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.
P1593 - Speed Control Switch 1/2 Stuck: Notes
For a complete wiring diagram, refer to appropriate wiring diagram.
Theory of Operation
The Speed Control Switch is hardwired to the Steering Column Control Module (SCCM). The SCCM is located near the top of the steering column below the steering wheel. The SCCM includes the steering column shroud, the Steering Angle Sensor (SAS), the Clockspring, the Multifunction Switch, a Steering Column Power Tilt and Telescope Switch (if equipped), and a trim cover. The speed control messages are bussed to the Powertrain Control Module (PCM) via the Can Bus.
- >>When Monitored:<< Continuously with the ignition on.
- >>Set Condition:<< Fault signifies when the switch voltage does not register a valid cruise position.
| Possible Causes |
|---|
| SPEED CONTROL SWITCH |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to Engine .
NO RELATED
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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.