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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

K-Line Diag on 24v Modules
11/25/2025 in the HD/Fleet Forum
[Electrical: 14 Kenworth K370 6.7L] Have this K370 Euro 5 vehicle, truck will not start, ground from VIC3-L drops out to start relay when attempting to crank. Try scanning the truck with Davie4 and no come to any K-line modules the cluster and abs module...
No Crank
11/25/2025 in the HD/Fleet Forum
[Electrical: 16 Blue Bird All American FE AAC2810-3006 6.7L] Have this blue bird bus, truck would run and drive by jumping the starter. Ground signal was coming from key switch into the body module but nothing out. Disconnected the module load tested pow...
Rv trans stuck in service mode
11/25/2025 in the HD/Fleet Forum
One of my buddies parked his 1993 turbo diesel RV with an Allison transmission. Apparently there's a button on the shifter that puts the transmission into a diagnostics or service mode. Well after owning it for ten years he decided he wanted to push that ...
2002 internatioal map sensor
11/17/2025 in the HD/Fleet Forum
super dumb question where is the map sensor , I can see it on the scanner but can not find it . intermit Ly blows white smoke withy code spn611 fm114. Vin #[...] this truck has not been serviced in a long time ,filter screen was stopped up also. All groun...
Remote start for 24v systems
11/07/2025 in the HD/Fleet Forum
Does anyone know if/where to get the best remote start system for 24v equipment? I am wanting to incorporate it onto a Grove 40 ton picker . I am for now thinking out loud and I would like some input.

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