the monte has one code p1811 which does not trip my cel on the dash. it some times has slips out of gear for 2-5 seconds and catches hard, it does not slip back into gear. it seams to be 1st-2nd and 2nd- 3rd. what might be the cause, and how can i repair it before it damages the transmitain.
Start by checking/replacing the transmission fluid if it has not been serviced in the last 30k miles, if you still have the problem a you should take it to a transmission specialist
if there is hard shifting and there is metal in the transmission, the transmission might be bad.
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