Question about 2005 Toyota Corolla
There is a known issue with the 2005-2007 Corolla automatic transmission shift logic. The shift points may seem harsh, and the Check Engine light may be illuminated.
There is a technical service bulletin published (TC015-07) that will address and rectify this condition.
The diagnostic code P2716 will be stored in the computer memory. The procedure involves replacing the Engine Control Module (the computer) with an updated unit.
The repair is covered, under the factory warranty, for 96 months, or 80,000 miles, which ever comes first.
I hope that this helps you Corolla owners out.
A "FixYa" rating (4 blue diamonds) would be greatly appreciated for my assistance on your issue. Thanks in advance.
Posted on Feb 21, 2009
SOURCE: Pressure Control Solenoid P2716
have the code checked especially if the car is out of warranty. If it is still under warranty take the car to the dealership
. The Pressure Control Solenoid determines the quality and accuracy of the shift points and if you let it go the transmission will not shift properly after a period of time.
The pressure control solenoid is used by the PCM to raise the mainline hydraulic pressure during high throttle - this increases the holding force on the clutches and bands and prevents slipping. The pressure control solenoid is controlled by pulses from the PCM and this in turn operates the boost valve insde the valve body.
The problem could be either in the PCM or it could be an electrical problem with the solenoid. As suggested it should be diagnosed by a transmission tech. They can check if the PCM is good by looking at the pulses with an oscilloscope at the connector and they should also be able to test the continuity of the solenoid. If the solenoid is faulty the valve body will need to be removed and the solenoid replaced.
Posted on Apr 04, 2010
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