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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

Watson Chalin pusher axle
09/13/2025 in the HD/Fleet Forum
[Miscellaneous: 08 Kenworth T800 15.8L] I need info to help diagnose a Watson Chalin pusher axle with auto raise in reverse. I have tried through KW and parts contacted PACCAR for help. Wanted to replace valves but received incorrect ones. Pulled 3 valve...
Truck - bus salvage yards
09/10/2025 in the HD/Fleet Forum
[Miscellaneous: 11 IC Corporation CE School Bus 7.6L] Good day, Here in NJ we live in the "lower rust belt". In recent years I've seen rust and corrosion damage increase very noticeably. My guess is a pronounced increase in brine use plus crappier surfac...
Freightliner/Thomas bus brake lights staying on
09/08/2025 in the HD/Fleet Forum
2009 Freightliner/Thomas SAF-T-Liner C2 (Curved one-piece windshield) All four brake lights at the rear of the bus are staying on. With DDDL software, I can see they are being commanded on. If I unplug the brake light switch, which is part of an air modul...
KW T270 Green Battery Light?!?
09/05/2025 in the HD/Fleet Forum
[Electrical: 18 Kenworth T270 6.7L] Have this vehicle, green light is on the dash. Can not seem to understand what it is for. Kenworth manual says it is "Cab Status" Illuminates when the cab power is ON. Only thing i see in ESA is under switch LDV says o...
Autel 908CV
09/04/2025 in the HD/Fleet Forum
So I have a MS908CV Autel and its been pretty helpful most of the time and it has gotten me through a lot of jams but the other night it would barely connected to a 2022 KW and would identify the vin and show me that it did have active fault codes however...

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