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Recommended Posts

hey all! 2009 CTTS. Over the last 2 days, I had to get my Cayenne jumpstarted on 2 separate occasions. Car starts up fine. Made 2 small trips, approx. 3 to 5 miles round trip. Next time i tried to start, just a click. Used jumper cables to jumpstart.

Attached is my Durametric report. I just replaced the battery 2 years ago (25,000 miles ago) with a Duralast Gold H9-DLG.

Been watching my volts via my Passport radar detector, and they start low and after driving for a few minutes, they are usually above 13.1. I've read tons of articles, and to be honest, I get confused with electricity, current, amps, etc, etc.

Got it charging on my CTEK all night, so maybe that will help.

I assume that if the volts are creeping up while driving, then the alternator should be fine? And that the battery may be bad. It has a 5 year warranty, so I may just go through the whole process of removing the thing and taking to my local autozone. Any thoughts or things i could look for to narrow down the focus? Thanks!


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Do you have the dual battery system? One under the driver's seat and if you have the auxiliary battery then it will be in the trunk under the Bose subwoofer.

If you have the auxiliary battery that it's the default starting battery while the one under driver's seat if for electrical system but can be used by the car system for starting if the one in trunk goes flat.

Sent from my SM-G935F using Tapatalk

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6 hours ago, 8202632 said:

Single battery only. Thx

Just test the battery voltage with engine off ignition off. Should be ideally 12.6 volts but acceptable is 12.3, any less is a undercharged or failing battery most likely. 

If the battery is looking ok and you only get 13volts when alternator is charging then that would suggest alternator is underperforming. 


Check the battery terminals are tight and clean also and earth cable to body connection is good and clean of corrosion. 


More investigation required I think. 

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