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p0671, p0672, p0674, p0676, p0678 Transmission will not go into drive, unable to accelerate engine, acts as if it goes into reduced power.
How long has your 2011 GMC Sierra 2500 HD had this problem?
2 days
Visitor
Aug 12, 2020
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Codes are not transmission related - seek professional *hands-on* assistance.. Good luck!
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