Drivetrain Transmission Electronics

A part of the Electronic Control Unit (ECU), the Transmission Control Unit covers everything related to the transmission of your 2003 GMC Envoy. It ensures smooth gear shifts and optimal fuel economy and performance.It has the same principle as an ECU. Using input sensors it gathers data then compares it to its onboard memory and then sends out a signal accordingly to manage the output to what its memory recommends. All this is done to keep the performance optimal.

Electronic systems have become an increasingly large component of the cost of an automobile, from only around 1% of its value in 1950 to around 30% in 2010.Modern electric cars rely on power electronics for the main propulsion motor control, as well as managing the battery system. Future autonomous cars will rely on powerful computer systems, an array of sensors, networking, and satellite navigation, all of which will require electronics.

These control the transmission system, mainly the shifting of the gears for better shift comfort and to lower torque interrupt while shifting. Automatic transmissions use controls for their operation, and also many semi-automatic transmissions having a fully automatic clutch or a semi-auto clutch (declutching only). The engine control unit and the transmission control exchange messages, sensor signals and control signals for their operation.

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Dorman 600-903
Please Note:

Some images might not represent the actual product

Dorman 600-903 Transfer Case Motor
for 2003 GMC Envoy SLT

$236.36

Save: $30.83
Sale Price:

$205.53

Estimated Ship Date: Today

Free DelieveryFree Ground Shipping
In Stock - 1 New In Stock
EngineFit NotesFitment Notes
2003 GMC Envoy SLT equipped with
4.2L l6 Gas DOHC
 
[Transfer Case Motor] w/RPO Code NP8 (2 Speed
Push Button Shift
Transfer Case)
Fits New Process 226
Rectangular Plug w/7 Pins
Quantity needed per vehicle: 1
Sport Utility 4-Door
 
2003 GMC Envoy SLT equipped with
4.2L l6 Gas DOHC [Transfer Case Motor] w/RPO Code NP8 (2 Speed
Push Button Shift
Transfer Case)
Fits New Process 226
Rectangular Plug w/7 Pins
Quantity needed per vehicle: 1
Sport Utility 4-Door
,
Dorman 901-064
Please Note:

Some images might not represent the actual product

Dorman 901-064 Four Wheel Drive Switch
for 2003 GMC Envoy SLT

$25.30

Save: $3.30
Sale Price:

$22.00

Estimated Ship Date: Today

In Stock - 4 New In Stock
EngineFit NotesFitment Notes
2003 GMC Envoy SLT equipped with
4.2L l6 Gas DOHC
 
Dash Mounted
2002-09 GMC Envoy Four Wheel Drive Switch
Sport Utility 4-Door
 
2003 GMC Envoy SLT equipped with
4.2L l6 Gas DOHC Dash Mounted
2002-09 GMC Envoy Four Wheel Drive Switch
Sport Utility 4-Door
,
Dorman 14055
Please Note:

Some images might not represent the actual product

DORMAN 14055 Shift Linkage Bushing
for 2003 GMC Envoy SLT

$15.27

Save: $1.99
Sale Price:

$13.28

Estimated Ship Date: Today

In Stock - 2 New In Stock
EngineFit NotesFitment Notes
2003 GMC Envoy SLT equipped with
4.2L l6 Gas DOHC
 
[Auto Trans Shift Cable Bushing] 2 Pc Assortment
Quantity needed per vehicle: 1
Sport Utility 4-Door
 
2003 GMC Envoy SLT equipped with
4.2L l6 Gas DOHC [Auto Trans Shift Cable Bushing] 2 Pc Assortment
Quantity needed per vehicle: 1
Sport Utility 4-Door