Medium and Heavy Trucks
Connect one-on-one with a technician who will answer your question
Expert avatar
Daniel Wilson,
2,838 satisfied customers
Owner at DJ Wilson
Pearl avatarPearl Wilson, Assistant
Technicians are Online Now

Have truck repair questions? Ask an Expert

Verified technicians are online around the clock and ready to answer your question online or by phone. 
Related Medium and Heavy Trucks questions
Keeps giving code 5848. Kenworth 2014 W900L. We had a
We had a technician look at it and clear codes but code came right back … read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,322 satisfied customers
I have the same issue but with a MBE 900, SID 053 Fail 11
Hi, I have the same issue but with a MBE 900, SID 053 Fail 11 came out on the dash. Do you have a diagram where the egr mixing valve is on the 900 series engines? … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
2,838 satisfied customers
I have as a project a loaned 963 cat loader, for the fall
I have as a project a loaned 963 cat loader, for the fall diesel engine class, the owner loaned it for repair to our class, supposedly an acert 7.1 cat engine, for some reason bad fuel got by all thre… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
2,838 satisfied customers
I've got to two Cummins QSB 5.9 450 HP Engines installed on
Hi. I've got to two Cummins QSB 5.9 450 HP Engines installed on a boat. One of them is running at 650 RPM, but the other one rev's around 600. How can I adjust the one running at 600 to rev up at the … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
2,838 satisfied customers
I have a 2007 international 9400i that is lossing power. We
I have a 2007 international 9400i that is lossing power. We recent just replaced fuel filters about 30 miles ago. What do you think the problem could be?… read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade Scho
222 satisfied customers
I am purchasing a 1998 Sea Ray boat with 3126 Cat Motors. I
I am purchasing a 1998 Sea Ray boat with 3126 Cat Motors. I believe they are 420 hp each. Do these motors have a diagnostic port? If so is it unique to Cat or is it OBD 2? … read more
cat_engines_only
cat_engines_only
Field service technician
Vocational, Technical or Trade Scho
1,287 satisfied customers
Looking for 1994 GMC auger boom truck service manual serial
looking for 1994 GMC auger boom truck service manual serial #(###) ###-####… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,322 satisfied customers
Last Friday (8/03) one of our drivers notified me that his
Last Friday (8/03) one of our drivers notified me that his 2006 Peterbilt 379 dump truck suddenly lost power while in transit and shut down completely. Although he was able to restart the Caterpillar … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
4,568 satisfied customers
I have a 2007 Ford Explorer Eddie Bauer V6. (55,000 miles)
I have a 2007 Ford Explorer Eddie Bauer V6. (55,000 miles) My concern is regarding battery drain when the car is not in use. It has always been that if the car sits for 2-3 days without use it will re… read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,031 satisfied customers
2005 autoshift replace the computer. Used came out of a
2005 autoshift replace the computer. Used came out of a manual trans truck. Was working fine speedometer just wasn't working. … read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,322 satisfied customers
2015 8.3 cummins turbo diesel with 9,080 original miles and
2015 8.3 cummins turbo diesel with 9,080 original miles and I have zero throttle response , will not go over 10,000 rpm. … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
2,838 satisfied customers
I'm still having the problem with the controls and dash on
I'm still having the problem with the controls and dash on our D6T... I replaced everything that was corroded on the back of the fuse box now the problem is worse the air pump for the seat doesn't wor… read more
cat_engines_only
cat_engines_only
Field service technician
Vocational, Technical or Trade Scho
1,287 satisfied customers
I was talking to you yesterday have code 3487-7, have
I was talking to you yesterday have code 3487-7 , have replaced the cylinoid and pressure differential sensor for air inlet, and ard head. Can not get it even try to do a burn. it is s/n lee20211 … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
2,838 satisfied customers
1999 Mitsubishi Fuso 5.9L Turbo diesel engine I need a good
1999 Mitsubishi Fuso 5.9L Turbo diesel engine I need a good place on line where I can buy a quality rebuilt engine parts. Please note this is a big truck, a regular online stores don't sold parts for … read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,322 satisfied customers
3406e caterpillar 1998 receiving codes check engine light
3406e caterpillar 1998 receiving codes check engine light on … read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,322 satisfied customers
Have a M-11 that loses prime and stalls after starting
have a M-11 that loses prime and stalls after starting (after manual prime), sometimes does not even start … read more
Steven
Steven
Triage Tech/Shop Foreman
Associates
11 satisfied customers
Getting CEL, code U02A2. 2015 RAM 3500 6.7 Cummins
Code U02A2 will not clear / dealer stated bad DEF Quality sensor, vehicle needed new DEF tank because sensor was part of tank / new tank installed, same code / dealer now says ECM is bad, needs to be replaced because it has the wrong software loaded and it is locked, they can't program so it has to be replaced / technician with access to Witech 2.0 hooked up to ECM last night, ecm not locked as we downloaded software again, Witech 2.0 says Current part number 32370631AI, ECU Status: Up to Date … read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,322 satisfied customers
Having a loss of power. Maxxforce 13 2012 prostar. Put
put computer on it changed filter, works great on startup then after I get a couple miles I have loss of power hard. takes a while to pickup speed … read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade Scho
222 satisfied customers

Common medium and heavy truck questions resolved on JustAnswer


Before you ask the expert your question you'll need to know the make and model of your truck, and have the manuals and equipment logs ready.


The medium and heavy truck expert will also need to narrow down the problem to a specific component. To do this, they'll need a solid understanding of the symptoms of the problem.


Some of the other things an expert is likely to ask you about include:


  • What are the symptoms of the problem?
  • Are there any additional problems in other related systems?
  • What were the conditions when the problem occurred?
  • When and how frequently does the problem occur?

With this information, a medium and heavy truck expert should be able to diagnose the issue and help you to find a solution.