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Discussion Starter · #1 ·
I have a 2006 G6 with a 2.4 litter and 4 speed 4t45 transmission. The problem I am having is my transmission will not shift at high RPM (5700-6000RPM). If I am on the highway and floor the gas pedal, the transimission will shift into lower gear without a problem. The problem occurs when the RPMs get up to around 5700-6000 the trans will not shift into the next gear. I will hit the Rev limiter and my motor starts to misfire. All this occurs while the gas pedal is floored. If I let up some on the pedal it will shift to the next gear. As anyone else encountered this problem? Does anyone have any suggestions to resolve this issue. Thanks for any advice.
 

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I would suspect the selector unit on the transmission where the cable connects. The high rev limiter should not activate in drive.
 

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I have a 2006 G6 with a 2.4 litter and 4 speed 4t45 transmission. The problem I am having is my transmission will not shift at high RPM (5700-6000RPM). If I am on the highway and floor the gas pedal, the transimission will shift into lower gear without a problem. The problem occurs when the RPMs get up to around 5700-6000 the trans will not shift into the next gear. I will hit the Rev limiter and my motor starts to misfire. All this occurs while the gas pedal is floored. If I let up some on the pedal it will shift to the next gear. As anyone else encountered this problem? Does anyone have any suggestions to resolve this issue. Thanks for any advice.
Don't do it in drive try it in 3 or if it has it 4
 

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Don't do it in drive try it in 3 or if it has it 4
keeping it in 3rd or 4th will not let it shift in any other gear so the problem still remains.

i would definitely take it to a mechanics shop and have them look at it because it sounds like it's an electronic problem not the transmission because it shifts after you let go of the pedal. could be a bad wiring harness inside the transmission

it's hard to tell
 

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Discussion Starter · #6 ·
Problem Solved

The problem was the catalytic converter. The converter was so plugged that it chocked the motor out at higher RPM's. I had the converter replaced under warranty at the dealer. Everything works great and the car runs like new again.
 
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