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Re: 07 Buick- Jumping Speedo- Network issue?
Posted to Technical Discussion Forum on 3/5/2020 7 Replies

ECM has to get speed signal from something brother. It has a VSS that is mounted in the case extension. It reports speed to the ECM. Use code P0502.

The U0122 is interesting. There are multiple bulletins for this. No crank, long crank, odd gauge readings. Co... Login to read more.

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