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We recently were told that our Passenger side air bag sensor was faulty. We replaced the sensor and rechecked to see if there were any codes. The Air Bag light was still on but we saw the U0121 code on our OBD2 which our search says is tied to brakes. Could this code be connected to the passenger side air bag sensor? We may have installed the old one by mistake and are trying to figure out if we need to switch them again.

Vehicle: 2007 Saturn Vue 3.0L V6

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U0121 Lost communication with brake control module

This may not even be a active code, Communication code such as U0121 are what they call transparent and have no association with what you are working on, It may even clear up on its own, When you disconnected the battery the module goes to sleep, when you restore power now it wakes up you may even have to drive it so it can see its parameter.and clear itself.

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