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Related Medium and Heavy Trucks Questions
I have 99 gmc c6500 topkick with 3126 cat only start with
i have 99 gmc c6500 topkick with 3126 cat only start with starter fuel … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
I have an 2000 Freightliner FL70 with a cat 3126. When I do
Good day, I have an 2000 Freightliner FL70 with a cat 3126. When I do an air brake test a buzzer (I was told low oil pressure) stays on when I shut the engine down and turn the key back to on. I am ta… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
Have a 1990 GMC TOPKICK with a 3116 cat I trun the key off
have a 1990 GMC TOPKICK with a 3116 cat I trun the key off and eng. will no shut off … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
3126 cat motor, removed oil pan to replace it and found 2
3126 cat motor, removed oil pan to replace it and found 2 6mm x60mm allen head screws laying in the pan. where do they belong? … read more
james Roberts
james Roberts
Maintenance assistant
Vocational, Technical or Trade School
3 satisfied customers
I GOT 1 QUESTION I DONT NEED MONTHLY SUBCRIPTION. CAT 3126.
YES ,,FUSES LOOK GOOD DONT KNOW WHY LOW AIR WARNING LIGHT OR BUZZER NOT WORKING … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
580 satisfied customers
Got a 2001 gmc topkick with 3126 in it. Was running fine.
Got a 2001 gmc topkick with 3126 in it. Was running fine. Went to start long cranking. Had already run into bad inj actuation sensor couple weeks back. Fixed that. I unplugged the sensor again to test… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
3126 cat starts and dies or won't used to die a few time and
3126 cat starts and dies or won't used to die a few time and then fine. Just got back three thousand mile trip. Now won't start at all if does die like shut key off. Showing coax 71 49 34 … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
I have a 1990 gmc topkick with a 3116 engine. The truck
I have a 1990 gmc topkick with a 3116 engine. The truck starts up fine when cold. After a few minutes an alarm starts buzzing then it will die. It will then immediately restart, the alarm comes back a… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
I have a 3126 cat in a 7500 Chevy, drove to work just fine
I have a 3126 cat in a 7500 Chevy, drove to work just fine then when I tried to leave the starter ingauged but died. Now I have power when I turn my switch on and my chassis are clicking but no power … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
I HAVE A 2000 GMC WITH A CAT 3126, SOME DAYS IT WILL START
I HAVE A 2000 GMC WITH A CAT 3126, SOME DAYS IT WILL START AND RUN FINE THEN I WILL BE DRIVING 65 MPH AND IT DIES AS IF I TURNED THE KEY OFF. SOME TIMES IT WILL RESTART BEFORE I STOP. IF I CRANK ON IT… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
2000 GMC Topkick with 3126 Cat will not start without ether.
2000 GMC Topkick with 3126 Cat will not start without ether. Seems ok once its running but if you slow down to stop it will die and will not restart without ether. Replace the fuel pressure regulator … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
I have a gmc 7500 with a cat that has a electrical problem
I have a gmc 7500 with a cat that has a electrical problem to the engine. Do you have a real good gmc mechanic available at this time. … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
14,646 satisfied customers
I have a 2003 GMC 7500 with a 3126 cat, truck came in no
Hello, I have a 2003 GMC 7500 with a 3126 cat, truck came in no start no crank, could not communicate with ecm, checked power and grounds found all ok, replace ecm, now I can communicate with ecm and … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
I have one Man please. I have a 2000 GMC T-7500 Serial
Hi. I have one for Cat Man please. I have a 2000 GMC T-7500 Serial Number1GDL7C1C2J503507. It has a Cat engine #8YL91240. Driver shut it off Friday night, came in thismorning and it will not start? Tu… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
GMC c6500: I have a 2000 gmc c6500 and no start has a 3126
I have a 2000 gmc c6500 and no start has a 3126 cat. I also loose power to the pink wire at the brake light interface module can you tell me where it is located… read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade School
214 satisfied customers
I have an 02 sterling with a 3126. We dont use it much and
I have an 02 sterling with a 3126. We don't use it much and it has given us virtually no trouble. The other day, I shut it off and it wouldn't crank back up. It would turn good, but not hit. I took it… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
2000 GMC topkick with a 3126 cat engine. Shut off while running,
2000 GMC topkick with a 3126 cat engine. Shut off while running, will not restart. Checked voltage to ecm. 12 volts to pins 52 an 53 .I have 1200 psi. pressure in high pressure manifold while cranking… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
Chevrolet c6500: I have a 1998 topkick chevy truck 6500 series
I have a 1998 topkick chevy truck 6500 series 6 speed with a 3126 diesel cat motor,the speedometer,odometer and tach stop working..it runs but sputters going uphills,then it just seems like the pedal … read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
5,353 satisfied customers
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Meet the Experts:

Daniel Wilson

Daniel Wilson

14,646 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

5,353 satisfied customers

I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

5,115 satisfied customers

worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

Jeremy

Jeremy

Certified Truck/Bus Technician

2,756 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, Network Engineer specializing in CAN faults, Aftertertreatment, and vehicle communications

Curtis B.

Curtis B.

Technician

1,947 satisfied customers

Technician turned service manager on multiple lines of trucks and engines, used in industry.

cumminsdr

cumminsdr

Mechanic

1,886 satisfied customers

All types of Cummins applications

Chris (aka-Moose)

Chris (aka-Moose)

Technician

641 satisfied customers

24 years of experience diagnosing & repairing

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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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