For years, car owners have utilized the OBD2 port for various purposes, from diagnosing engine issues to monitoring vehicle performance with data loggers and code readers. Many, like myself, have left devices plugged into this port for extended periods, sometimes without encountering any problems. However, the question of whether leaving a device plugged into your 2013 Charger’s OBD2 port can drain the battery is a valid concern, especially if the car isn’t driven regularly.
The OBD2 port, or On-Board Diagnostics port, is designed to provide access to your car’s computer system for diagnostics and data retrieval. It does supply power to connected devices, which is what allows code readers and data loggers to function. While the power draw of most OBD2 devices is minimal, it’s not zero. This raises the possibility of parasitic battery drain, particularly in vehicles like a 2013 Charger that might have slightly older electrical systems compared to the newest models.
In my own experience, using various vehicles over the years, including performance cars and daily drivers, I’ve routinely plugged in OBD2 code readers and data loggers. Often, these devices remained connected for days or even weeks without causing noticeable battery issues. This was usually the case when the vehicle was in regular use, driven every day or every other day. The alternator would replenish any slight drain from the OBD2 device during normal driving.
However, there was one notable exception. On one occasion, I left a basic OBD2 code reader plugged into my Porsche Boxster while going on a vacation using a different car. Upon returning after an extended period of inactivity, I discovered a significantly weakened battery, requiring a replacement. Although the battery was nearing the end of its lifespan anyway (over six years old), the constant drain from the OBD2 reader likely expedited its demise.
More recently, for about the last decade, I’ve consistently used data loggers in my vehicles, including a 2018 Challenger Hellcat and a 2018 Mini JCW. I’ve also used them in previous cars like an R/T Scat Pack, Porsche Boxster, and Porsche Turbo, going back to around 2006. These data loggers, designed to be low-power devices, have generally not caused any battery-related problems, even when left plugged in for shorter periods of vehicle inactivity. It’s worth noting that I have experience programming these devices and ensured they enter a very low power state when the car is off, adhering to well-documented communication protocols.
Considering a 2013 Charger specifically, the risk of battery drain from a plugged-in OBD2 device is likely similar to other vehicles of that era. The key factors are the device’s power consumption and the duration of vehicle inactivity. For short periods of parking, like a few days, a typical code reader or data logger should not cause significant issues. However, for longer periods, especially weeks or months, it’s prudent to unplug any OBD2 devices to eliminate any potential parasitic drain and preserve battery health.
If you’re concerned about battery drain on your 2013 Charger, especially if you plan to leave it parked for an extended time, it’s always best practice to unplug any accessories connected to the OBD2 port. This simple precaution can prevent unexpected battery depletion and ensure your car is ready to start when you need it. Regularly monitoring your car battery’s voltage can also provide insights into its health and help identify any potential drain issues before they become a problem.
