Question about 2005 Cadillac CTS

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My 2005 Cad. sedan deville sts has a hard down shift when slowing from 3-2 and 2-1....Dealer says soft ware problem but no codes come up on any of the computer readouts. Any idea how to cure

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  • rvsrme1 May 24, 2011

    Local dealer guaranty Chevy in Junction City says they did and checked all functions as you have recommended before I got your message. They did the tech-II and rebooted the latest and greatest software. and tested PSM but PSM shows good. No other codes appear that indicates any problems. Any other solution? Can the PSM be bad and still show good? thanks

  • rvsrme1 May 24, 2011

    sorry ment PCM not PSM.......my bad

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  • Cadillac Master
  • 3,018 Answers

  • It is possible for the PCM to be 25% bad and not throw a code but this is a rare occasion.
  • Have you flushed the transmission fluid in the last 50,miles? If not do this.
  • Dextron VI is recommended now but I would buy a transmission friction additive. It's about 8 ozs. and really works good.
  • When did you last change the transmission filter? If 50,000 miles since last then change it.
  • I have seen filters be so clogged a car would not even go into gear until it was changed.
  • It really sounds like your having some transmission issues.

Regards, Tony

Posted on May 25, 2011

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  • Cadillac Master
  • 11,800 Answers

The PCM, which should detect the wear of the clutches on the transmission and compensate accordingly by modifying the oil pressure in the transmission and the ignition on the engine, is no longer doing its job accordingly.
Either the software stored on it got corrupted and it will have to be reloaded using a GM Tech-II tool that every decent dealer repair shop should have (a very simple and fast job) or the PCM itself is defective and it will have to be replaced and reprogrammed.

Posted on May 24, 2011

  • Azrael SRL May 25, 2011

    If they certify that the PCM is good then the clutches are worn out beyond what the PCM can compensate for - the transmission will have to be rebuild, a complex and expensive job.

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