A/T - Tech 2 Shift Adapt Clearing
File In Section: 07 - Transmission/TransaxleBulletin No.: 01-07-30-018
Date: April, 2001
INFORMATION
Subject:
Tech 2 Information on 4L60-E Shift Adapts
(Clearing Shift Adapts)
Models:
2002 Chevrolet Trailblazer
2002 GMC Envoy
2002 Oldsmobile Bravada
with 4L60-E Automatic Transmission (RP0 M30)
and 4.2 L Engine (VIN S - RP0 LL8)
The above listed vehicles have PCM software that does not allow the Tech 2 to display or clear shift adapts. Even though the shift adapts will not display, they will function as expected. Since the shift adapts modify line pressure, it is required to clear them during a significant transmission repair.
Important:
If the adapts are not cleared, the customer may comment on either soft or harsh shifts after a major repair.
To clear the shift adapts, it is necessary to disconnect power to the Powertrain Control Module (PCM) for 35 minutes. Refer to the Powertrain Control Module (PCM) Replacement procedure in the Service Information.
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