If the PAC module isn't working, make sure it's updated with the latest firmware. This update reflects the new CAN data Chrysler is now using.
Applicable vehicles: Jeep Grand Cherokee 2021+, Grand Wagoneer 2022+, Wagoneer 2022+, and RAM Trucks 2025+
- Download the latest firmware below.
- Update the PAC module using the AmpPRO utility tool. Follow this article for instructions. PAC AmpPro Update Tutorial
Note: The AP4-CH42 will only work in models with a factory amplifier for these certain applications.
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