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Re: 07 Buick- Jumping Speedo- Network issue?
Posted to Technical Discussion Forum on 3/5/2020

I like your thinking, however I believe his scope will take him down the wrong path. If not mistaken this beast is using low speed LAN. I haven't deducted if the U0122 and the speedo bouncing are two different symptoms or not. I would start between the ECM and... Login to read more.