Question about 2005 Suzuki Aerio SX

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2004 aerio 122000 mi.will down shift at various speeds on flat road.Does this even on highway also w/ od off

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  • jrdlees Mar 30, 2011

    Thanks,It was scaned. a old history code showed up.Machanic said volts or amps were not right.Suggested replacing range sensor. Twice to dealer they said it was normal for that car .Thanks Jordie

  • jrdlees Mar 31, 2011

    thank you .much help



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The transmission in this car is shifted by a signal from a computer called the TCM (Transmission Control Module), the TCM may be part of the PCM (Powertrain Control Module) which is the main computer in the car that runs the fuel injection and engine emission control systems as well as the transmission shifting functions in most cars. When a shifting problem like this occurs your 1st step is to have the the electronic controls system tested for fault codes to explain the erratic shifting, it could be a Vehicle speed sensor (VSS) failing or a shorted shift solenoid valve inside the transmission or a defective connector at the transmission from the TCM, so get the test run. It is my understanding that Aamco Transmission will do this testing for free, and recommend what might be causing the shift concern you have. My advice for things you can check is disconnect the large electrical connector at the transmission case and see if it is corroded or has water infiltration, if so clean it and reinstall.

Posted on Mar 30, 2011

  • yadayada
    yadayada Mar 30, 2011

    Yes a poor connection or a defective transmission range sensor could cause this, but you should have had a code for that. You may have a defective TCM, but a well qualified Suzuki electronics systems tech needs to confirm that, the modules are VERY expensive.

  • yadayada
    yadayada Mar 30, 2011

    Has the Throttle Position Sensor (TPS) every been replaced? if the signal from the sensor fluctuates the computer thinks you are opening and closing the throttle blade and this can cause the transmission to shift seemingly for no reason. Another question has a technician ever conformed this problem with a system flight recorder hooked up? this special piece of test gear is dealer only in most cases due to the high cost, it enables a technicain to confirm the problem on a test drive, record it electronically and then go back to the shop and bring all the system data up on a computer screen to see what is going on and causing the problem. The key question here has any technician ever confirmed this shifting issue?



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