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Heavy bump from P to R

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Old 12-23-16, 03:42 PM
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Billiamch
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Default Heavy bump from P to R

I have a 2000 ES300 and when leaving work today, I put my car into reverse from park and it violently shifted into reverse. I put it back and park and tried it again. It continued to happen when initially shifting into reverse. It has no loss of power while driving in reverse, but seems to be in limp mode while in D. I have had a code for the shift solenoid for a few weeks now. When in drive, car won't go over 2k rpms. My car has the u140e trans, I'm curious if anyone has a diagram of the trans and motor mounts, or if anyone else has had the same issue, if so, how did you fix it?

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Old 12-23-16, 03:50 PM
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LeX2K
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What is the service history of the transmission? What colour is the fluid?
Old 12-23-16, 03:52 PM
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Billiamch
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Originally Posted by Lexus2000
What is the service history of the transmission? What colour is the fluid?
it's fresh, I changed it about two months ago, and again about 4 days ago. I used the appropriate trans fluid
Old 12-23-16, 04:27 PM
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LeX2K
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Did you also drop the pan and change the filter? If the fluid is fresh and the filter is new/clean then it sounds like one of your shift solenoids has gone out or perhaps a more serious mechanical problem. What's the exact code?
Old 12-23-16, 04:29 PM
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Billiamch
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Originally Posted by Lexus2000
Did you also drop the pan and change the filter? If the fluid is fresh and the filter is new/clean then it sounds like one of your shift solenoids has gone out or perhaps a more serious mechanical problem. What's the exact code?
  • I did change the filter and clean the pan. I can't remember the exact code. But it says "shift solenoid circuit A and B"
Old 12-23-16, 04:39 PM
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LeX2K
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I'm sure you've read up on this you'll get that code due to incorrect fluid level, dirty fluid or clogged passages, failed solenoid (uncommon) or damaged wiring. Or rarely a bad ECU.
Old 12-24-16, 04:21 PM
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I had a similar problem and for me at least, fixing the slack in the throttle cable fixed the thud I had. At least I'm pretty sure it did, it's been a few years
Old 12-24-16, 08:24 PM
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speedkar9
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Could be a broken mount, here's mine:
Old 12-25-16, 02:32 AM
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Originally Posted by speedkar9
Could be a broken mount, here's mine:
https://www.youtube.com/watch?v=5EYQSpkOpWw
Those mounts look ok to me. What did movement look like after you replaced mounts? Which mounts did you replace?
Old 12-26-16, 02:11 PM
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Don't think it's an engine/trans mount. Put my car in reverse today to back it out of the garage and the bump was nonexistent. Pretty sure it's a shift solenoid or TPS. I read that a failing TPS can cause harsh shifting, lack of power in accelerating and a sort of limp mode, all of which I've been experiencing
Old 12-26-16, 11:30 PM
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so can a failed forward no1 clutch. or a failing torque converter.
Old 12-27-16, 06:42 AM
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Originally Posted by speedkar9
Could be a broken mount, here's mine:
I had the same issue. Replacing the rear engine mount fixed it.
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