Question about 2000 Pontiac Bonneville

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Torque converter shudders when it attempts to lock up. bad converter or lock up solenoid? shut off lock up with scan tool and shutter goes away.

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  • mlamont11 Jul 21, 2010

    no codes. filter and fluid have been replaced. 190K.

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The test you have done will not determine which one is the cause of the problem. I have found that the solenoid is faulty 99% of the time. However more information on the vehicle could be helpful. How many miles on the vehicle? Has the transmission fluid ever been changed in the past? The solenoid may have become dirty with sediment or debris. Flushing the transmission can help with this problem. Normally if the solenoid fails the computer will set a service engine light code and store it in the computer. The code that is set may help to isolate the problem.

Posted on Jul 21, 2010

  • sam postema Jul 22, 2010

    What you need to do is drive vehicle on hwy at speeds around 55 mph and look on your scan data for lock up solenoid data.
    What you want to see the torque converter locking up at a constant speed usually around 50-55 mph. I believe it changes from p0 to p1.

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