Question about 2005 Suzuki Aerio SX
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
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Posted on Jan 02, 2017
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