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Old 11-22-2017, 01:31 PM   #9
pierrot
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Join Date: Jun 2012
Location: Glendora, CA
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2000 L-Series 2.2L Sedan
Default Re: Getting code u2105

According to my 2000 L-Series FSM, Body/Electrical, vol. II, DTC U2105 is defined as "LOST COMMUNICATIONS WITH ECM." One possible repair is to replace the ECM, but that is only stated after certain tests are performed. Other than that, terminal connections at various locations are recommened to check tighteness. This relates to things fdryer has pointed out. I also agree with floridasl22002 regarding the understanding of what this DTC actually relates to so as to make an accurate diagnosis. He correctly points out that use of the GM Tech II Scan Tool, or its equivalent, is required in this instance.

I hope that the OP will keep this thread updated.

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