HI there
This code is pointing to the 1-2 shift solenoid. This is mounted to the valve body under the oil pan on the transmission. Sometimes dirty transmission fluid will cause this issue so check that first.
P0752 GMC - 1-2 Shift Solenoid Valve Performance - No Second or Third Gear Read more: https://www.autocodes.com/p0752_gmc.html
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