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Caroquintero_156

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  1. Caroquintero_156
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    Having the same issue. Bought the truck new in February 2020. At 1600 miles CEL came on and Onstar diagnostics gave me error code P1488. Took it to dealer and they did a manual regen and code cleared. At 2000 miles CEL light again and same code. They did another manual regen and said it was a participant matter sensor safety tube. At 2700 miles CEL light again and same code. Dealer did manual regen and flashed the computer. At 3600 miles and CEL light and same code AGAIN! Took it back to dealer and now they are saying it is the participant matter sensor that is bad, but...they don’t have any in stock and they can’t find anyone at GM that does, and the part is back ordered and they don’t know when it will be available. ?????
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