how to troubleshoot the GMC Sierra T1XX (2019-Present) cruise control not working?

GMC Sierra T1XX (2019-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

526 words

Problem Statement

Learn how to troubleshoot and fix cruise control issues in GMC Sierra T1XX (2019-Present). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to avoid short circuits or shocks.

Symptoms

•Cruise control indicator light is not illuminated on the dashboard
•Inability to set or adjust cruise control speed
•Cruise control disengages unexpectedly while driving
•Check engine light may be illuminated
•Warning message displayed on the driver information center

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any related fault codes.
2
Inspect the cruise control switch for physical damage or wear.
3
Check the brake pedal switch operation, ensuring it is functioning correctly.
4
Verify the vehicle speed sensor (VSS) is providing accurate speed readings.
5
Inspect the fuses related to the cruise control system for any blown fuses.
6
Check the wiring and connectors for the cruise control system for corrosion or loose connections.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Multimeter
•Socket set
•Torque wrench
•Screwdriver set
•Wiring diagram for cruise control system

Parts Required

•Cruise control switch (if faulty)
•Brake pedal switch (if faulty)
•Vehicle speed sensor (if faulty)
•Fuses (if blown)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any related fault codes.
2
Inspect the cruise control switch for physical damage or wear.
3
Check the brake pedal switch operation, ensuring it is functioning correctly.
4
Verify the vehicle speed sensor (VSS) is providing accurate speed readings.
5
Inspect the fuses related to the cruise control system for any blown fuses.
6
Check the wiring and connectors for the cruise control system for corrosion or loose connections.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the vehicle’s battery to ensure safety while working on electrical components.

Tools Required:

OBD-II scanner
Multimeter
Socket set
Torque wrench
Screwdriver set
Wiring diagram for cruise control system

2. Inspect Cruise Control Switch

Remove the steering wheel cover to access the cruise control switch.
Disconnect the switch connector and use a multimeter to test for continuity when the switch is engaged.
If the switch is faulty, replace it with a new one.

3. Check Brake Pedal Switch

Locate the brake pedal switch and inspect for proper alignment and operation.
Use a multimeter to ensure the switch closes when the brake pedal is pressed.
If the switch is defective or misaligned, adjust or replace it.

4. Verify Vehicle Speed Sensor

Locate the vehicle speed sensor and inspect its wiring and connector.
Use a multimeter to check the sensor's output while the vehicle is in motion.
If the sensor is malfunctioning, replace it with a new one.

5. Inspect Fuses and Wiring

Locate the fuse box and check for any blown fuses related to the cruise control system.
Replace any blown fuses with the correct amperage.
Inspect the wiring harness for any damaged or corroded connectors; repair or replace as necessary.