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.
Drive Mode Description and Operation: Notes
The drive mode system is a customer configurable control that allows the vehicle operator to tailor the vehicle operation and driveabiity parameters based on driving conditions. The drive mode is controlled by the vehicle operator through the S126 Drive Mode Select Switch. The S126 Drive Mode Select Switch is a single throw, double pole rocker switch. Pressing the switch up and down will change to the next drive mode.
The S126 Drive Mode Select Switch is an input to the K20 Engine Control Module. When the switch is pressed, the K20 Engine Control Module will broadcast a message to all modules indicating the requested drive mode. Control modules that are involved in changing their operation based on differing drive modes will then change their operating values.
The components of the drive mode are:
- S126 Drive Mode Select Switch
- K20 Engine Control Module
Other control modules or components that may respond to the commanded drive mode are:
- K17 Electronic Brake Control Module
- K19 Suspension Control Module
- K38 Chassis Control Module
- K43 Power Steering Control Module
- K47 Rear Differential Clutch Control Module
- K71 Transmission Control Module
- P16 Instrument Cluster
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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.