Question about 1990 Plymouth Acclaim

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My transmission is going into limp mode, i've been replaced the sensors and even the solenoid pack still does it. so now i'm cleaning and replacing all the electical connections. all i want to know is where is the ground strap located at or should be at? I read that that could be the problem also.

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Posted on Jan 02, 2017

  • 412 Answers

SOURCE: Transmission Limp Mode

YOU NEED TO CHECK POWER AND GROUND CIRCUITS TO TCM

Posted on Jun 22, 2009

youredone82
  • 426 Answers

SOURCE: 1993 3.3 transmission caravan wont

are you getting codes for incorrect gear ratio and shift solenoids? if so then you are in need of a complete transmission overhaul.
However before you do that, check on the drivers side of the engine compartment under the battery tray is a wiring harness that runs next to the transmission, after a leaky battery and years of service, the pink wire that goes from the tranny control module, on the passengers fender, to the tranny gets corroded and brakes inside the insulation, check powers and grounds and if all is ok then bring it to a tranny shop, the sun gear brakes alot in those units, had the same problem on my cousins 3.3L and had to do an overhaul.
sorry to be the bearer of bad news.
xander

Posted on Feb 05, 2010

  • 1857 Answers

SOURCE: replaced trans because i could

This usually points to a sensor issue or a computer failure.

What diagnostics have been done with a diagnostic data scanner. If its in limp mode what codes did you have before and what codes do you have now. ??

And what year vehicle are we talking about here??

Posted on Feb 05, 2010

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A scanner will show you. Codes will tell you. Or pull them and test them with am Ohm meter. Could be the solenoid pack also. If you transmission leaks. When it gets to low, it will suck air. This will also cause your van to go into limp mode. Start the van and check transmission fluid first. Fill as necessary. Turn it off and disconnect the battery for 30 minutes. This will clear the computer. Drive it. If it stays out of limp mode. Fix the leaks and/or keep it filled. Those sensors run around $20 a piece. The solenoid pack can be around $200+ Don't buy a good used one.

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Firstly, disconnect the battery and leave it for a few hours. Reconnect and try the car again. This resets the memory in the TCM. If the car picks up the faults again, it will go into limp mode again after a short while. If it's been a while since you changed the fluid, then put some seafoam transtune in to clean all the parts and plates. Then after a few days at least, preferably a week, go for a fluid and filter change. After this, you'll probably find it will go into limp mode again, just disconnect the battery again and reconnect after a few hours. I had the same problem in my chrysler T&C. I left seafoam in it for a week and it cleaned up all of the gum and varnish build up on the shift solenoid pack and plates.

If the problem persists, and after you find it allows you to change gears for a while and then goes into limp mode, it could be gummed up solenoid pack, or input speed sensor.

Go to o'reillys and plug in their diagnostic tool. It should provide you with the fault codes if any. If no codes, then your TCM and ECM are in good shape, and if you're lucky then it'll be something simple like a sensor, or solenoid. Try cleaning it first with seafoam transtune in the fluid for a week.

If all else fails, and their are fault codes, then take the car to a trusted transmission repair shop for a road test. The computer could be picking up slippage and making the car go into limp mode. This could be the clutch plates if no errors with the TCM, ECM are present, and you've ended up checking out the input speed sensor, and solenoid pack. The latter can cause hard shifting and slippage too, if the seed sensor is set to signal when to change gear, but the new oil, or old oil have made the friction slightly different to what it is used to or within factory limits. Firstly try reseting the TCM by disconnecting the battery for a while and see what happens.

Good luck

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