limp mode

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.

My 2012 buick regal is stuck in limo mode I think. I've done just about everything I can think of it get it out. It's running so many codes, its not funny. The shop told me a cracked manifold so I replaced both intake and exhaust manifold. Also replaced the maf sensor. Air filters' cabin and...

Observations/opinions/suggestions would be appreciated. 1995 Park Avenue V6 3800 245K miles. Engine runs great, starts first time every time. Throwing 3 codes: P0755, P1257 and P1670. Made 10 hours round trip, GA to FL and back. Parked car overnight. Went to store and drove back home, 2...

I have a 2003 regal that i cannot get out of limp mode. The engine runs great. Its not throwing any codes (DTC or transmission). It drives great and accelerates fine till I get up to about 50 miles an hour. Its not shifting into 3rd gear. If i push the accelerator when Im doing 50 the...