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Pickups Chevrolet Silverado & GMC Sierra Chevy Silverado and GMC Sierra 4x4 Questions
233 messages, Last post on Nov 08, 2009 at 11:21 PM
You are in the Chevrolet Silverado & GMC Sierra Forum. Your Host is kcram
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Replying to: bruce48532 (Jan 04, 2008 9:03 am) Here's my recent post on my fix: I just got my truck out of the shop at Chevy and after 2 days of looking at it including the switch and transfer case motor, they found that the main ground for my truck had a bad connection and was loose. They cleaned the corrosion around the ground and tightened it and all my problems were solved. I was almost to the point of getting a new transfer case motor and switch after the recommendation from Chevy, but since I had other intermittent phantom lights also going off, they called in the electrical technician to take a look. They found 44 DTC's that stated "unable to contact..." and that's how they traced the ground. Once they fixed the ground issues, my 4wheel drive and auto trac engage within 2 seconds and doesn't switch from 2wd to 4wd and vise versa. I was also over my miles and now out of warranty by 1200 miles (37,200) and was expecting to pay the 97.00/hr rate, but my service advisor talked to his manager and they covered it under warranty to troubleshoot and fix the root cause. GO LEE JOHNSON CHEVROLET, KIRKLAND WASHINGTON!!
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Replying to: vinceblas (Jan 04, 2008 9:11 am) kcram - Pickups Host
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I have a Chevy 2500 4x4 with push button 4x4 and Auto 4x4. The Truck shifts into 4x4 HI, Lo and Auto 4x4 fine. However 5-10 seconds later the 4x4 service light comes on. Also I cannot shift it out of 4x4 mode - pressing the 2w button has no effect regardless of if I am in Drive, Park or Neutral. However, If I turn off the truck and then turn it back on I can press the 2w button and it will go back into 2w mode just fine. This problem happens every time I try to go into any of the three 4w modes. The repeatability of it sounds like I'm doing something wrong. I should add that the truck has a 6" lift kit and 365/65R16 tires. It also has 74K miles. I also have another problem with hard "clunk" shifting when the transmission is upshifting. It downshifts smooth. This only happens after the truck has run for 15 - 20 minutes. After turning off the truck for 10 minutes or so, like when getting gas, it will shift smooth as silk. Any ideas. Thanks for any help. |
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Replying to: kcram (Jan 04, 2008 6:40 pm) |
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Replying to: strodsfam (Jan 05, 2008 2:10 pm) The reason for the failure of the encoder motor on my 4wd was due to a bearing freezing on the sector shaft, this shaft connects to the encoder motor. The transfer case was cracked allowing water/salt to corrode the sector shaft bearing resulting in the encoder motor failure. The transfer case crack... I don't think it was a crack from impact. I think it was a bad casting from the factory because of the location of the crack. JB weld in the crack fixed the problem along with a new sector shaft bearing and encoder motor. link for encoder motor for your truck http://stores.channeladvisor.com/Auto-Parts-Direct-To-You/Items/1420002-gmc%20c%- 20series? dealer cost to fix this apx. $1200.00
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Replying to: bruce48532 (Jan 07, 2008 6:12 am) |
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i have a 2003 sierra my prob is my 4hi and 4lo dont engage but my auto 4 does work. when puttin into 4 lo it does gear down but front wheels do not engage could this be the encoder motor on the transfer case. any suggestions would be greatly apreciated. I can hear it is tryin to engage when i push either the 4 hi or 4lo buttons but like i said the front wheels dont engage
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Replying to: bruce48532 (Jan 07, 2008 6:12 am)
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My 4 wheel drive went out this past week without any warning. I backed up to turn around and when I put it back into drive it made a grinding noise and the front wheels quit pulling. I tried several times and it would never engage again just the grinding, like gears not fully meshed. When I push the button it feels and acts like it engages 4hi and/or 4lo. I've read most of the posts on here and most just say theirs just quit working and it's the actuator motor. Is it possible that it is only partially engaging? Could it be the autolocking hubs? I haven't had time to check if the axles or drive line are turning, dark to work dark when I get home. I just need some advice for when I start on it this weekend. My truck has 172,000 on it and I've never had any other problems except fuel pump (twice). Any help in the right direction would be a greatly appreciated. Thanks osweeks
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Replying to: strodsfam (Jan 08, 2008 4:07 pm) |
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