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Where is the computer reset button on a 1999 dodge 1500?

There is no computer reset button on a 1999 Dodge 1500 (or any car for that matter). The Powertrain Control Module (PCM), which is the car's computer, doesn't have a user-accessible reset button.

To clear trouble codes or reset the computer's learned parameters, you would need to disconnect the negative battery terminal for a period of time (typically 30 minutes to an hour), use an OBD-II scanner to clear codes, or in some cases, a specialized scan tool that can perform a PCM reset.