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1990 Isuzu trooper: 4x4..transmission light..down shift..shift fine

Customer Question

my 1990 Isuzu trooper 4x4 transmission light will start flashing and will not down shift you can turn the truck off and the light will go off and the truck will shift fine
Submitted: 6 years ago.
Category: Car
Expert:  Car expert replied 6 years ago.
Brea very often this is caused by faulty grounds, checked carefully the body grounds and the engine grounds make sure they are all clean and tight if they're good let me know and we will continue testing further
Customer: replied 6 years ago.
grounds are good
Customer: replied 6 years ago.
grounds are good all plugs are pluged up good
Expert:  Car expert replied 6 years ago.
Check the C168 connector at the transmission for being plugged in tight with good connection. Verify the 16 cavity blue connector C163 located in the right side of the engine compartment on a bracket has a good clean tight connection.