Question about Cars & Trucks
Trans shifts fine 1-2, but stays in 2nd gear up to 45mph,when you let up on throttle trans shifts into 4th gear. If you let vehicle slow to 35mph and apply light pressure to the throttle trans shifts in to 3rd gear, then shifts up in to 4th gear,& Torque locks up. I get no codes, changed filter & refilled w/Dextron III fluid. Problem still persist. Problem is same hot or cold. Could this be caused by the Pressure control solenoid, or a sticky accumulator piston?
Posted by Anonymous on
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Posted on Jan 02, 2017
DTC P0734 is "4th gear incorrect ratio" - that's your torque converter 'LOCK UP Clutch" It's worn out (or you're using the wrong Trans Fluid required by Hyundai - SPIII OR Both). The P1624 is simply the Trans Control Unit (computer) communicating to the Engine Control Module (ECM computer) MIL - on request signal to ECM = asking it to turn on "Check Engine" light. MIL = Malfunction Indicator Lamp. When the torque converter 'lock up" clutch slips or doesn't engage, the trans automatically returns to 3rd gear and stays there (it's called 'fail safe' mode) until you cycle the ignition key, then everything resets until the malfunction occurs again.
You'll need to have an AT (Automatic Transaxel) tester hooked up to verify this. Hyundai has a Service Bulletin specifically for "gear incorrect ratio' codes. If when you changed the trans fluid, was it done at a Hyundai Service Center? If not, someone may have installed the wrong fluid.
Posted on Jun 02, 2009
not sure if this is the answer yet but i have the same problem with the same codes i work at an auto parts store and a few of the techs that are customers have lead me in the direction of changing the ignition switch, i am doing it today will let you know if it solves the problem
Posted on Jan 27, 2010
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