Faulty engine system

Refer to Diagnostic System Check - Engine Controls in Engine Controls 0.8L

Incorrect ATF level adjustment

Refer to Transmission Fluid Check

Incorrect select linkage adjustment

Refer to Park/Neutral Position Switch Replacement in PNP Switch Replacement

Low line pressure

Disassemble transmission and inspect:

Broken or damage oil pump

Seized or broken pump gears

Error in control valve spool sliding

Damaged, leaking or misaligned