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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

DD5 power issue
05/05/2026 in the HD/Fleet Forum
Not my buses, I don't run these but one of my association's member school districts is asking for help: Hi all! I hope everyone is enjoying this beautiful weather today. Is anyone having trouble with the DD 5 Detroit engines with fault codes for the high/...
Fuel Pump Control Module
05/05/2026 in the HD/Fleet Forum
[Driveability: 20 International CV515 6.6L] 2020 IH CV Series with a 6.6L. Bucket truck. Had cel on and fault code P129F, P12A6-both for fuel pump control module. Ceared codes but they came back that afternoon. The next morning the truck would not start....
2013 INTERNATIONAL selector switch codes
05/04/2026 in the HD/Fleet Forum
can any one give me some information on theses codes have serval of them in this truck cant find much information on them I'm guessing they are in the body control Vin number [...] SPN: 2796 - Transfer Case Selector Switch FMI: 2 - Erratic, Intermittent, ...
Ford Ecoboost 3.5 turbo coolant lines
04/30/2026 in the HD/Fleet Forum
We haven't had the pleasure of dealing with the cooling lines on the turbos yet, but I'm sure that's coming up. I have heard that is a real challenge getting the lines pushed back in the quick fitting. I see where there is an aftermarket setup that uses A...
No Crank Communication Errors
04/28/2026 in the HD/Fleet Forum
[Electrical: 17 Freightliner M2 106 8.9L] Good Day Techs. First I would like to commend you Truck/Coach technicians for the work you do with such poor information services. I do not normally work on commercial vehicles so this has been rough so far, I ha...

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