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Bought a GMC 2500HD with 6.0 in 2010. For next 6 years avg.

Customer Question
Bought a GMC 2500HD...

Bought a GMC 2500HD with 6.0 in 2010. For next 6 years avg. fuel mileage 10.5 whether towing our 30' trailer or not. Now getting as little as 6.5 towing and 15 without trailer.Why the change all of a sudden?

Mechanic's Assistant: Has the vehicle turned into a gas hog? And how does it start -- same as usual?

A gas hog only when towing. It starts and runs great.

Mechanic's Assistant: What is the model/year of your GMC?

2010 with 35000 miles.

Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far?

No. Have taken it to 2 dealers.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

That's all.

Submitted: 8 months ago.Category: GMC
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Answered in 7 minutes by:
11/13/2017
GMC Mechanic: Gabriel Grey, Auto Service Technician replied 8 months ago
Gabriel Grey
Gabriel Grey, Auto Service Technician
Category: GMC
Satisfied Customers: 448
Experience: Master Service Technician
Verified

Good morning, I hope you are doing great! My name is ***** ***** I would be happy to assist you with this today.

Does the truck currently have a check engine light illuminated? I have seen this a few times, with a few different fixes. One was bad fuel, the customer switched to a new station and the fuel quality they were getting was not up to par. The other two times it has been a faulty EGR valve that was not allowing proper re circulation and was dragging down the engine, if it is an EGR issue it should eventually set the check engine light tho

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Customer reply replied 8 months ago
No check engine light.
GMC Mechanic: Gabriel Grey, Auto Service Technician replied 8 months ago

Okay good to know. Does the truck drive normal still or does it seem to drag?

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