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Pickups Chevrolet Silverado & GMC Sierra GMC Sierra: Problems & Solutions 
1492 messages, Last post on Oct 12, 2006 at 5:32 AM
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I have a 2004 GMC Sierra 4x4 with only 7,000 miles on it. Just after 6,000 miles, it began to show a really bad vibration/shudder when the brakes are applied. I brought it to the dealer who of course could find nothing wrong (typical excuse). Now when I lightly apply the brakes, the truck begins to shudder and it seems like 30 mph and under is the worst. It begins to shake and it gets so bad that that I can actually hear a knocking sound! It is an awful sound. I am not 100% sure that it could be warped rotors......and I would almost think it could be ABS, but no lights come on. The truck did sit in a garage for some time, like 5-6 months and there was some rust build up on the rotors that has since worn away and they are shiny. Can anyone offer some help on this, it must be fixed! Thanks! 
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Replying to: dale3n8 (Feb 16, 2006 6:25 pm) Rotors can get warped by uneven lug nut tightening with an air impact gun (unless they use a torque extension with it). Did you have your tires rotated and did they use an air gun on your lug nuts to tighten them? However, warped rotors usually cause pulsation it the brake pedal and chatter when braking hard at high speeds. Brake chatter at low speeds under light braking conditions can also be caused by sticking cliper sliding pins.
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I have a 2005 GMC Sierra 1500 4wd, just recentley installed K & N cold intake kit and then programmed with Hypertech programmer, while programming a dtc(diagnostic trouble code) came up (B0229) Is there a web site where i can go to to check what this code is? Truck runs great, and there is no check engine light on. Thanks barry
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Replying to: barry12 (Feb 16, 2006 8:36 pm) I know of no site where they're listed. Maybe someone else does. DTC B0229 relates to HVAC Recirculation Door Position. Whether it's induced by your programmer or is just one of those maddening coincidences is anyone's guess; since both PCM and HVAC Control Module involve 'memory' it may not be coincidence. If your recirculation controls are working properly I'd clear the DTC and not worry about it unless it recurs. If your controls are not working properly you may need recalibration or some other action which means a trip to the dealer, (after restoring factory program). -David
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Replying to: noobie1 (Feb 18, 2006 8:17 am) |
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Replying to: p100 (Feb 16, 2006 6:51 pm) Dave
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Replying to: dale3n8 (Feb 20, 2006 7:21 am) What you are describing sounds to me like a problem with the ABS system. Either way it is a warranty issue and should be addressed by the dealer.
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Replying to: noobie1 (Feb 05, 2006 8:20 am) |
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Hi, new member here! I have a 93 GMC sierra 1500. I just put a new crate engine in the beast and thought with new sensors that the SES light would go out! (That wasn't the only problem with the old engine-long story). I still get a code 43! That's the anti-knock sensor. It's a brand new one! Will it hurt the truck to run it with that going on? Will there be any long-term damage? The mechanic I who put the motor in seems to be avoiding me about this problem. any help would be appreciated. 
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