Question about 2001 Chevrolet Impala

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Transmission shifting rough after fluid change.

I have a 2001 Impala 3.8 with 90K; bought 18 months ago. The trans always shifted smooth; dont know if or when the fluid was changed last. Was told the fluid smelled burnt so I had it changed. Now it shifts hard and abruptly after about 20 minutes driving. What should I expect a trans shop to tell me? Not looking for a repair bill as it still shifts smooth when cold. Is dirt now getting stirred up; can/should it be flushed? Opinions please, before they have me do something I dont need to.

Posted by on

  • soxguy52 Nov 13, 2009

    Are any of these potential problems typical after changing the fluid, because it started right afterwards. And yes, there is an AutoZone here, so I can check if there are any codes. Thanks.

  • soxguy52 Nov 21, 2009

    I took it back to the shop while it was shifting rough. The computer is giving off a code for the pressure control solenoid. They say this is a common problem on this model. Would this solenoid act up only when hot, not cold? As it still shifts smooth when cold. Comments? Sounds like this solenoid is a 5 hour + job and expensive.

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  • Chevrolet Master
  • 19,396 Answers

Hi.

Check the transmission filter.

If replacing or refilling transmission fluid does not help, there are many possible reasons why this happens.

The most common is a faulty shift solenoid. The solenoid pack is located on the valve body in the transmission.

A faulty TPS or a faulty speed sender can cause trouble shifting.

A slipped component inside the transmission can cause similar problem.

The transmission is also controlled by a module caused TCM, that will be the last part to test.

The first step in troubleshooting is getting the fault codes from car computer.

You can get a free Fault Code reading at AutoZone. The test is free of charge.

If there is no AZ in your area, then you can either go to a local mechanic and have the code reading done for a small fee, or purchase a code reader and hook it to the PCM module to read codes.

If you have Autozone near, go there, and have the code scan done.

Take note of the codes on a piece of paper and come back here with the codes, so that we can be more specific on what the problem can be and how to fix it.

Regards.

Posted on Nov 12, 2009

  • Ginko
    Ginko Nov 13, 2009

    Replacing the fluid may move the metal debris inside the transmission box and cause problems if the transmission is quite worn.

    If you have not replaced the transmission filter, you may need to have fluid replaced again. Replace the filter along with fluid.









    2001 Chevrolet Impala Filter Kit


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