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  1. J

    2005 Yukon XL2500 throwing solenoid error codes

    8.1 engine, 4L80e transmission. 233k miles. It started throwing multiple solenoid error codes and would not shift out of 1st/2nd gear. Cleaned the grounds under drivers door. Transmission shifted ok, codes went away and then started up again after a couple hundred miles. Found the connector on...

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