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Where is the BTSI solenoid for a Chevy astro van 1999 lacated needs replacing?

The BTSI (Brake Transmission Shift Interlock) solenoid on a 1999 Chevy Astro van isn't a single, easily identifiable component like a standalone solenoid you might find on some other vehicles. Instead, the function of the BTSI is integrated into the transmission control module (TCM) itself. There isn't a separate solenoid to replace.

If you're having issues with the brake/transmission interlock system (where the car won't shift out of park unless the brake is pressed), the problem is most likely within the TCM, the brake pedal switch, or the wiring between them. You'll need to have a mechanic diagnose the problem to determine the faulty component. Replacing the entire TCM is generally the solution when the BTSI function fails.