AP4-CH42 & APSUB-CH42: No Audio, PAC Module Not Working

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+

1. Download the latest firmware below.
2. 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.

AP4-CH42 Firmware

APSUB-CH42 Firmware