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05 chevy silverado will not come out of 4 low. service 4 wheel drive been on 4 a week

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2005 z71 Silverado v-8 4X4 not working.
Case History 07 09 13
Problem started with service 4wDrive message. It would come and go. Got worse as time went on. Then it got to All switch lights would only come on 3 seconds when key turned on and again when started for 3 seconds. Then no 4X4 and no lights. Researched on internet and noted problem was often solver by replacing control switch due to bad solder joints. Ordered new switch. Changed out with no change. Replaced old switch.
Went to AutoZone and checked codes. Had 4 codes B2725, B0790 (both Cleared) and Codes C0327 & C0040 (Both would not clear)
Next I decided before taking to the shop to try cleaning the contacts although I thought I was probably wasting my time. Went to radio shack and bought electronic contact cleaner spray.($9.98). Pulled 30 amp fuse under hood and raised vehicle. Disconnected plug on transfer case and sprayed contacts on both plugs(male & female). Thoroughly dried with compressed air and plugged back in. Just knew this wasn't going to fix it. Also sprayed both plugs on both sides of transfer case(Rear) (2 speed sensors I think). Anyway to make a long story short started up truck and all was normal:o) Every thing work fine and all lights and all modes work correctly. Hope you have this easy of fix to cure your 4X4 problem.

Posted on Jul 11, 2013

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You may have a bad electric shift motor on the tranfercase and the push button feature in the dash may be bad.

Posted on Jul 20, 2009


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