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Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 8863
Experience:  I am ASE Master Truck Certified.
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9-8 code on dash of 378 peterbilt 2005 c15 avert engine, I

Customer Question

9-8 code on dash of 378 peterbilt 2005 c15 avert engine
JA: What is the complete model and serial number of your machine?
Customer: I don't know this is for a friend, he is 700 miles north
JA: Are you fixing this yourself? What have you tried so far?
Customer: He pulled over and shut down , checked what he could than fired up and light stayed off at that point
JA: Anything else you want the equipment mechanic to know before I connect you?
Customer: Not that I can think of
Submitted: 9 months ago.
Category: Medium and Heavy Trucks
Expert:  Cat Man replied 9 months ago.
Thanks for asking your question. I will try and help you out.
Code 98 is defined as an engine coolant diverter valve fault. I see this a lot. There are two things that can cause this code.The first and most common is a damage wiring harness. Many times it gets hot due to the location near the turbos. Over time the heat damages the wiring.
Second is a faulty coolant diverter valve.Please reply back if you need more help or have more questions. I am happy to assist.
Expert:  Cat Man replied 9 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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