Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
my info shows P1815 : Transmission Fluid Pressure (TFP) Valve Position Switch- Start In Wrong Range
so I'd begin by replacing the transmission fluid with fresh
Also check its level with the gearbox warm and just after you've moved the selector through all the positions leaving it for a few seconds in each one and then back to park.
You can top up the box through the side fill plug if required and make sure you use the correct oil for your car as the fluids are not all the same. Some manufacturers recommended a change of the type of fluid - Speak to the local dealer and parts dept - they will advise you on the updated fluid to use..
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