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2007 Chevy Silverado 2500HD. This is my main work vehicle. Used in landscape and snow plow business. Approx 125k miles

Tested and have codes: UO100 AND UO140 and C0550.

I ran this test because I have lost a couple of things: (mainly the headlight issue started this)

1) Passengers side low beam headlight. New bulbs, fuse is good, power at fuse, relay is good (exchanged with other relays and works fine). Sometimes all of a sudden this headlight will work for awhile, then gone again

2) Speakers, all but right front channel. Sometimes they all come back but not for long.

3) Door chimes work some times but mostly not

4) Seat belt and gas low chimes on sometimes but mostly not working

I have tried to determine if all the items NOT functioning happen at the same time (ie: chimes off - speakers off0 but it does not seem the events are connected.

I am looking into installing HD headlights with a new harness that will connect direct to battery, to help with the headlight issue. Don't know what else to do there.

Any advice, help - whatever, will be greatly appreciated. Thanks, Joe.

Vehicle: 2007 Chevrolet Silverado 2500HD 4WD 8 CYL Gas

2 Answers

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Best answer

U0100 Lost communication with Power control module (ECM)

U0140 Lost communication with Body control module (BCM)

C0550 Electronic control unit ( ABS)

All these code condition are centered on one area , there is a insufficient ground ,

Go up along the firewall and check to see if this ground wire is properly making contact,

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U0100 Chevrolet Code - Lost Communication with Engine Control Module
Read more: https://www.autocodes.com/u0100_chevrolet.html

U0140 Chevrolet Code - Lost Communication with Body Control Module
Read more: https://www.autocodes.com/u0140_chevrolet.html

C0550 Chevrolet Code - Electronic Control Unit
Read more: https://www.autocodes.com/c0550_chevrolet.html

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