worse! It’s not so much ‘terrible’ as ‘nonexistent’. There are flow charts, but there’s no explanation as to how systems operate and how components interact. The L5P also signaled a shift from Bosch to DENSO fuel systems, the addition of a brushless low-pressure pump, the move to an electronically controlled turbocharger, and many more changes. These are significant engine management differences that just aren’t explained. To help you out, we’ve collected the specific ways that these new systems fail and offer lots of known good data and field-proven test procedures to diagnose them. Specifically, attendees will be able to:

  • Locate boosted duct leaks, including the use of the ‘leak PID’
  • Understand how sensor faults cause misleading injector timing and volume codes
  • Identify erratically named Duramax L5P sensors
  • Identify symptoms & solutions to MAP clogging
  • Examine fuse boxes and connectors for common failure points
  • Determine hard-start and no-start root causes
  • Apply relearns and system tests
  • Includes emissions: EGR, DPF, DOC & SCR

The seminar covers the ‘inside information’ you need. We will help you make a better possible cause list and show you simple tests to trim that list without taking too much apart. We’ve also created graphics that are missing from service information for the intake, fuel and emissions systems that show the ‘real’ component locations and flow through systems. This seminar is what you need to win against these diesels. 


Mission: To provide superior quality training and create industry-leading programs that produce consciously competent technicians that provide safe and proper repairs of current and future automotive technologies.


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