[chuxta1983]

I have an '06 gtp sedan, with the 3.9 automatic. I've taken the car to the dealer because driving down the road one day the traction control light came on in the dash. I noticed that while the light was on the transmission shifts hard. It did it one time at a stop light, and when i took off it was like you neutral dropped it, with a nice clunk when it went into gear. After this happens the cel comes on. The dealer told me that the k&n air filter was the problem and I had to clean my MAF sensor. I replaced the k&n with a conventional filter, and cleaned the MAF sensor. The car is worse than ever, of course this all occurred right at the 100000 mile mark, and now the car is over and there is no sense in taking the car back to HALEY they suck as far as service. Any help at all would be appreciated

 

[slls]

A MAF can easily be damaged when cleaning, if not careful. Go to Auto Zone or where ever to see if the MAF code is back.

 

[CalsGTP]

What are the code numbers you are getting? I have a GTP and had MAF codes, I figured the sensor was bad so I ordered one from from GMparts direct, and when I went to install it found a couple of cracked wires, so I fixed them instead and took care of my problem. If you MAF sensor that is bad I will give you a great deal on a brand new one! The only other reason my CEL has come on was for a bad O2 sensor.

 

[hubbardbk]

I found that my car's transmission is shifting hard and the "Traction Off" light stays on. It only shifts hard when the light is on (once in a blue moon it goes off). I thought I cleaned the MAF sensor well, but apparently not. Would an O2 Sensor be the cause of the hard shifts? I had it checked and I had O2 Sensor, Catalytic Converter, and MAF Sensor codes. I'm a college student so I can't really afford to replace all of these things at once. Please help!!

 

[plano_doug]

I found that my car's transmission is shifting hard and the "Traction Off" light stays on. It only shifts hard when the light is on (once in a blue moon it goes off). I thought I cleaned the MAF sensor well, but apparently not. Would an O2 Sensor be the cause of the hard shifts? I had it checked and I had O2 Sensor, Catalytic Converter, and MAF Sensor codes. I'm a college student so I can't really afford to replace all of these things at once. Please help!!

Can you get the codes read? I'm thinking this is an ABS issue (so you'll need a code reader that supports ABS).

In my experience, the computer will disable traction control when there's an ABS issue. And that issue is often just a damaged wire between the wheel speed sensor (ie, the wheel hub) and the computer.

Furthermore, hard shifting is often a sign of the transmission maxing out on the shift pressure, P1811 code, I believe. Its code description includes "max adaptive shift" as I recall. As long as it continues shifting, I wouldn't worry too much about it I'm not sure if it could also cause the Traction Off condition.

I suggest first going to a parts store and seeing if they can read some codes.

Doug

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[killroy134]

I know that this thread is all but dead, however, I had the exact same problem since buying my G6 GT 3.9 Liter.

Same codes, running lean on bank 1 and 2 and MAF sensor reading wrong. I also had the traction control go on and off continuously.

I got a code reader from AutoZone and there were no brake codes or wheel sensor codes at all. Whoever owned it before me but a new cold air intake and K&N air filter on it and that was the issue. I went to a junkyard and bought a factory one, replaced it and now it runs perfect.

WOW I was at a loss. I hope this helps someone else out. I made 100% sure the aftermarket cold air intake did not leak, but it made all the difference in the world. These 3.9s are not meant to run the chrome pipe air intakes. I don;t know why, but it does.

Killroy134