| Subject: | 2-3 Upshift Slip or Flare |
| Models: | 2007-2008 Cadillac Escalade, Escalade ESV, Escalade EXT |
| 2007-2008 Cadillac SRX, STS |
| 2006-2008 Cadillac STS-V, XLR-V |
| 2006-2008 Chevrolet Corvette |
| 2007-2008 Chevrolet Silverado |
| 2007-2008 GMC Sierra, Sierra Denali, Yukon Denali, Yukon Denali XL |
| Equipped With 6L50, 6L80 or 6L90 RPO MYB MYC or MYD Automatic Transmission |
This PI Supercedes To Update Years And Add Models. Please Discard PIP4052.
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 2-3 upshift slip or flare.
Recommendation/Instructions:
At this time this flare condition has been recognized in two different driving conditions:
- During the first 2-3 upshift after the vehicle has been sitting, engine off for several hours. This condition may be caused by air that is trapped in the 3-5-R clutch assembly. When the first 2-3 upshift is made this trapped air is purged and the
following 2-3 shifts will be normal with no flare. When diagnosing this condition a garage shift into reverse before drive will purge this air and prevent the 2-3 flare from occurring. This condition is a NORMAL characteristic of the transmission, it will
not cause durability concerns and no repair attempts should be made.
- When transmission ATF temperature is at or below 85 degrees F (30 degrees C). This 2-3 upshift flare can occur until the ATF temperature warms. If the 2-3 flare is determined to be ATF temperature sensitive use a Tech 2 to make note of the throttle
position when the flare occurs. Drive the vehicle to get ATF temperature to at least 104 degrees F (40 degrees C) and then make several 2-3 shifts at the throttle position determined to be the most sensitive to the 2-3 flare. This will allow the transmission
adapts to tailor the shifts and may help to eliminate the cold 2-3 flare. This condition is a NORMAL characteristic of the transmission, it will not cause durability concerns and no repair attempts should be made.
Note: A revised TCM calibration has been released and is available on TIS2WEB to address this concern in 2007 vehicles equipped with the 6L90 RPO MYD automatic transmission.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
