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

	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 ...
	2022 M2 Brake Lights 07/04/2025 in the HD/Fleet Forum Hello We have a 2022 M2 automatic. air brakes with 6.7 cummins. The brake lights stay on all the time . We have tested all the air switches behind the dash. We have check the hand brake , brake controller and the trailer socket and cant see anything. We h...
	FICM connector issues 06/24/2025 in the HD/Fleet Forum [Driveability: 05 Ford Excursion Eddie Bauer 6.0L] Needed to replace the ficm, and the lock tabs were broke. Did what I could, but now,Thanks!it dies and won't crank at times-get the 105 code. It does run and start at times, but I think that the front co...
	ISUZU NPR with Diesel 06/23/2025 in the HD/Fleet Forum I have a customer looking at some used 2018 NPR Chassis. They have the 4HK1TC engine with Allison 2550 RDS engines. Miles are 95,000 to 115,000. I see these around but don't know a thing about them. My main question is, what is the normal lifespan for the...
	QLS Blues 05/30/2025 in the HD/Fleet Forum Hi Everyone, Happy Friday! I have a 2017 Freightliner M2 Grade all for a local city here. It has a failed QLS and are on backorder for 2-3 months. P#04-35960-000. NO ONE in the country has one. Does anyone know what exactly goes wrong with them? Can somet...

Automotive HD/Fleet Forum

Recent Automotive Discussions in the Automotive HD/Fleet Forum

Automotive Technical Discussion Forums

Automotive Non-Technical Discussion Forums

Automotive Sponsored Discussion Forums