'02 Elantra auto trannie sticks in 1st gear

This problem just started in my 02 Elantra auto trannie and has happened only twice over the past two days.
Started motor (hot weather AZ desert) and backed out of driveway.
pulled lever into "D". started up road and trans would not shift out of 1st gear. (was NOT in 2nd "failsafe") Did not taker it over 3000 RPM. Braked and tried it a second time - same thing. Pulled lever back through 3,2 and 1, then back to 2 at which point trans up shifted to 2nd gear and was fine all day.
This morning started motor and went through same startup and backed out same as yesterday - all went well. Cruised up the road a mile to get my mail. Placed in 'N' on side of road while opening some mail. Started back home in "D" and would not upshift to second. Braked and tried again in "D" - same thing. Tried a third time and trans shifted OK.
36,000 miles on OD - 2002 Elantra GLS Complete trannie flush at Hyundai dealer at 30,000 miles and refill with SP III. Old fluid was in good shape. Mostly highway miles at 75mph.
I do have extended warranty and bought the car with 15K on the OD
The only recent noticeable problem of any kind is an occasional slight misfire or roughness at first startup in morning. No codes have been set and I assume I have a spark plug or wire that is borderline.
Any suggestions would be appreciated.
Thank you
Paul
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If you haven't checked for engine/trans codes since the trans issue started, you may wish to do that now.
Don't worry about exceeding 3k rpm (as long as you don't do it for a very long period of time). Many times, the car doesn't recognize there's trouble until after that point. You may be able to accelerate along and as you near the red line, the car may eventually drop into third (failsafe) and illuminate the check engine lamp with a trouble code. I'd suspect an input or output speed sensor.
And best of all, you're still within the warranty period -- 5 years/60k miles.
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hyundaitech wrote:

Thanks for the good information, hyundaitech. Am I to understand that a code can be set without a dash indicator light going on??
I will try to force a code next time. BTW: thanks for the correction on "failsafe - 3rd gear".
Paul
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That's correct. You may have already stored a code in the Trans computer. The trans computer doesn't necessarily request a check engine lamp each time it sees a problem.
Even your engine computer is that way. Because of the OBD-II protocol, it doesn't set a check engine lamp for most conditions until those conditions occur on two consecutive drive cycles. As long as the test doesn't run and pass, however, the code remains in memory as a pending code.
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Hyundaitech, why wouldn't this be covered under the 10yr/100,00mile warranty? bill
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Hyundai (and nearly every manufacturer) does not view sensors as a powertrain component. Thus they are not covered by the 10/100 warranty.
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