2004 Toyota Sienna transmission not pulling when warm

Tiny
MCPHERSONPK08
  • MEMBER
  • 2004 TOYOTA SIENNA
  • 3.3L
  • 6 CYL
  • RWD
  • AUTOMATIC
  • 180,000 MILES
We had to put a new engine in the vehicle and once the engine was put in and the mechanic drove it down the road it would drive just fine while cold, but would shift really hard into 3rd gear and then once the engine and transmission was warm it completely stopped pulling the vehicle. The mechanical has now put in 4 transmission and a new wiring harness and continues to have the same problem on all 4 transmissions. We are not completely at a loss for what could be causing this. We have talked to a couple other transmission shops and they too have not been able to diagnose the situation. The only recommendation that has been thrown out is that there might be a sensor that once the vehicle is warm is throwing a signal to the transmission telling it to stop running but no one seems to know which sensor it might be and the vehicle is not showing a check engine light or a code of any sort. Any suggestions as to what might be causing this would be extremely helpful. Thank you for your time. -Paul McPherson
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Saturday, December 12th, 2015 AT 3:48 AM

3 Replies

Tiny
JOHNNYT73
  • EXPERT
I would maybe take a look at the engine coolant temperature sensor. Make sure it reads correctly as to what the actual temperature is in the engine. Usually if its completely bad it will read something like -40 degrees.
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Saturday, December 12th, 2015 AT 6:33 AM
Tiny
MCPHERSONPK08
  • MEMBER
I am wondering how this sensor would make the transmission stop pulling the vehicle.
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Saturday, December 12th, 2015 AT 7:31 AM
Tiny
JOHNNYT73
  • EXPERT
The transmission relies on values it reads from the engine to determine shift points and such. Since it only does it when warm it could also be the clutches inside are worn and will require a rebuild. When cold the fluid is thicker and doesn't slip. When hot it is a bit thinner and slipping past.
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Saturday, December 12th, 2015 AT 8:19 AM

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