× 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

pirelli vs sumitomo
10/01/2026 in the HD/Fleet Forum
12R-22.5 truck tires Pirelli vs Sumitomo anyone have opinions on which may be a better tire? Application rear/drive dump truck used for snow plowing, it sits most of the year and only get used maybe 100 miles per year. And quad chains go on it. Not much i...
2020 KW T880 idle speed
10/01/2026 in the HD/Fleet Forum
Hi HD, Cummins ISX 15 in this 2020 T880. All systems appear to be functioning properly. However, if the system is running a passive regen it is increasing the idle at all times, including in gear. Therefore the truck is pulling through a stop sign. If no ...
how to reset kw control head
09/28/2026 in the HD/Fleet Forum
2022 t480 hvac system ? anyone know how to reset the control head on the dash. I have replaced the recycle door actuator and the control head but the system still loops the recycle door every minute and half. the control head is part # f21-1048-11012e day...
ISB 6.7 Cummins motor swap
09/28/2026 in the HD/Fleet Forum
2018 Freightliner . The motor we have has the large-size crank sensors on front of motor. The motor that was sent to us has the small size sensors can we change the plugs as both are 3 wire. we have not done many used motor swaps with this configuration. ...
Hino L6 tire size change?
09/11/2026 in the HD/Fleet Forum
Has anybody done this yet? I've got a 2024 that came with 11R22.5 tires. We want to downsize that a little bit. It's a flatbed wrecker, dock height is not beneficial. I'm wondering if the size update happens in Cummins, Hino, Both?

Automotive Sponsored Discussion Forums