Auxiliary Battery Malfunction

Sounds like your second battery might be on its last leg.

Do you know if that’s covered under warranty?

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.

steffantillon said:

Do you know if that’s covered under warranty?

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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.

steffantillon said:

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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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.

steffantillon said:

Do you know if that’s covered under warranty?

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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.

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.

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.

I’m surprised they replaced it under warranty. Comprehensive warranty only lasted 4 years.

Rodplatt said:

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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I just purchased a 2017 QX30 and have the ECO mode set, as well as, the Idle Stop Start on, but nothing happens when I press the brake. Was thinking it’s the AUX battery from what I’ve been reading. Something that’s pretty easy to replace or take to dealer? This is my first Infinity and I’m still figuring out the quirks. For example, doors auto lock when in drive, but I have to manually unlock when in Park. Makes no sense to me why it works that way. Another frustration is the lack of BSM standard on a “luxury” vehicle. I had it standard on my 2015 Sienna, but nothing on this. Overall, I’m happy with it and it rides nice, just a few things that are bothersome.

Aux battery is easy to replace, but be careful shooting the parts canon without verifying the issue, otherwise you just throw money away.

BSM was an available feature. Luxury brands typically have more features as optional compared to mainstream brands. They allow more choice and yes they make more money that way.

steffantillon said:

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!

Click to expand...

Mine went out around 29,000 miles and mine was covered under warranty.. I had no idea the car had two batteries (one of electrical system, the other for the engine

Well I tore apart my passenger this evening to take a look at everything. Funny thing happened that scared me. I had just filled up my car them headed home. I stopped at a stop sign and then a red message came up in regards to my tranny...do not shift take to dealer bla bla........ Looked down and car was in park. I turned on my flashers and turned car off for a few seconds then I turned it back on and put it into drive and drove home the rest of the way without issue. No message in regards to the /aux battery but its form 2016 based on the date stamp and figured 7 years is long enough so I better swap it out. Can't believe the crappy designto get to it. Remove the side skirt. Remove the cabin filter door (Might as well check and clean that ) pull your carpet all the way back.
Need to get a battery soon. Not bropping $200 on a MB one I'll buy a compatible model off Amazon my only concern is none of those have a vent hole. they are all sealed.

anyone have a Amazon battery link that will fit a 2017 QX30 Sport?

My 2018 QX30 only has 20,000 miles. And the battery died too. I have an extended warranty for 6 years and went to the dealer. The battery turned out to be out of warranty. They brought the battery from the Mercedes dealer and replaced it. Now everything is ok.

Waiting on new main Battery from Rockauto as well. Was supposed to get it Wed but FedEx screwed up and 2 day delivery in now a week. RockAuto has the worst customer service I've ever encountered.