Ever since I have had the car it throws DTC P039 when going up slight inclines at highway speeds. TCC Engagement Problem. Gets average 17mpg with some interstate/mostly stop and go driving. Any advice?
engine rpm is higher than the default value could be slipping clutches in the torque converter,faulty brake/tcc switch, leakage in the hydraulic circuit or a bad map (manifold absolute pressure) sensor.
Bad map? I think that is what the pcm uses to determines the fault value.
Hopefully a trans tech will jump in here and help us out. Mike