Multiple Pacifica Display Errors Need Real Fix

I had a similar situation with my 2005 Chrysler 300, which shares many electronic components with your Pacifica. As someone with moderate experience in car maintenance, I initially tried using a basic OBD-II scanner to read the fault codes, but quickly realized this was beyond basic diagnostics. The multiple error messages across different systems suggested a control module communication issue. My workshop identified incorrect coding in the vehicle control modules after the battery had been replaced. They had to use specialized diagnostic equipment to reprogram and sync all modules properly. The total repair cost was 360€, which included diagnostic time and complete system recoding. Before suggesting specific solutions, could you share: Have you recently had any battery work or electrical repairs done? What specific fault codes are you getting? Are all vehicle functions still working normally despite the warnings? Does disconnecting the battery temporarily clear any of the messages? A proper scan tool reading from all modules would help identify if your issue matches what I experienced. Simple code readers often miss the underlying communication problems between different control modules.

Thanks for the detailed information. My Pacifica has 141677 KM and the last service was done 3 months ago, which included a battery replacement. The OBD-II scanner shows code P0700 (transmission control) along with U0100 (lost communication with ECM). No electrical work besides the battery change. The vehicle runs, but shifts feel rough and delayed. Disconnecting the battery briefly cleared the warnings, but they returned within 10 minutes of driving. A basic diagnostic scanner from the parts store wasnt enough to properly read all the control module data. Thinking my issue sounds similar to yours with the module communication problems after the battery swap. Would appreciate input on whether that 360€ repair cost included just the reprogramming or if any parts needed replacement too.

Thanks for those details. Your symptoms are remarkably similar to what I experienced with my Chrysler 300, especially the fault codes and timing after the battery replacement. The P0700 and U0100 codes appearing together strongly point to the same control module communication issue I faced. The 360€ was just for the diagnostic work and reprogramming, no physical parts were replaced. The key was having the workshop use their advanced scan tool to properly resynchronize all control modules. The rough shifting you mentioned is typical when the transmission control module loses proper communication with the engine control module. The quick return of warnings after battery disconnect confirms this is not a simple reset issue. Basic OBD-II scanners typically cant access the deeper module programming needed. My repair took about 3 hours total, mostly diagnostic and reprogramming time. One thing I learned: regular shops often lack the specialized equipment needed for full system recoding. Best to verify the shop has the right diagnostic capabilities before booking. Given the identical symptoms and shared electronics between our vehicles, you should expect similar repair costs and process.

Based on that background, I see we have very similar issues. The P0700 and U0100 codes along with the rough shifting definitely point to control module communication problems. My vehicle behaves exactly as you described, temporary clearing with battery disconnect followed by warning returns. Good to know the 360€ covered just programming work. Will focus on finding a shop with proper diagnostic equipment rather than wasting time with basic OBD-II scanners that cant handle the full system recoding. The three-hour timeframe also helps set expectations. Since my Pacifica symptoms match your Chrysler 300 case exactly, especially occurring after battery replacement and showing the same transmission-related codes, I feel more confident about the repair path now. Will make sure to verify the shop has advanced scan tool capabilities for handling multiple control module reprogramming before booking the work. Thanks for breaking down your experience. Really helps knowing what to expect both process and cost-wise for resolving these cascading error messages properly.