SAVE $150 off OTR Diagnostics Learn more
Getting started
Getting connected
What is an AHI Dosing Module on Volvo / Mack engines? (3-minute read)
Read more
Your Cummins has a 5 MPH DEF Derate (SPN 5246). What now?
What is Forced DPF Regeneration?
Paccar EGR Disabled triggered SPN 411 P1495 P1496 Explainer (3-minute read)
Common DPF Questions Answered!
What to do if Your Volvo D13 is Stuck in 5 MPH Derate (3-Minute Read)
SA 16 DTC Fault Codes Explainer Volvo | Mack
What Does ‘SCR NOx Conversion Efficiency Low’ Mean On Detroit Diesel DD13, DD15, DD16?
The Not So Distant Future
Intro to J1587 / J1708 Standard Fault Codes, Raw Stuff here
What is the Most Reliable Volvo Truck Engine and Why?
5 Common Inspection Tips
4.9 Stars | 500+ Google Reviews
Experience a new level of support with our focus on treating you how we would like to be treated.
Limited Lifetime Warranty
We value your investment in our product and want you to feel confident in its performance.
Discover how OTR Diagnostics simplifies your truck's maintenance and prevents expensive future problems. Start now and take control!