Or. Did they CHARGE you for a transmission repair that was not performed?
THE primary cause of a condition like yours is a cracked forward clutch piston. If the transmission was repaired, this may have been overlooked, hence the probllem remains.
A "bad PCM" is an unlikely cause for several reasons.
The manual valve inside the transmission controls the initial routing of the hydraulic oil. In any driving range, oil is routed to the "default" circuit until the PCM takes over and controls different circuits to activate or deactivate friction elements that control gear ratios.
Example: When you select D or OD, the manual valve sends hydraulic pressure to the forward driving circuit. Vrom there, the PCM can only control the actual gear commanded by road speed, engine RPM, and loading. The choices are 1st, 2nd, 3rd, or 4th gears. Neutral is not an option.
Your problem is more of a mechanical/hydraulic nature.
Friday, July 31st, 2009 AT 7:12 AM