We don't have a lot of complaints on file for the GMC C4500 (although feel free to add yours here) -- it's either not very popular ... or it's very, very good.
The 2006 GMC C4500 has the most complaints, & the most-reported problem is also with the 2006 C4500 for excessive vibration at speeds between 43 to 48 mph.
Worst Reported Problems with the C4500
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Latest Owner Complaints About the C4500
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excessive vibration at speeds between 43 to 48 mph -- 2006 C4500:
The vechicle when driven at speeds between 43 to 48 mph transmits an excessive amount of vibration through the truck. We have installed all new tires all the way around the truck and installed new steel rims on the rear drive tires, and the vibration has decreased slightly but it still will ... Read more »
This problem has been reported 1 times by other 2006 C4500 owners.
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dual tanks with fuel gauge default to empty -- 2004 C4500:
I am a inter-provincially licensed mechanic in Canada. I am currently working on a 2004 GMC C4500 with fuel gauge defaulted to empty. The "TSB" for the breather tubes on filler necks did nothin' for the "PO" series code listed the "ECM". The "PO" code for the "fuel transfer pump insufficient ... Read more »
This problem has been reported 1 times by other 2004 C4500 owners.