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The U1040 code in the 2013 Dodge Dart points to a problem with the body control module (BCM) of the car. The BCM oversees functions such as windows, door locks, lights, and others related to the vehicle's body. A malfunction in the BCM can lead to these systems not working correctly and potentially causing lasting harm. Furthermore, it could result in a lack of alerts for failing car systems. Neglecting issues with the BCM could be quite costly over time. It's advised that if you encounter any problems with these functions, it's best to have a diagnostic test for the body control system, typically priced between $45 and $65.
The 2013 Dodge Dart's U0140 code indicates a problem with communication being lost with the body control module.