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Discussion Starter #1
Hello again all,
Wife's 08 GT 3.5 with 165K miles, every now and then will feel like the lockup converter will "chuggle" in and out under mid range steady speed and light load to the motor. I've said that I'm more of a MOPAR guy before, and found on them that the TPS will cause this on them, but have not had a MOPAR with "throttle by wire" like this GM has. Car runs perfectly and no CEL or other data glitches that my basic scanner can pick out.
Any feedback appreciated.
 

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Discussion Starter #2
BUMP....
No responses, so thought I'd add a bit more info.
My scanner does have"data stream" capability although rather basic. Will read TPS %, but not sure it's reading TB or foot pedal.My 04 Chy. minivan has cable throttle and did the same thing with it's TPS of TCC "chuggle", which with a digital VOM would NOT pick up test sweep. At 196K miles,I replaced it anyway and the TCC "chuggle" was gone.
I looked up on rockauto for TPS for the G6, and found a throttle body mounted unit at almost the same price as a complete throttle body! Thoughts are still appreciated about this subject. This MOPAR guy needs a little help from the GM side of the "aisle".... :)
 

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Discussion Starter #3
BUMP,. BUMP
Did I mention that the condition when it happens is quite noticeable and rather harsh on the feel. Only way to get out of it is to apply more pedal and "power out" of it or put it in manual and drop a gear. which my wife will NOT do.
Any thoughts...CONDOLENCES ....ridicule ??????
 

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I believe there is a separate transmission control module on the majority of the G6's that you may need a more advanced scan tool to recover codes from. Someone with a Tech II or similar may be able to get more info. It may even be worth paying a dealership or local mechanic to try and diagnose even if you plan to fix it yourself. Sorry that we cannot be of more help, it seems you are very experienced with repairs and probably know general principals better than many of us. Hope you get it fixed.
 

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Discussion Starter #5
Thanks for the reply! I've already contacted a GM friend with an advanced scanner to check things over, but hunting season is in full swing here and his "free time" is taken up with the sport right now. But he seems to think I may be on the correct path..just need an analog VOM to "sweep the TPS to see drop off of a possible worn potentiometer that the TPS is. Which was the same thing with my MOPAR...only simpler design!
I don't get to drive this G6 very often, and have told the wife what to do if it happens. And she has not said about having further happenings for a couple weeks now. And for the memberships info...The wife loves the car and I'm "coming around" with it. Just that I like staying with brands I'm comfortable with maintaining myself. As my intro to the forum said, this was a mechanics "special" needing a trannie, and the one I put in it only had 80k miles on it(yes new filter and oil when installed) MAYBE it was just "settling in" when this "chuggle" started happening.
 

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Discussion Starter #6
UPDATE: Well hunting season is in full swing with my GM friend, and I'm not having any luck with pulling the G6 away from my wife(still says it "chuggles" from time to time) to investigate. BUT have had time to research...
I am on the correct path about the TPS(on the throttle body). It is replaceable and held on with a number of spring clips. It is also NOT part of the main drive action to open/close the throttle air butterfly plate of the TB. One of the symptoms is trans shifting issues.
This part is used on a great number of GM years and motors, and I found that Standard Motor Products Part # ST445 is used for this 3.5 and MANY MANY GM applications. I've ordered one thru rockauto.com and will update further when changed(and quite easy to do).
Price thru them, and symptom and taking into account the 165K MILES and high heat area the part is subjected to makes for a good starting point to nail down this problem.
 

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Good luck with it and thanks for keeping us updated. The information will most likely be useful to others.
 

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Discussion Starter #8
UPDATE: Along with getting the TPMS and bent rim "squared away" today, my friend and I also checked the cars computer history for the drivetrain, There have been NO CEL's, but there was a TPS code in history P0255(if I remember right) and one for oil press switch.
Come payday I'll order the TPS and change it.
 

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Discussion Starter #10
Hello all.....any luck on getting your g6 fixed....im haveing similar issues. And was wondering if u figured it out?
Due to NOT being able to "pry away" the car from the wife, lack of funds(still recovering from Christmas) and the cold snowy weather...I have not done anything yet, Still happens but not a constant thing depending on distance driven and in the parameters of what Initially posted. I am 99% convinced it is the replaceable TPS(3.5motor) causing it.
 

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Due to NOT being able to "pry away" the car from the wife, lack of funds(still recovering from Christmas) and the cold snowy weather...I have not done anything yet, Still happens but not a constant thing depending on distance driven and in the parameters of what Initially posted. I am 99% convinced it is the replaceable TPS(3.5motor) causing it.
....i
Due to NOT being able to "pry away" the car from the wife, lack of funds(still recovering from Christmas) and the cold snowy weather...I have not done anything yet, Still happens but not a constant thing depending on distance driven and in the parameters of what Initially posted. I am 99% convinced it is the replaceable TPS(3.5motor) causing it.
Thank you very much . I think im going to goto the local you pull it tomorro. And pick one or two tps. And try it out and see what happens...im kinda in the exact situation.....my wife has a 2006 g6 gt. With the 3.5. 175k miles. Only issue that we have had with it was a bad bcm. It was making the break lights stay on. So i went to the local you pull it and picked one up for $10...... after i changed the bcm and put a performance exhaust on it. Thats when i noticed about the tranny....at cruising speed in 4th gear in drive. It feels like its slipping and juat like you said. The only way to pull out of it is to push alittle harder on the pedal or put it in auto stick........ i have another question. When i shift into the auto stick. Mst of the time it will not engage. Unless i shift it back and forth from drive to autostick 3 or 4 times. And when i finally get it engage in the auto stick. It will constantly kick it out of auto stick and just be a normal automatic in drive
...
.the shifter didnt move. Juat the function......any ideas what that could be perhaps. I really appriciate all of your knowledge and everyone elses that i have red over the past 2 days. I thank you
 

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Discussion Starter #12
Well good luck to you...maybe you'll come up with the part before I do and then you can post if it worked out.
I'm not big into GM nuances of these line of cars(being a MOPAR guy), so I can't say much as to the manual/ait functioning of the trans you describe.
 

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Discussion Starter #13
I FINALLY ordered a new TPS from rockauto, and it's on it's way here IF they can get it out of NYC warehouse....;) Projected delivery date for Tuesday.
Car is now home A LOT due to the Covid-19 thing. The problem has gotten a bit more pronounced with NO CEL,but TPS code in computer long term memory. Car starts and runs perfectly other than when under the conditions described earlier in postings. Will update as soon as new part is installed and test driven. Only other work done on the car was to replace the front pads and "clean up" the calipers, had worn the inner pads way down and outer pads looked like brand new. Wife loves her G6!
 

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Discussion Starter #14
4/13/20 UPDATE:
To close this thread out...It WAS the throttle body mounted TPS. replaced and road tested for 40+ miles and NO TROUBLE at all!
 
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