Running Board for 2020 GMC Sierra 1500
1. Step Bar Assembly 
2. 6-Inch Rectangular Wheel-to-Wheel Assist 
3. Molded Assist Steps, Black 
4. Molded Assist Steps, Black, 4-Inch Round 
5. 4-Inch Round Assist Steps - Black - Crew Cab 
6. Work Step Assist Steps - Black - Crew Cab 
7. Right 
8. Sport Step Assist Steps 
9. Sport Assist Steps, Black with Sierra Script 10. Step Bar Assembly Rear Cap No.
Part # / Description / Price
Price
1
Passenger Side Assist Step 
GM
GM Positions: Right
Description: Crew cab, power retractable. Assists with access into and out of your vehicle
This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
.
Collision parts are designed to help promote proper and safe repair
$1,819.73
$1,819.73
1
$949.16
2
Step Bar GM
GM Positions: Left
Notes: PARTS: Part included with step bar assembly.
Description: Crew cab, power retractable.
$660.62
$660.62
2
Step Bar GM
GM Positions: Right
Notes: PARTS: Part included with step bar assembly.
Description: GM Genuine Parts Motor (Part Number: 85659274) is an assist-step motor assembly used in power-assist mechanisms. Application: Crew cab power retractable configurations—used to drive assist-step operation.Function: Provides actuation for retracting or ext ...
$660.62
$660.62
3
Driver Side Assist Step Front Finish Cap GM
GM Positions: Left
Notes: PARTS: Part included with step bar assembly.
Description: GM Genuine Parts Driver Side Assist Step Front Finish Cap (Part Number: 84266747) is a finish cap for a power retractable assist step providing a finished appearance and replacement for worn or missing caps. Backed by General Motors (GM). Function: Decorat ...
MSRP $60.84
$42.83
MSRP $60.84
$42.83
3
Step Bar Front Cap GM
GM Positions: Right
Notes: PARTS: Part included with step bar assembly.
Description: GM Genuine Parts Step Bar Front Cap (Part Number: 84266748) is an OE-style end cap for power-retractable step bars that finishes the front end appearance and provides a secure closure. Function: Finishes and secures the front end of the step/running board ...
MSRP $60.84
$42.83
MSRP $60.84
$42.83
3
Assist Step Front Finish Cap Passenger Side Front Or Driver Side Rear GM
GM Positions: Front right
Description: GM Genuine Parts Assist Step Front Finish Cap (Part Number: 84173417) is the finished cap installed in the assist step assembly to conceal fasteners and provide a finished appearance. OE-fit cap for specified cab types and step styles.Type: Step Bar Front ...
MSRP $62.91
$44.30
MSRP $62.91
$44.30
3
Assist Step Finish Cap GM
GM Positions: Front right
Description: GM Genuine Parts Assist Step Finish Cap (Part Number: 84212675) is a finish cap for assist step assemblies that gives a factory appearance and protects mounting ends. Function: Provides a finished appearance for assist/step bar ends and helps protect edges ...
MSRP $50.55
$35.59
MSRP $50.55
$35.59
4
Assist Step Front Extension GM
GM Positions: Left
Notes: PARTS: Part included with step bar assembly.
Description: GM Genuine Parts Assist Step Front Extension (Part Number: 84409838) is a factory front extension component for crew cab power retractable assist steps. Engineered to OEM specifications for proper integration with the retractable step assembly and reliable ...
MSRP $229.08
$150.41
MSRP $229.08
$150.41
4
Running Board Reinforcement Bracket GM
GM Positions: Rear
Description: Crew cab, power retractable. Helps align and secure your vehicle's running board
This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
Collision parts are designed to help promote proper and safe repair
$37.85
$37.85
4
Driver Side Assist Step Front Extension GM
GM Positions: Front left
Description: GM Genuine Parts Driver Side Assist Step Front Extension (Part Number: 23321126) is a front extension component for crew-cab power retractable assist steps, providing a clean factory look and restoring proper step deployment. Function: Extension piece for ...
MSRP $245.38
$161.11
MSRP $245.38
$161.11
5
Front Bracket Insulator GM
GM Positions: Left
Notes: PARTS: Part included with step bar assembly.
Description: Crew cab power retractable.
$13.85
$13.85
6
Passenger Side Assist Step Front Extension GM
GM Positions: Right
Notes: PARTS: Part included with step bar assembly.
Description: GM Genuine Parts Passenger Side Assist Step Front Extension (Part Number: 23321127) is a front extension component for a passenger-side assist step, intended to restore step coverage and function. Type: Assist step front extensionFunction: Restores retract ...
MSRP $239.85
$157.48
MSRP $239.85
$157.48
7
Driver Side Assist Step Front Extension GM
GM Positions: Left
Notes: PARTS: Part included with step bar assembly.
Description: GM Genuine Parts Driver Side Assist Step Front Extension (Part Number: 84613787) is a genuine extension component for power-retractable assist steps, designed to restore step function and appearance. Function: Extends the front portion of the assist step a ...
MSRP $230.66
$151.45
MSRP $230.66
$151.45
7
Rear Extension GM
GM Positions: Right
Notes: PARTS: Part included with step bar assembly.
Description: GM Genuine Parts Rear Extension (Part Number: 84613788) is a rear extension assembly for power retractable running boards designed to mount and support the retractable step mechanism. Function: Extension component for crew cab power retractable running boa ...
MSRP $232.25
$152.49
MSRP $232.25
$152.49
11
Driver Side Assist Step Switch GM
GM Positions: Left
Notes: PARTS: Part included with step bar assembly.
Description: GM Genuine Parts Driver Side Assist Step Switch (Part Number: 84266749) is a switch assembly for power-retractable assist steps on crew-cab trucks. It enables control of step deployment and retraction for convenience and safety. Function: Switch assembly f ...
MSRP $131.41
$86.67
MSRP $131.41
$86.67
11
Passenger Side Assist Step Switch GM
GM Positions: Right
Notes: PARTS: Part included with step bar assembly.
Description: GM Genuine Parts Passenger Side Assist Step Switch (Part Number: 84266750) is a switch assembly used to operate a power-retractable assist step. It provides control for deploying or retracting the assist step on crew-cab trucks. Function: Switch to operate ...
MSRP $131.41
$86.67
MSRP $131.41
$86.67
12
Wire GM
GM Positions: Left
Notes: PARTS: Part included with step bar assembly.
Description: GM Genuine Parts Wire (Part Number: 84266751) is an assembly wire intended for retractable step or hinge-related electrical functions in crew-cab vehicle configurations. Type: Harness / Wire AssemblyFunction: Provides electrical routing for retractable ste ...
MSRP $157.92
$104.16
MSRP $157.92
$104.16
12
Wire GM
GM Positions: Right
Notes: PARTS: Part included with step bar assembly.
Description: GM Genuine Parts Wire (Part Number: 84266752) is an assembly wire for accessory or seating electrical systems, intended for crew cab power retractable features. Supplied to OEM standards for routing and connectivity. Function: Electrical wiring assembly fo ...
MSRP $157.92
$104.16
MSRP $157.92
$104.16
13
Module GM
GM Positions: Right
Notes: PARTS: Part included with step bar assembly.
Description: GM Genuine Parts Module (Part Number: 84835967) is an OEM electronic module used to control a power-retractable step or related accessory in specific vehicle configurations. Function: Controls retraction and extension sequences for power retractable step s ...
MSRP $588.04
$384.69
MSRP $588.04
$384.69
14
Passenger Side Running Board Mounting Bracket GM
GM Positions: Right
Notes: PARTS: Part included with step bar assembly.
Description: Helps align and secure assist step
This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors
.
Collision parts are designed to help promote proper and safe repair
MSRP $115.49
$76.17
MSRP $115.49
$76.17