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Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 8617
Experience:  I am ASE Master Truck Certified.
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I have 2004 Frieghtliner m2 cat engine c7 I replaced the

Customer Question

Hi I have 2004 Frieghtliner m2 cat engine c7 I replaced the engine to 3126 it's running perfect but the speed odemetor and the oil prusure is not working also the temp show high temp show high
JA: What's the make/model/year of your truck? Engine type?
Customer: 2004 Frieghtliner m2 106 the new engine on it now is cat 3126
JA: Anything else you want the truck mechanic to know before I connect you?
Customer: No thanks
Submitted: 5 months ago.
Category: Medium and Heavy Trucks
Expert:  Cat Man replied 5 months ago.
Thanks for asking your question. I will try and help you out.
Expert:  Cat Man replied 5 months ago.
The 3126 ecm is most likely programmed different than your C7. I've seen this many times.
Lost all 3126 engine also do not come with an oil pressure sensor. To get this to work, you would need to install one and program the ecm to acknowledge it.
The speedometer parameter will need to be changed. There are several ways this can be programmed. It can be wired direct or obtained from the trans via J1939. I would check the C7 programming and make sure it matches.
Please reply back if you need more help or have more questions. I am happy to assist.
Expert:  Cat Man replied 4 months ago.
Hey. I just wanted to see how things were going. Please let me know if you need more help. I am happy to assist. If my information was helpful, please leave a good or higher rating so that I receive credit. Thanks.

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