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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.

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Recent Automotive Discussions in the Automotive HD/Fleet Forum

hazard lights inop
06/26/2017 in the HD/Fleet Forum
[Electrical: 05 Ford F650 5.9L] this is one of our tow trucks, the oldest one in the fleet and the hazards do not work, windshield wipers and the turn signals work. I've been through the electrical and found that one pin on the back of the multi-function...
No Trans Light
06/26/2017 in the HD/Fleet Forum
[Electrical: 12 Freightliner M2 106 6.7L] VIN#[...] AUTO Trans Is on and truck will not turn over. In the past my techs have pulled fuses and I hear replace a few for this concern. I know little about systems. Any info about this concern and or how the s...
Torque spec for filter housing pressure reg?
06/23/2017 in the HD/Fleet Forum
Hi all, need to replace this and can't find the torque spec. for some reason our computer will no longer read the cd that came with the truck. If you have the spec, that would be helpful. Thanks.
2010 kenworth t300
06/22/2017 in the HD/Fleet Forum
Hi gang, One of our wreckers is down again with transmission problems. While we don't do anything in the medium/heavy duty area, I would like some input on software/hardware questions. It has an allison 2400 in it and has codes, but my generic hd code rea...
Synthetic codes
06/22/2017 in the HD/Fleet Forum
OK, what exactly is a "synthetic" code? Is the jargon for "we don't know"? I have an intermittent J1939 communication bus 70001 combination fault code that's listed as synthetic. Followed the trouble tree to "clear the codes and return unit to service, th...

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