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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

Freightliner Argosy Headlights
10/11/2019 in the HD/Fleet Forum
We are having a problem with this 07 Argosy having an intermittent loss of the right side headlight. Vin # [...] The dash lights go out at the same time as the right side headlight. We have switched left and right headlight relays and circuit breakers, bu...
Horton Fan Clutch
10/11/2019 in the HD/Fleet Forum
Hi Everyone, Have a 2012 M2 ESN [...] with a Cummins ISB 6.7? It has an air operated Horton fan clutch. The complaint; fan is always on. According to the schematic, the ECM controls the air solenoid both power and ground. When air is applied, the clutch i...
09 Dodge Cummins VIN L
10/11/2019 in the HD/Fleet Forum
Doing mobile diagnostics, I'm increasingly getting into technician/customer issues. I'm not a Cummins expert, but do need some advice on how to proceed. This is a ranch truck, 09 Cummins VIN L 3500. It was parked most of the winter, then used to haul a tr...
Diesel hydrogen cleaning program
10/09/2019 in the HD/Fleet Forum
Diesel hydrogen cleaning program has any one heard of this to do to def systems ?
isuzu 2016 5.2 liter diesel
10/08/2019 in the HD/Fleet Forum
fitting part number to check fuel pressure at the banjo fitting ? will cummins fitting work ? launch millenium hd scanner wont communicate to see fuel pressure.

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