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GMC TSB #PI1343B
2012 GMC Sierra
TSB Document:
Affected Component: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)
- Summary
- This preliminary informational bulletin provides a procedure to reset the transmission adapts and test drive in additon to a transmission control module reprogram to correct a harsh or tie up feeling from 6-4 downshift
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