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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

APU Units For Ram 5500s?
08/06/2025 in the HD/Fleet Forum
Have a large university here in NYC, they keep receiving idle fines (Funny enough their own students are sending in the videos and getting rewards for sending these in). Question is they are asking about APU units, my question is would that even work for ...
Exhaust engine trans brake
08/05/2025 in the HD/Fleet Forum
[Brakes: 15 International 7400 9.3L] Intermittent exh/trans/engine retarder operation, per customer on a fire truck. Sad part is I do not have info enough to figure it out. Test drove and could not get retarder system to work at all. Any info to help dia...
Transmission won't shift
07/30/2025 in the HD/Fleet Forum
[Transmission: 21 Peterbilt 337 6.7L] Group, This truck is here for unrelated work but now in our shop it won't shift . Allison 2000 series trans We have a flashing service light on the shift control but no active codes. I am using TEXA to scan Any advic...
ISL9 CM2350 L101 Two DEF Tank Temps
07/29/2025 in the HD/Fleet Forum
[Driveability: 16 Kenworth T370 8.9L] Have this truck, and can not seem to figure out why the ecm is showing QLS sensor data, the tank does not have the sensor. Only sensor is the DEF tank level and temp sensor, which reads correctly in insite and is not...
No crand, no start
07/10/2025 in the HD/Fleet Forum
I have an older Ghel 7810 skid steer with a no crank no start problem. I can jump the starter and it cranks and runs. However, none of the controls work, so it will not move forward or backward, the hydraulics do not function. I think there is probably a ...

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