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Mystery solved....
It looked exactly like a pressurized leak.. Heavy rain would have masked the smell.... But, no Leak. It was all electrical , but did not look like any gauge failure I have ever seen.
The left rear tire cut through 4 wires in a bundle. The dealer repaired the wires and rerouted the bundle.
Take-away :
Dealer notified GM of problem area
Dealer looked for larger than OEM tires to disallow the warranty repair. Mine were OEM size...
Next time you have the left rear off, take a look and have your dealer do a warranty repair... I can send a copy of my repair invoice if anyone needs it.
Cheers,
Bill
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