What are the possible causes and solutions for a transmission that does not work in low gear (only moves in 2nd or 3rd gear)? Possible causes incl...

What are the possible causes and solutions for a transmission that does not work in low gear (only moves in 2nd or 3rd gear)?

Possible causes include: restricted accelerator pedal travel, incorrect hydraulic pressures in the regulator and valve body, electrical failure in the regulator circuit, malfunctioning valve body, and malfunctioning TPS or PCM.
Solutions include: adjusting the throttle butterfly joint, repairing or replacing the accelerator cable, performing hydraulic pressure tests and correcting pressure control adjustments, repairing or replacing malfunctioning components, and replacing the TPS or PCM if necessary.