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Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 8629
Experience:  I am ASE Master Truck Certified.
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I have 2 active codes in my 2008 kw with a c13 cat. One is

Customer Question

I have 2 active codes in my 2008 kw with a c13 cat. One is 84-14 & 524-9. When I get in a long hard pull it starts to buck. Is it related?
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Cat Man replied 1 year ago.
Hi. Thanks for asking your question and requesting me! I will try and help you out.
84-14 is defined as a Quick stop occurrence. This code occurs when a vehicle speed drops very fast. This can be caused by a vehicle speed signal problem.
524-9 is defined as Transmission Selected Gear : Abnormal Update Rate. This code comes form a J1939 signal problem. Most likely a vehicle speed signal.
These codes could indicate a vehicle speed problem. When these occur the engine may begin to buck and run rough. I would have the vehicle speed input form the trans looked at. Most likely a faulty vehicle speed sensor.
Please reply back if you need more help or have more questions. I am happy to assist.

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