Medium and Heavy Trucks

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I am working on a 98 gmc c7500 with 3126 Cat that I could
I am working on a 98 gmc c7500 with 3126 Cat that I could not get started. I checked powers and grounds and I found o had no key switch power to pin 70. I jumped key switch power to that pin. Truck st… read more
Gary A.
Gary A.
Associates in Diesel Technology and Business Management
6 satisfied customers
Working on a 3126 cat in a 1998 chevy c7500. It cranks but
Working on a 3126 cat in a 1998 chevy c7500. It cranks but will not start. I have replaced speed sensors and harness. I have replaced ecm and verified grounds and power to ecm. I have replaced injecto… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
Working on a GMC 7500 2002 vin # ***************** has a
Working on a GMC 7500 2002 vin # ***************** has a 3126 cat. Truck was parked for a couple weeks and would not start. Tried to scan but we're not getting ecm to communicate. Looked in battery bo… read more
Mike Mcmillan
Mike Mcmillan
Triage Tech/Shop Foreman
Associates
571 satisfied customers
1999 freightliner fl60 with cat 3126. Will not start. Wait
1999 freightliner fl60 with cat 3126. Will not start. Wait to start light not coming on and scanner will not communicate with ecm. Unplugged wiring harness going to sensors to rule out a shorted senso… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
2001 Freightliner FL70 Caterpillar 3126 Serial# 8YL57090
2001 Freightliner FL70 Caterpillar 3126 Serial# ***** Instrument cluster says "no data" and all gaugues do not work except the fuel and air pressure gauges. Turn key on and gauges cycle. Start vehicle… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 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
571 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
Vocational, Technical or Trade Scho
10,344 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
2000 GMC Topkick, 3126 Cat. Check gauges light will flicker,
2000 GMC Topkick, 3126 Cat. Check gauges light will flicker, buzzer will sound. Engine will die, just like the ignition switch was shut off. Starts back fine. Any ideas? … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 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
6,062 satisfied customers
I have a 3126 and a c-7. 3127 came out of a 2003 6500 and we
i have a 3126 and a c-7. 3127 came out of a 2003 6500 and we put it in a 05 7500 that has a c-7. When we put the wiring and computer out of thr 3126 all the lights in the dash are on and runs like cra… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
What 3126 cat engines will swap with a c7acert in a 2007
What 3126 cat engines will swap with a c7acert in a 2007 freightliner M2, 280 hp? I understand the 3126 is more durable.… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I am working on and 06 Pete 379 with a Cat C-15 MXS24605.
I am working on and 06 Pete 379 with a Cat C-15 MXS24605. The truck came in with a no start concern, died while driving down a rough road. Driver states it has new batteries and alternator in the last… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
I have a 2005 gmc 7500 with a c7 cat and an Allison
I have a 2005 gmc 7500 with a c7 cat and an Allison automatic transmission. The guage quit working ( fuel, tack, speedometer, temperature, volts ). I know gmc is known clusters so I swapped out the cl… read more
Andy
Andy
truck /coach technician
Vocational, Technical or Trade School
214 satisfied customers
Hello have a 2003 F450 with a cat 3126 serial HEP22256 Check
Hello have a 2003 F450 with a cat 3126 serial HEP22256 Check engine light never comes on at all not even at KOEO. No communication with ecm with snap on pro-link- or et program. Unit just shut off dri… 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
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
10,344 satisfied customers
Hello, I have previously contacted one of your techs to attampe
Hello, I have previously contacted one of your techs to attampe to resolve an issue im having with a kenworth truck that has a c12 cat engine. We got to the point of sending the ecm away and getting i… read more
Cat Man
Cat Man
Cat Engine Expert
Vocational, Technical or Trade Scho
10,344 satisfied customers
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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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