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I just purchased a 2018 QX30 about 2 weeks ago. It has 44K miles, and I received an error that said “auxiliary battery malfunction” today. I noticed my car started driving weird after, almost jerking. Is this something that’s covered under the manufacturer warranty?
The Infiniti dealership is about 30+ min from where I live, so I want to check before I drive all the way there…
If it’s not covered, does anyone know the cost?
Thanks!
 

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2018 Infiniti QX30 Premium (Mother's Car)
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Sounds like your second battery might be on its last leg.
 

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It wouldn't hurt to have your car checked if it's still under warranty. Typically I would think that batteries wouldn't be covered under warranty, but I could be wrong and you may need to get your car checked just incase.
 

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Do you know if that’s covered under warranty?
They can be covered under the comprehensive warranty -- but not the powertrain warranty. Infiniti has a test procedure and the battery must fail that procedure before they'll authorize a warranty replacement. I have seen batteries that were bad and DID need to be replaced that Infiniti still passes, however.
 

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I just purchased a 2018 QX30 about 2 weeks ago. It has 44K miles, and I received an error that said “auxiliary battery malfunction” today. I noticed my car started driving weird after, almost jerking. Is this something that’s covered under the manufacturer warranty?
The Infiniti dealership is about 30+ min from where I live, so I want to check before I drive all the way there…
If it’s not covered, does anyone know the cost?
Thanks!
Just turn the efficiency mode off when driving until you replace the auxiliary battery. The battery isn’t expensive and is located under the carpet on the front passenger side under the dashboard. It’s designed to power everything when your car shuts off for fuel savings when in efficiency mode.
 

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Do you know if that’s covered under warranty?
As p07r0457 says above, it is covered under the comprehensive warranty, but not the powertrain. If you purchased a CPO, it is not covered under the CPO warranty. I recently went through this with my 2017QX, replaced both batteries at the dealership for around $750 USD.
 

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I am seeing the same message on my 2017 Sport. I plan to bring it to the dealer this week. Between that and the steering column recall, I am starting to regret my purchase. Apparently, there are no repair parts in the entire US. It happens to be one part not shared by Mercedes.
 

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Update: Just had the auxiliary battery replaced yesterday at no charge after it failed the test. This battery powers accessories like dashboard lights. My CPO 2017 QX30 only has 15K miles on it.
 
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