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Related Medium and Heavy Trucks Questions
Looking to take out a 7 speed manual out of a c7500 and
Hello, looking to take out a 7 speed manual out of a c7500 and replace it with an allison off of a 3116 cat, but I have a 3126 cat. just looking for positive confirmation that the back of the engines … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
591 satisfied customers
1998 c6500 GMC top kick with a 3126 cat and manual
1998 c6500 GMC top kick with a 3126 cat and manual transmission. Looking for a wiring diagram for the instrument cluster … read more
Andy
Andy
Truck Diagnostic Technician
Vocational, Technical or Trade School
3,030 satisfied customers
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
591 satisfied customers
Customer presents a 2003 GMC VIN- ***************** with a
Good Morning, Customer presents a 2003 GMC VIN- ***************** with a Cat 3126 ESN- HEP18041. Customer states Oil Pressure, Battery Voltage, Engine Temp and Fuel gauges are INOP. Customer further s… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
591 satisfied customers
I am having the same exact issue. 02 gmc c6500 cat 3126
02 gmc c6500 cat 3126 crank no start or start and sputter out. Flash codes 58 72 73 74 … read more
Cat Man
Cat Man
Cat Engine Expert
10,344 satisfied customers
How many miles does a 3126 cat engine get up to before they
How many miles does a 3126 cat engine get up to before they tap out on average? Looking at a sweet deal on a c6500 but the miles are pretty high it has no blowby, no leaks it runs good. But I still pl… read more
Keiphun Sowell
Keiphun Sowell
Owner Brothers Restoration/Troubleshoot
AutoDiesel Technology
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I have a 1999 c6500 that i believe has an allison at545 that
I have a 1999 c6500 that i believe has an allison at545 that i recently purchased I had not owned an allison of these years it just seems like it shifts too late around the 2200 rpm range is there any… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
591 satisfied customers
1998 c6500 with allisson 545 not downshifting installed new
1998 c6500 with allisson 545 not downshifting installed new solenoid but still no downshift… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
591 satisfied customers
I have a 2000 GMC C6500 with a 3126 just did the brakes and
Good evening sir. I have a 2000 GMC C6500 with a 3126 just did the brakes and suspension then went to start it and it will not run. It turns over fine just won't fire. Any ideas? … read more
Cat Man
Cat Man
Cat Engine Expert
10,344 satisfied customers
Have a 8/98 CHEV C6500 7.2L Cat. Have no voltage to start
Have a 8/98 CHEV C6500 7.2L Cat . Have no voltage to start relay coil. Have it coming from switch on yellow wire.And the fast idle isn't working. Have power to switch. The aux brake motor had shorted … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I need to find out where the fuel pump is located on a 2000
I need to find out where the fuel pump is located on a 2000 gmc c6500? … read more
Cat Man
Cat Man
Cat Engine Expert
10,344 satisfied customers
I have 3126b cat some time driving i would get 70 miles and
Hi My Name is ***** ***** have 3126b cat some time driving i would get 70 miles and it would drop to 55 mile this is happening every day new turbo no code … read more
Cat Man
Cat Man
Cat Engine Expert
10,344 satisfied customers
7/99 Chevy C6500, need wiring diagram, has a Cat 3126,
7/99 Chevy C6500, need wiring diagram, has a Cat 3126, manual transmission. Serial # 1GBJ6H1C5YJ500112 Thanks Clay… read more
Cat Man
Cat Man
Cat Engine Expert
10,344 satisfied customers
3126 cat in a 1999 GMC topkick C6500, I made a swap and I
3126 cat in a 1999 GMC topkick C6500, I made a swap and I need the full ecu wiring, … read more
Cat Man
Cat Man
Cat Engine Expert
10,344 satisfied customers
I am looking at a 1999 c6500 GMC truck with a CAT 3126 engine
I am looking at a 1999 c6500 GMC truck with a CAT 3126 engine (SN 7a531378). Are there any known problems with this engine? Currently the engine has 86,000 miles.… read more
Cat Man
Cat Man
Cat Engine Expert
10,344 satisfied customers
2003 GMC c6500 runs fine, no communication on data link. CAT
2003 GMC c6500 runs fine, no communication on data link. CAT 3126, Allison auto, hydraulic abs. I use both nexiq USB link or CAT adapter II with all OEM softwares. My equipment connects to every other… read more
Travis A. Wells
Travis A. Wells
Truck Mechanic
Associates of Applied Science
15 satisfied customers
We have a 2004 freightliner school bus, cat 3126 Allison 2000
We have a 2004 freightliner school bus, cat 3126 Allison 2000 trans.......the brake pedal is intermittently hard to push, also the trans will not upshift intermittently, both things started at the sam… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
I have a 1999 GMC C6500 with a 3126 Cat that will not start.
I have a 1999 GMC C6500 with a 3126 Cat that will not start. Cranks fine, Check engine light comes on and shuts off, has 4000 PSI Hydo pressure and fuel pressure bounces between 20 and 25 PSI at the p… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
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Meet the Experts:

Daniel Wilson

Daniel Wilson

6,062 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

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I am ASE Master Truck Certified.

Wayne

Wayne

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

Jeremy

Jeremy

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Curtis B.

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cumminsdr

cumminsdr

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All types of Cummins applications

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Chris (aka-Moose)

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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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