BHardee
Newbie
First, don't laugh. I have a 2015 Ford C-Max 2.0, naturally aspirated, that is my daily driver. I have been hopping it up slowly over the last year. I installed an after market TCM 6 months ago, but I can only use the lowest 2 of the 5 settings (still better than stock), or my car has a Powertrain Fault and goes into Limp-Home-Mode. My code reader finds no Fault Code before, after, or during the Powertrain fault, except (again, no code) an "O2 Sensor Trip." I sent data to TCM manufacturer who tested it on a C-Max and said the TCM is too powerful for my factory PCM and I need to upgrade, but they don't make those. Any suggestions? Tuners? Turbos? Witchdoctors? Help!!!