Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC2021SIERRA 3500 HD DENALI, 6.6L ENG VIN YREPAIR AND DIAGNOSISGENERAL INFORMATIONOEM GENERAL INFORMATIONVEHICLE DIAGNOSTIC SCAN TOOL INFORMATION (1 OF 2)SPECIFICATIONSK4 ASSIST STEP CONTROL MODULE: SCAN TOOL INFORMATION
2021 GMC Sierra 3500 HD Denali, 6.6L Eng VIN Y
K4 Assist Step Control Module: Scan Tool Information
2021 GMC Sierra 3500 HD Denali, 6.6L Eng VIN YSECTION K4 Assist Step Control Module: Scan Tool Information
Scan Tool Data Parameters
| Parameter | Expected Value | Description |
|---|---|---|
| Operating Conditions: Ignition ON | ||
| Battery Voltage | Varies | Current voltage of battery. |
| Assist Step System Status | Normal | Scan tool displays Unknown, Enabled, Disabled, or Extended. |
| Driver Door Ajar Switch | Door Closed | Scan tool displays Door Closed or Door Open. |
| Passenger Door Ajar Switch | Door Closed | Scan tool displays Door Closed or Door Open. |
| Left Rear Door Ajar Switch | Door Closed | Scan tool displays Door Closed or Door Open. |
| Right Rear Door Ajar Switch | Door Closed | Scan tool displays Door Closed or Door Open. |
| Left Assist Step Learn Status | Yes | Scan tool displays Learned if the left step learn has been completed. |
| Left Assist Step Position | Count Value | Scan tool displays the current left step position count. |
| Right Assist Step Learn Status | Yes | Scan tool displays Learned if the right step learn has been completed. |
| Right Assist Step Position | Count Value | Scan tool displays the current right step position count. |
| Right Assist Step Command | Retract Completed | Scan tool displays Unknown, Extend Completed, Retract Completed, Extending, Retracting, Error, Object Detected, or Timeout. |
| Left Assist Step Command | Retract Completed | Scan tool displays Unknown, Extend Completed, Retract Completed, Extending, Retracting, Error, Object Detected, or Timeout. |
| Assist Step Disable Switch | Inactive | Displays Active if switch is pressed. |
| Left Assist Step Kick Switch | Inactive | Displays Active if switch is pressed. |
| Right Assist Step Kick Switch | Inactive | Displays Active if switch is pressed. |
Scan Tool Output Controls
| Output Control | Description |
|---|---|
| Left Assist Step Motor | Allows scan tool control of left assist step. |
| Right Assist Step Motor | Allows scan tool control of right assist step. |
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.