Chevrolet Silverado / GMC Sierra. Service manual — part 1032

LACK OF POWER OR HESITATION

Lack of Power or Hesitation

ON-VEHICLE REPAIR INSTRUCTIONS

TRANSMISSION CONTROL MODULE REPLACEMENT

Fig. 29: Transmission Control Module Replacement
Courtesy of GENERAL MOTORS CORP.

Pump Cover (215)

Cut or damaged oil seal rings - stator shaft

Checks

Causes

Automatic Transmission
Fluid Pressure (TFP)
Manual Valve Position
Switch (69)

Incorrect TFP signal logic for current gear position. Refer to
Transmission Fluid Pressure Manual Valve Position
Switch Logic .

NOTE:

Data below covers ON-VEHICLE repair information. For off vehicle
repair information see OFF-VEHICLE REPAIR INSTRUCTIONS.

Callout

Component Name

Transmission Control Module (TCM)

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado

RANGE SELECTOR LEVER CABLE REPLACEMENT

Removal Procedure

1. Position the steering column shift lever to the park position.

2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

1

Procedure:
A new TCM requires programming. Refer to Control Module References .
Tip:

Disconnect the TCM electrical connector.

Twisting or tilting of the transmission control module electrical connector
while disconnecting may result in bent or misaligned electrical terminal
pins.

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 TCM will need to relearn TAP
values. Transmission performance may be affected as new TAP values are
learned. Reset the TAP values. Refer to Transmission Adaptive
Functions (TCM).

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado

Fig. 30: View Of Clips On Cable From Floor Panel Reinforcement
Courtesy of GENERAL MOTORS CORP.

3. Remove the clips on the cable from the floor panel reinforcement.

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado

Fig. 31: View Of Retainer Securing Cable To Bracket
Courtesy of GENERAL MOTORS CORP.

4. Ensure the transmission manual shaft is positioned in mechanical park.

5. Remove the retainer that secures the cable to the bracket.

2008 Chevrolet Silverado 1500

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

Silverado, Sierra & Silverado