Originally posted by Darren M
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On an 09 Maxima it could easily destroy the transmission controller ($1200+) as well as the ECM and BCM. You could easily destroy $5k worth of parts by disconnecting the battery with the engine running.
I'd check the battery voltage before starting and then if it starts check it again when running. If the voltage is below specs it could be an alternator. If it's anything beyond that I'd strongly suggest taking it to a Nissan dealership. This is a very complicated car and parts are very expensive. This could be as simple as a battery/alternator issue or it could be something with the IPDM.
Also note that when you disconnect the battery there are a few things that need to be reset with a scanner depending on the car's options. The steering angle sensor, power windows, sunroof, automatic seats and HVAC system may need to be programmed to work properly.
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