Medium and Heavy Trucks

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Related Medium and Heavy Trucks Questions
I have a c15 cat. Replaced the batteries but now all it does
I have a c15 cat. Replaced the batteries but now all it does is crank and won't fire. I have key on power to pin 70 but nothing on pins 52 and 53? … read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade School
205 satisfied customers
Have a cat D 5B that started and ran fine a few weeks ago
Have a cat D 5B that started and ran fine a few weeks ago now won't even try to start has always fired up immediately so we discovered it was basically out of fuel although filters still had fuel in t… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
10,055 satisfied customers
Got a real bad one ben in the truck repair since 1979 got a
got a real bad one ben in the truck repair since 1979 got a 2004 pete with a cat bxs it only starts when hot we have found that the b port on the diagnostic plugin in the truck only has .440 volts and… read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade School
205 satisfied customers
I would like help determining if I have a computer failure
I would like help determining if I have a computer failure or wiring harness failure. The vehicle is an 04 Sterling serial number 2FZHAZAS34AM65020. The engine is a C12 Cat. Ser. Number MBL 12394. The… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,114 satisfied customers
I have a Ford 641 that stopped running - at first it was
I have a Ford 641 that stopped running - at first it was running fine, then when i fixed the fuel shut off under the gas tank, it began to shut off after a few minutes, then completely quit. I've clea… read more
Curtis B.
Curtis B.
Technician
Associate Degree
1,270 satisfied customers
C15 acert in 9900 int crank no start, Changed batteries,
Volt oilpr watertemp rpm and speedom not doing right after ign on… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,114 satisfied customers
I have a 1997 Louisville Dump with a 3126. I am installing a
I have a 1997 Louisville Dump with a 3126. I am installing a motor from a 99 Sterling 3126. I have the 40 to 70 pin adapter but get no power to my ecm Plug. I have checked power coming direct from Bat… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,114 satisfied customers
I have 2003 peterbilt 378 with a c15 cat,unit turns over but
i have 2003 peterbilt 378 with a c15 cat,unit turns over but will not start,put ecm on a different truck,ecm ok,checked all power supply wires are ok i have a ck engine light but can not ,get into ecm… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,114 satisfied customers
C15 acert cut off going down road, will turn over but wont
C15 acert cut off going down road, will turn over but wont start. ET will not communicate with ECM. Has battery power for laptop but wont connect. Has ignition power at ECM but doesnt have ignition po… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,114 satisfied customers
06 kw t600 c15 replaced all 4 batterys. Turned key went
06 kw t600 c15 replaced all 4 batterys . Turned key went through start cycle but still had clicking in engine compartment. Engine spins over but will not start. When open door dash comes up shows mile… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,114 satisfied customers
I have a cat 3126 8yl45592 in a freightliner fl80. Truck was
I have a cat 3126 8yl45592 in a freightliner fl80. Truck was running fine-parked it and two weeks later cranks but no start. Serviced engine oil and fuel filter. Put it on a scan tool and got no ecm c… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,114 satisfied customers
i have a 2000 freightliner with c-12 engine. The problem I
i have a 2000 freightliner with c-12 engine. The problem I am having is that it will crank over but not start. when this happens the check engine light does not come on. It is sporatic but getting mor… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,114 satisfied customers
Im working on a 2002 freightliner with a c12 in it that cranks
I'm working on a 2002 freightliner with a c12 in it that cranks and will not start. codes are 91-8 throttle position invalid and 232-4 5 volt supply voltage low. I go through all the tests and it says… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,114 satisfied customers
I have a 1995 freightliner fld it had a 3406 e engine I change
I have a 1995 freightliner fld it had a 3406 e engine I change that motor to a c15 I had to used a harness adapter . The engine will run off of start fluid but once it is gone it dies out . I don't th… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,114 satisfied customers
97 FL70 with a CAt 3126 wont start. Has fuel new batteries.
97 FL70 with a CAt 3126 wont start. Has fuel new batteries. Where is the ECM physically located to check for power on pins 52,53,and 70… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,114 satisfied customers
I am working on a CAT-NXS 20681 we did replace the ECM and
I am working on a CAT-NXS 20681 we did replace the ECM and we now have no engine codes. However it will still die occasionally. It will usually die when you go full throttle an then let it completely … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,114 satisfied customers
I am upgrading my 90 KW truck from the early (3176) 40 pin
I am upgrading my 90 KW truck from the early (3176) 40 pin rectangle ecm plug to a 2002 70 pin C-12. The ecm plug that came with the takeout engine only uses to of the 101 power inputs in ports 52 and… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,114 satisfied customers
GM C6500: Changed starter 1998 GMC C6500 7.2 Cat Key switch
Changed starter 1998 GMC C6500 7.2 Cat Key switch want turn starter on. Connections checked and are right. Starter turns over fine. Not getting power to starter relay. Checked fuses, breakers, relays.… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,114 satisfied customers
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Daniel Wilson

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Chris (aka-Moose)

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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