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07-24-2012, 12:21 AM | #1 |
Drives: 07 Yaris Join Date: Jul 2012
Location: C. C., TX
Posts: 5
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Auto trans randomly shifts into low gear?
My 07 Yaris randomly shifts into low when driving on the highway. The shift indicator will show D but randomly also shows LOW at the same time... Can it be the oil? It looks good and no leaks. Someone said it could be the "Park Neutral Position Switch". Where is it? Any other ideas?
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07-24-2012, 08:16 AM | #2 |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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I would suspect the switch, particularly if it only shows the wrong gear and doesn't suddenly start screaming at high RPM. The switch is part of the transmission.
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07-24-2012, 08:50 AM | #3 |
Drives: 07 Yaris Join Date: Jul 2012
Location: C. C., TX
Posts: 5
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Oh yea. It does actually shift into low gear causing engine to scream. More thoughts?
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07-24-2012, 10:31 AM | #4 | |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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Quote:
AT switch.jpg
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07-24-2012, 11:28 AM | #5 |
Drives: 07 Yaris Join Date: Jul 2012
Location: C. C., TX
Posts: 5
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Thank you for the feedback and diagram! I'd does seem like it may be a sensor telling it to shift to me. Have any leads as to where to pick up the sensor if it is the prob after I check linkage? Dealer was about $580! O'Reilys a little cheaper...
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07-24-2012, 11:47 AM | #6 | |
play every day
Drives: 2012 Yaris L 2dr 5sp Join Date: Apr 2012
Location: Los Angeles
Posts: 1,961
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Quote:
(ok CT... now you can tell me how wrong I am again ) |
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07-24-2012, 11:51 AM | #7 |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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^LOL - The fact that the cluster display shows the gear changing, means that it is happening by external, rather than internal influence.
As for finding the selector switch, junkyards would be the place to look. An entire transmission can be had for $350 on eBay.
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07-24-2012, 12:00 PM | #8 |
Drives: 07 Yaris Join Date: Jul 2012
Location: C. C., TX
Posts: 5
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Ok I'll look at junkyards too. Tooted, I was thinking the same way at first too. But when driving more it randomly changes. I can barely be giving it gas basically just coasting at 55 mph and randomly shift to Low. (I wish the car had a tach for curiosity sake...) T hat motor can scream.
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07-24-2012, 10:24 PM | #9 |
Drives: 07 Yaris Join Date: Jul 2012
Location: C. C., TX
Posts: 5
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I found my problem! There was water in the connector. Looked like once water got in. There is not a was for it to drain or evaporate. Cleanned it up and so far working ok.
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Tags |
auto, park neutral position, prndl, transmission |
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