Question about 2004 Toyota Prius

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Battery Twice this week I have needed a jump. It starts right up when jumped & I get a screen warning of, "Transmission [p] lock mechanism is abnormal", & to park on a level surface. But I was on a level surface. This has happened many times. Toyota has checked & said the battery is strong. Any suggestions??

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  • brdg1 Oct 31, 2008

    No I don't have an audio system. I sometimes sit for a few hours & I keep the fob in the slot. Could that be causing a drain ???

  • fixitgranny Dec 20, 2008

    Car fails to start. Service dept. says nothing wrong. Msg. transmission P lock abnormal flashes occasionally. Car OK for awhile after jump starting. Dealer says battery checks out OK,,,but might a new (stronger) battery solve the problem? Also, dealer ignores the zillion blogs about this same problem saying car not driven enough is causing it to fail. Not has actually failed while driving. Thanks for any

  • pzubres Dec 31, 2008

    I have the same exact problem. Toyota diagnostics could not find a solution. I also have had a Warning light come on. The info screen shows a symbol that looks like a light with arrows on either side. What the heck is going on?

  • cherilynarms May 13, 2009

    I have the same problem as Pzubres with the warning light that looks like a light with arrows on either side. Does anyone know what this is?

  • Toyota Ed May 11, 2010

    The audio system that I am speaking of would be "factory". The flat box is known to cause drain issues with the aux battery; you did not advise if you have one...And, leaving the fob in the slot will cause a slight drain, but not like you left the headlights on....

  • Toyota Ed May 11, 2010

    Regarding needing jumped: Question: Do you have the JBL audio system? Look under the pass front seat for a flat box. Feel it to see if it is warm...if so, the solid state latching relay has failed, and the amp is staying ON,draining your Aux battery. This is a known issue. Check this & get back to me.

  • Toyota Ed May 11, 2010

    Look under the front passenger seat. Do you see a flat metal box? If so, this is the amplifier for the audio system, and it is known by Toyota to not shut off completely, and this will drain the aux battery in the rear compartment. Feel the it warm? Advise if you have this box for a solution.



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I would request that the battery be replaced regardless. Ive replaced many a Prius battery that is too weak to start the car, and by the time it gets to the shop its charged enough to pass a test. Dont try for any stronger batteries, it is a special glass matt design and shouldnt be replaced with anything non toyota. The code is probably because the voltage is too low to run certain computers, and unlock the transmission. I would probably stop leaving the key in or near the car, that certainly doesnt help.

Posted on Jan 26, 2009


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