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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

DPF restriction, 2020 Freightliner
02/13/2025 in the HD/Fleet Forum
Hi HD, This Freightliner was brought in for regen issues. Cummins. Very good customer and very good maintenance program. Using Cummins Insite we determined that codes were being set for differential pressures in the DPF. We also observed high restriction ...
Diesel vs Gasoline fuel lines
02/10/2025 in the HD/Fleet Forum
Having to deal with a diesel tractor that has terrible contamination in the fuel system(tank) for some reason. After sealing with the tank- new or cleaned, I am thinking of replacing as many of the fuel lines with rubber hoses and new banjo fittings, in p...
Intermittant no start
02/04/2025 in the HD/Fleet Forum
[Driveability: 20 Freightliner M2 112 8.9L] Group, We've been struggling with this truck, eng died on the highway, towed in. It won't crank with the key. Trying to scan with TEXA, not having much luck. Info in Mitchell is incomplete. This morning the tru...
No Start No Com To ECM
02/03/2025 in the HD/Fleet Forum
[Electrical: 07 Mack CTP CTP700 10.8L] Have this truck, 2 months back the truck would not start. Came in with no hour reading on dash, no communication to ECM. Ended up starting randomly. Traced it down to a main plug on the driver side full of coolant, ...
2007 Dodge Ram Manual Transmisson Speed Sensor
02/03/2025 in the HD/Fleet Forum
[Electrical: 07 Dodge Ram 3500 ST 6.7L] I have a friend with this 07 Ram 3500 and a MANUAL transmission. I am trying to find the wiring diagram for a vehicle speed sensor and not having any luck. Truck is not here at the time. He is adding a radio an nee...

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