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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

2008 CAT C-13 Power loss
05/22/2018 in the HD/Fleet Forum
[Engine: 08 Peterbilt 365 12.5L] Good morning, The issue that I am having with this truck is, when test driving the truck within 3 miles of highway speed roughly 70 mph the engine will begin to slowly loose power until you can only maintain a speed of a...
Trans Harness
05/21/2018 in the HD/Fleet Forum
Replacing the trans harness (truck side) on this 2003 Int'l 4300 [...]. Have SPN 639, FMI 14. Having trouble making the new harness work. New harness has a pink wire that has 12v ign pos. Not getting any help from International. Got a 'Ck Electrical Syste...
John Deere DTC help
05/21/2018 in the HD/Fleet Forum
I sure need some help diagnosing a customers John Deere 6125 tractor. It displays an ECU 641.07 code which translates to "Turbocharger actuator self calibration error. Active Exhaust Filter cleaning unavailable. Continued operation will result in loss in ...
UD 3300, DTC Help
05/18/2018 in the HD/Fleet Forum
[Driveability: 13 UD 3300 7.0L] Working on a 2013 UD 3300 and have some DTC's and can not find repair info on them. Any help please PPID35 FMI 0 EGR Mass Flow Data Valid But Above Normal Operational Range SID 2 FMI 7 Unit Injector 2 Mechanical System Not...
2014 Isuzu NPR HD GAS AC
05/18/2018 in the HD/Fleet Forum
this truck has the 6L Chevy gas motor. I am trying to replace the leaking AC compressor. I can't find a compressor application listing for this truck. Thanks for looking.

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