Shifting problems

2006 HYUNDAI SONATA
120,000 MILES • 3.3L • 4 CYL • 2WD • AUTOMATIC
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CAMLINE56
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Drove my granddaughters car for a few miles in just D and it was shifting fine through all gears and back. Then put it into manual when I was stopped and drove off and manual shifted into second gear which it did, but then it suddenly shifted back to first which made the engine tach up.so I put it back into D and it read D1 on the instrument panel and would not shift from there. I then stopped the car put it into reverse then back into D and it showed just D. I drove off and it shifted to second gear then went back to D1. All this time there was no check engine light shown.Hope you can help.
Dec 10, 2019 at 4:10 AM
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STRAILER
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Hello,

This is common when the input shaft speed sensor in the transmission goes out. It should have a code even though the light is not on. here is a guide to help confirm the issue with the location of the sensor in the diagrams below:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Check out the diagrams (below). Please let us know what happens.

Dec 11, 2019 at 11:07 AM