GrandVoyager Battery Drain Causes Electrical Chaos

As someone with some hands-on experience with Chrysler vans, I dealt with similar electrical gremlins in my 2005 Chrysler Voyager diesel. The symptoms you describe match what I experienced, weak lights, error messages, and slow cranking pointing to battery issues. After noticing consistent battery drain problems, I had it checked at a workshop. The diagnosis revealed a faulty battery sensor, which was incorrectly reporting battery status to the vehicle computer. This caused various electrical systems to malfunction and led to premature battery failure. The total repair came to 315€, including diagnostics and replacing the defective battery sensor. After the fix, all electrical issues cleared up and the battery charging system worked normally again. Before jumping to conclusions, could you share: How old is your current battery? Have you checked the battery terminals for corrosion? Does the alternator warning light come on while driving? Are there any aftermarket electrical accessories installed? Getting this info would help determine if you are facing the same battery sensor issue or if there might be a different underlying cause for the battery drain. Consider having a professional check the entire charging system. Visual inspection of battery terminals and alternator belt tension is a good start, but proper electronic diagnostics will pinpoint the exact cause.

Last service was at 47412 KM and my mechanic found the issue. After cleaning the battery terminals and running diagnostics, they discovered a significant parasitic draw. A faulty body control module was causing constant battery drain, even with the car off. The module was replaced for 280€ plus labor and the vehicle battery now maintains proper charge. Having it professionally diagnosed saved me from repeatedly replacing batteries when the real culprit was the electrical system itself. The alternator and battery tested fine once the excessive drain was eliminated. Would recommend others check for parasitic draws before assuming a discharged battery needs replacement.

I had almost the exact same situation with my 2003 GrandVoyager. After dealing with the battery sensor issue mentioned earlier, I also discovered a parasitic draw caused by a faulty body control module. Low battery symptoms kept returning despite having a healthy alternator and relatively new battery. The diagnosis matches perfectly, parasitic draws are often overlooked when dealing with vehicle battery problems. A car battery can be perfectly good but will keep discharging if there is constant power drain from malfunctioning modules. The repair cost on my van was similar, around 290€ for the module plus labor. After fixing both the sensor and module issues, the battery charging system has worked flawlessly. No more error messages, flickering lights, or battery failure concerns. This reinforces why proper diagnostics are crucial. Simply replacing a discharged battery without finding the root cause often leads to repeated failures. Testing for parasitic draws should be standard procedure when investigating electrical system problems. Our identical experiences with the GrandVoyager suggest this might be a common failure point in these models. The body control module issue seems to surface around this age and mileage range.

Thanks for confirming the parasitic draw diagnosis. After getting the body control module replaced, all those frustrating electrical issues are finally resolved. The car battery now holds its charge properly and all systems work as they should. The complete diagnosis and repair came to 280€ plus labor, but it was worth every cent to fix the real problem rather than keep replacing batteries. The service center found the faulty module was pulling constant power, leading to battery failure even when the vehicle was off. For anyone else facing similar electrical system problems in their GrandVoyager, get the parasitic draw tested before assuming you just need a new battery. A discharged battery is often just a symptom of underlying electrical issues that need proper diagnosis. Really glad I had this properly checked instead of throwing parts at the problem. The alternator and original battery are working perfectly now that the excessive drain from the bad module is fixed. All those error messages and starting problems disappeared once the actual cause was addressed.