Chevrolet Silverado / GMC Sierra. Manual — part 1065

Replacement.

24. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM).

CONTROL AND SHIFT SOLENOIDS REPLACEMENT

Removal Procedure

IMPORTANT: It is recommended that transmission adaptive pressure (TAP)

information be reset.
Resetting the TAP values using a scan tool will erase all
learned values in all cells. As a result, the engine control
module (ECM), powertrain control module (PCM) or
transmission control module (TCM) will need to relearn TAP
values. Transmission performance may be affected as new
TAP values are learned.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

Fig. 155: Identifying Valve Body Electrical Connections
Courtesy of GENERAL MOTORS CORP.

1. Remove the transmission filter. Refer to Automatic Transmission Fluid and Filter

Replacement.

2. Remove the 1-2 accumulator, if necessary. Refer to Accumulator Assembly, Spacer

Plate, and Gaskets.

3. Disconnect the internal wiring harness electrical connectors from the following components:

IMPORTANT: Removal of the 1-2 accumulator is necessary only if

servicing the pressure control solenoid.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado