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LexusRX 400h Hybrid Battery Failure



  • Soooo... Ended up being a bad 12v starter battery.  

    Sheepish story here that may help others.

    Car having trouble starting, figured bad battery.  Trickle charged overnight, then drove rx to Autozone to check battery.  Said battery was good, but only 35% charged.  Couldnt check alternator if battery wasnt above 50%.

    So I charged another 2 nights.  Still had trouble starting, flashing VSC error sometimes.  Took back to autozone, said battery was good with 60% charge, alternator was good.  I decided to try a new battery anyway.  They swapped it for me, I tried ignition, it appeared to not start like normal.  Tried twice, figured it was something else, found this post.  Returned new battery. Drove to Lexus with inverter info in hand.  Lexus' battery checker indicated a bad battery, gave car a new one and swore it was working correctly.  I had them keep my car in the lot for a few days just to make sure it wasn't draining.  All ok.  Sterling McCall is a great place, only charged me $220 ($50 more than autozone battery).

    So explaining what happened is kinda tricky... Let me try.

    I'd grown accustomed to holding the ignition key a long time to get the car to start with the bad battery, only releasing it when it was fully on.  Like 30 seconds.  This was necessary with bad battery.  But with a good battery, holding the ignition in start position PREVENTS the screen from turning on.  So if I had just started it and released the key it would have looked normal with the new autozone battery, which would have been free as it was still in warrantee.  So I'm out $200, and we are all a little smarter. :smile: 

    Sorry for long post.  Hope its helpful!

  • MY 75k 400H 2006 stop working..found to have water in the hybrid compartment, relay went bad, told it was a rear hatch seam which went bad - water tracked in through the side of the car- into the hybrid compartment- anyone have this happen
  • PF_FlyerPF_Flyer Pennsylvania Furnace, PAPosts: 6,418
    It is amazing to see the paths that water can take from a leaky trunk/hatch seal. Unfortunately, the hybrid compartment is at one of those lower levels that the water will move towards.


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  • My 2008 RX400h hybrid module, replaced in Nov 2013 as part of the Lexus recall, failed on Aug 1st this year, 2015. It appears to me to be the exact same problem that the recall was supposed to fix. All my dash lights came on and the warning messages were flashing. The car stopped dead, but luckily we already were stopped in stop-and-go traffic. Has anyone experienced this problem in 2015? Am I the only one who has suffered this problem with a recall replaced part?
    Lexus corporate was of no assistance today. They said picking up the labor cost when I had the module replaced on Aug 3rd was the best they could do because of the miles on my car (220K approx. at that time) and the fact that a car with as many miles as mine and as old as mine usually gets no consideration. Ha! What does that have to do with the part failure that evidently has not been fixed? And, how do I know this will not happen again at high speed?
  • Mr_ShiftrightMr_Shiftright CaliforniaPosts: 47,643
    So the SAME module failed again? Seems to me the replacement part should have its own warranty--do you know what that warranty was?

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