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I have a 2002 GMC Sierra 3500 duallywith a, With a 6.6
With a 6.6 diesel and Allison tranny. When I get on it and it reaches a shift point the rpm's will level off she throws a lot of black smoke and won't shift up. If I let off the throttle a bit, it will shift and accelerate until the next shift point then act the same way. I have two codes, first one is low fuel pressure under power surge. The second is a class two communication error. What do you think. … read more
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I have a 2003 GMC ENVOY I've changed the battery the starter
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kalamykid
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Thanks in advance there. Bought 2003 savana conv. Van. The
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Pete
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GMC Sierra 1500 SLT: 2007 sierra5.3 L with 4 spd auto4x4wont
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GMC Safari AWD: I own a 2003, GMC Safari with 54,000 miles.
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Gm Tech (Cam)
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GMC Envoy XUV SLE: Hi Cam. I am going to replace the rear
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Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

1,832 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

1,589 satisfied customers

GCM master tech over 25 years

Dave Nova

Dave Nova

GMC Technician

929 satisfied customers

ASE Master Certification. GM World Class Certification

Chris (aka-Moose)

Chris (aka-Moose)

GMC Technician

675 satisfied customers

16 years of experience

Ron Z.

Ron Z.

- GMC Tech -

285 satisfied customers

18+yrs experience. State Inspector & GMC Diagnostics/Repair

JFN1

JFN1

ASE Certified Technician

272 satisfied customers

GM Master Technician

George H.

George H.

ASE MasterTechnician

230 satisfied customers

15+ Years ASE Master Technician with Level 1 Certification

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