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Old 06-07-2019, 02:00 AM   #3 (permalink)
Diesel Prodigy
Join Date: May 2015
Posts: 4,235

You need a more advanced code reader, that can read codes from the TCM. P0700 is just a code indicating that the TCM has more codes to read...
2004 GMC Sierra 3500 C&C, added 4WD, 6.0L gas, Extended Cab, SLE, Transgo 4L80e-HD2 kit installed
Whee! Dually Club Member #1109
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