auto trans jerks a bit goin from 1st to 2nd gear with slow speeds
08-26-2017, 01:28 PM
#1
3rd Gear
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auto trans jerks a bit goin from 1st to 2nd gear with slow speeds
this only happens if im at a red light and once it turns green and if I slowly accelerate theres a bit of a jerk going from 1st to 2nd, but if I accelerate normally its fine. is it normal?
Last edited by veyastar; 08-26-2017 at 01:29 PM.
08-26-2017, 06:34 PM
#2
Pro
08-26-2017, 07:54 PM
#3
Sounds like the infamous shift flare. There was a GM memo released about it (PIP-4395). GM replaces a seal in the transmission pump to supposedly fix it. Some say that if you put the trans in the relearn mode with a Tech2 that it will fix if for a while, but it may come back.
https://www.corvetteforum.com/forums...ip-4395-a.html
https://www.corvetteforum.com/forums...ip-4395-a.html
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some customers may comment on a flare or harsh 2-3 shift.
Recommendation/Instructions:
This condition may be caused by leaking 1-2-3-4 and 3-5-R clutch fluid seal rings (230). The following conditions are indications that the fluid seal rings may be leaking:
• Delayed/extended or delayed with harsh feel initial Park to Drive and/or Reverse to Drive shifts, that are more likely to occur when the transmission temperature is below approximately 40 degree C (104 degree F).
• Harsh or flaring 2-3 shifts that are more likely to occur when the transmission fluid temperature is in the approximately 0 degree C (32 degree F) to 40 degree C (104 degree F) temperature range, but can be present at any temperature.
• Harsh 2-3 shifts that are more likely to occur at less than 50% tp.
Vehicles built in the January through August, 2007 time frame are more likely to have leaking fluid seal rings
Important: When inspecting the 1-2-3-4 and 3-5-R clutch fluid seal rings (230) there probably will not be visible signs that the seal rings are damaged.
If any of the conditions above describe the flare/harsh 2-3 shift condition replace the 1-2-3-4 and 3-5-R clutch fluid seal rings (230), DO NOT replace the valve body or TCM.
Condition/Concern:
Some customers may comment on a flare or harsh 2-3 shift.
Recommendation/Instructions:
This condition may be caused by leaking 1-2-3-4 and 3-5-R clutch fluid seal rings (230). The following conditions are indications that the fluid seal rings may be leaking:
• Delayed/extended or delayed with harsh feel initial Park to Drive and/or Reverse to Drive shifts, that are more likely to occur when the transmission temperature is below approximately 40 degree C (104 degree F).
• Harsh or flaring 2-3 shifts that are more likely to occur when the transmission fluid temperature is in the approximately 0 degree C (32 degree F) to 40 degree C (104 degree F) temperature range, but can be present at any temperature.
• Harsh 2-3 shifts that are more likely to occur at less than 50% tp.
Vehicles built in the January through August, 2007 time frame are more likely to have leaking fluid seal rings
Important: When inspecting the 1-2-3-4 and 3-5-R clutch fluid seal rings (230) there probably will not be visible signs that the seal rings are damaged.
If any of the conditions above describe the flare/harsh 2-3 shift condition replace the 1-2-3-4 and 3-5-R clutch fluid seal rings (230), DO NOT replace the valve body or TCM.
Last edited by CSixDude; 08-26-2017 at 07:57 PM.