× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network

Automotive HD/Fleet Forum

Professional automotive forum for discussion of heavy-duty trucks, buses and other on- and off-road equipment, and maintenance of automotive fleet vehicles. Discussion topics include fuels and lubricants, hydraulics, performance, on-board diagnostics, powertrain, power distribution, anti-lock braking and stability control systems, and best practices as they relate to heavy duty and fleet maintenance. This forum is for experienced automotive repair professionals only, membership required.

Continue to the description of our next automotive discussion forum, the HVAC Forum.

Recent Automotive Discussions in the Automotive HD/Fleet Forum

Speedo and Tach fluctuating
03/20/2025 in the HD/Fleet Forum
[Driveability: 07 GMC C5500 Topkick C5C042 6.6L] Group, I had previously posted on this truck a while back, issue was not resolved. While driving, the speedo and tach will intermittently jump around, sometimes individually, sometimes both. We had sent th...
2016 Frtlnr t370 8.0 python lpg engine, need data info
03/17/2025 in the HD/Fleet Forum
anyone have any live data info for a normal running engine? More specifically the fuel trim and o2 sensors readings. I have the original pdf files on this engine but they do not go into fuel trims nor o2 sensor reading. I have to use hdobdii scanner for t...
Crank No Start After Long Lay Up
03/15/2025 in the HD/Fleet Forum
[Driveability: 06 International 7300 7.6L] Greetings. Above unit is a 50ft bucket truck, 4wd. Truck ran when parked. Length of layup unknown. After new batteries installed, now a crank/no start. VIN [...] Visual: oil level, coolant level, fuel supply, fu...
Paccar KW Misfire DTCs
03/13/2025 in the HD/Fleet Forum
Hello everyone, We're working on a 2017 KW T370 with a Paccar 9 in it. VIN# [...]. We've had this repeated series of stored active DTCs: 5898- eng misfire cyl #4, 5899-eng misfire cyl #5, 5911- eng misfire cyl #6 and 5914- eng misfire multiple cyls for al...
Volvo Diagnostics
03/11/2025 in the HD/Fleet Forum
Good day Gentlemen, what would you recommend for Volvo Class 8 truck diagnostics? Volvo's own program is unbelievably unwieldy and a colossal expense for very little return. Looking for everyones input on this, as we usually stick to manufactures software...

Automotive Sponsored Discussion Forums