2.4L 4T45E Transmission Adaptive Pressure Shifting Corrupt?
10-15-2015, 12:42 PM
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2.4L 4T45E Transmission Adaptive Pressure Shifting Corrupt?
Good morning,
I have a 2008 Cobalt with a TCC that like to lock/unlock on flat ground and a constant speed. (I have a log of this). I tweaked some of the TCC max and min DC values and the problem went away for about 650 miles (one trip). I did some basic tests on my TCC and it seems to behaving correctly. I have read that the T42 has had logic issues with the Transmission Adaptive Pressure Shifting logic. I want to see if my problem is actually TAPS or something else. The reason I believe it went away at first is because that was the first tune I have ever put on my module thus resetting the TAPS logic. Now that I have ran some time with it the logic is recorrupting like a corrupt memory address. If I do a write entire will that reset my TAPS values again? or will it harm anything? My thoughts are if I can confirm that it is corrupt logic, Ill just buy a different TCM which brings me to my next question. Can I buy a T42 from the bone yard with matching service numbers and re-vin it for my vehicle? Then write entire to have the proper calibration on it? Or is it just easier to order one programmed for my vehicle specifically?
If anybody could give me some insight it would be greatly appreciated!
I have a 2008 Cobalt with a TCC that like to lock/unlock on flat ground and a constant speed. (I have a log of this). I tweaked some of the TCC max and min DC values and the problem went away for about 650 miles (one trip). I did some basic tests on my TCC and it seems to behaving correctly. I have read that the T42 has had logic issues with the Transmission Adaptive Pressure Shifting logic. I want to see if my problem is actually TAPS or something else. The reason I believe it went away at first is because that was the first tune I have ever put on my module thus resetting the TAPS logic. Now that I have ran some time with it the logic is recorrupting like a corrupt memory address. If I do a write entire will that reset my TAPS values again? or will it harm anything? My thoughts are if I can confirm that it is corrupt logic, Ill just buy a different TCM which brings me to my next question. Can I buy a T42 from the bone yard with matching service numbers and re-vin it for my vehicle? Then write entire to have the proper calibration on it? Or is it just easier to order one programmed for my vehicle specifically?
If anybody could give me some insight it would be greatly appreciated!
10-15-2015, 08:57 PM
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How did you disable your adaptive pressure? I did try to 100/90 but it just seemed so aggressive. Do you still run lockout in 3rd then? How many miles have you put on your transmission running this setup if you don't mind me asking?
10-15-2015, 11:40 PM
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