Question about Hyundai Santa Fe
Replace speed sensor Trans-pulse generator. Price was $74.
Posted on May 26, 2012
My wife's 2002 Hyundai Accent has developed the same p0734 code. I have researched this issue for weeks. Tried doing a soft drain of the black-burnt fluid until it finally drained red then changed oil filter. Have narrowed down exactly what is happenning. First off, it shifts fine all gears, up and down until transmission fluid heats up-about 10-15 miles. Actually it ran even further the last time-30 miles until I got on the interstate and hit 55. I was manully able to run by turning OD off and soft pedalling the gas when turning OD on. The problem may begin, after the fluid is hot I think when you kick the gas in overdrive or at the high speed the 4th gear can keep up the speed ratio, it can't take it over 50 at all. The car lurches and goes into safe 3rd gear mode with these issues. When I finally took the pan off, I found most all of the peices of a skinny ring about 1-1-1/1 inch diameter. This in itself may be the kiss of death but I think once the fluid burnt and parts started breakng down, a transmission replace is enevitable. I believe and correct me if I'm wrong, overheating of the fluid caused
the transmission breakdown. When I dropped the pan the fluid a drip burned my face but....the transmission cooler in front of the radiator was absolutely cold. Is this normal or is the cooler blocked up??? Or is there a circulator in the trans that broke and that is what the peices are from. I believe the broken pieces are from a pump part or bearng cover(4th)? Hyundai I found has the cheapest price for a trans now, around &1,250 as opposed to nearly $2,000 from Advance Auto. Hynudai insists you use THEIR fluid only so don't ever tell them you didn't, even though Valvoline is just find. Read you Warranties very careful these days. It is possible I read to take a top cover off the trans if you are a mechanic or ya know what your doing and can identify broken piece, maybe replace it. Otherwise...Well good luck. Hopefull the newer transmissions are better or we learn to take better care of our car's maintenance. They need health checkups just like us.
Don't forget, if the fluid is black, have someone flush the fluid cooler good or you will contaminate the new transmission.
Hope this helps.
Posted on Mar 14, 2010
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