tcm

I have a 2010 Buick Lacrosse CXL AWD 3.0L with 97,495 miles. It had a code P0877 - Transmission Fluid Pressure (TFP) Switch 4 Circuit Low Voltage. This is a known issue with the GM 6T70 transmissions. I repaired the faulty TFP switches using the Sonnax repair kit and used the factory service...

Wondering if anyone has the wiring diagram for the grounds. I'm a NOOB so I'm learning on the fly. Any help would be greatly appreciated. Think I may have a bad ground somewhere but not sure where they are all located. Battery is good.

Recently I was dealing with a weak/dead main car battery, and since then I installed a new battery. I am getting these GM DTC 3 codes when connected to diagnostic scanners (no MIL -Malfunction Indication Light), also there are no errors on the instrument cluster. The car drives fine. P175F...