Transmission won't shift out of 2 and my speedometer is working

Asked by Miraclemaker Jun 25, 2018 at 04:40 PM about the 2000 GMC Sierra 1500 SL Standard Cab LB

Question type: Maintenance & Repair

It will shift out of 2 only if I rev the engine but will not go into 3rd any
suggestions on what it could be

1 Answer

Just got these codes co265 co227 co281 co226 co225 off the scanner erased all drove 2 miles and no more codes came back n the truck still won't shift right anyone know what's going wrong

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