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Gmc t7500 had a 3126 cat that was knocking swapped it with
Gmc t7500 had a 3126 cat that was knocking swapped it with another c7500 cat 3126 parts truck I had & now i have some codes I'm not too familiar with. 253-2 & 253-14. I tried programming the ecm to gm… read more
SteveR
SteveR
Shop Manager
High school
6 satisfied customers
Got a new ecm for 05 gmc c7500. After install, key does not
Got a new ecm for 05 gmc c7500. After install, key does not turn starter,and fuel gauge doesn't work. Reinstalled old ecm, key start works again and fuel gauge works … read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
604 satisfied customers
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
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I have a CAT 3126B in a Fl70 And I want to check the Check
Good morning, I have a CAT 3126B in a Fl70 And I want to check the Check engine light codes. But my cruise control doesn't work.… read more
Gary A.
Gary A.
Associates in Diesel Technology and Business Management
8 satisfied customers
I am working on a 1998 GMC C7500, with CAT 3126, No cruise
I am working on a 1998 GMC C7500, with CAT 3126, No cruise control. Truck will start when it wants to and will run for 30 min. and shutdown, like someone turned the key off. Check engine flashes. I ca… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
5,115 satisfied customers
I'm wanting to swap out my 8yl 3126 out of 2000 c7500 I want
I'm wanting to swap out my 8yl 3126 out of 2000 c7500 I want to put in ckm 2002 3126 for more power Don't know if I use old ecm or new on because for gauges ect … read more
Nich1019
Nich1019
Diesel Technician
Vocational, Technical or Trade School
80 satisfied customers
1999 C7500 CAT 3126. THE COMPUTER FRIED. I installed a reman
1999 C7500 CAT 3126. THE COMPUTER FRIED. I installed a reman one programmed to my engine serial #. The engine starts and runs for about 30 seconds and shuts off. I connected my cheap scanner and it is… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
604 satisfied customers
2003 f650 3126 cat died wont start check engine light does
2003 f650 3126 cat died wont start check engine light does not come on now communication with cat et, have power and ground to ecm and ignition hot on pin 70, replaced ecm with reman from cat still ca… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 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
10,344 satisfied customers
2001 GMC T8500 with CAT 3126, intermittent check engine
2001 GMC T8500 with CAT 3126, intermittent check engine light, engine loss of power after running for aprox 1 hours. Can not connect with Prolink Ultra, can not see any modules on the network. No wiri… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I have a 2005 gmc c7500 with a cat motor (c7)? It down rates
I have a 2005 gmc c7500 with a cat motor (c7)? It down rates at about 60mph for about 5-10 seconds with dash lights dropping speed until about 40mph and then runs fine. What's the deal with that?… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I have a 2006 Chev C7500 with a Cat C7 diesel engine. Is
I have a 2006 Chev C7500 with a Cat C7 diesel engine. Is there a way for me to check the error codes on this unit?… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Me again. Wired up timing sensors (soldered ). Truck cranks,
Me again. Wired up timing sensors (soldered ). Truck cranks, you can hear things clicking in engine department with key on, never fires. I figured timing sensors and wiring was my problem but still no… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
1999 GMC C7500 3126 Cat. Occasional hard start. "No ECM
1999 GMC C7500 3126 Cat. Occasional hard start. "No ECM detected" when hooking up scanner.… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
i have a 2002 chevy kodiak c 7500 with a cat 3126e i cant
i have a 2002 chevy kodiak c 7500 with a cat 3126e i can't find the 9 pin datalink connector it has the standard gm aldl connector i need to hook up a cat et scanner… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
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
Hello Cat Man. I have a 2002 Chevrolet C8500 with a Caterpillar
Hello Cat Man. I have a 2002 Chevrolet C8500 with a Caterpillar 3126B engine. I can't seem to find a way to hook a scan tool up to check for DTC's. The truck has an OBD2 data link connector but I can'… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Hello, I have a Cat C7 on a 2007 Ford F-750. Engine serial
Hello, I have a Cat C7 on a 2007 Ford F-750. Engine serial #C7S06381. Particulate trap had to be baked and shaked and reinstalled. Now the truck starts (improvment) but it is in derate. Hooked up a sc… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 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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ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, Network Engineer specializing in CAN faults, Aftertertreatment, and vehicle communications

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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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