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

GMC Sierra T1XX (2019-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

523 words

Problem Statement

Learn how to diagnose and fix cruise control issues in GMC Sierra T1XX (2019-present). Step-by-step guide with symptoms, diagnostic steps, 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 components to avoid shocks or shorts.
•Allow the vehicle to cool down before starting any work under the hood.

Symptoms

•Cruise control indicator light not illuminating
•Cruise control fails to engage when activated
•Inability to set or adjust speed using cruise control
•Check engine light illuminated (if related fault is present)
•Sudden disengagement of cruise control while in use

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any related faults.
2
Inspect the cruise control switch for physical damage or wear.
3
Check the vehicle speed sensor for proper operation.
4
Verify the brake light switch functionality and adjustment.
5
Examine the wiring and connectors related to the cruise control system for corrosion or damage.
6
Test the throttle position sensor for correct output.

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
•Socket set
•Screwdriver
•Multimeter

Parts Required

•Cruise control switch (if defective)
•Brake light switch (if defective)
•Vehicle speed sensor (if defective)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any related faults.
2
Inspect the cruise control switch for physical damage or wear.
3
Check the vehicle speed sensor for proper operation.
4
Verify the brake light switch functionality and adjustment.
5
Examine the wiring and connectors related to the cruise control system for corrosion or damage.
6
Test the throttle position sensor for correct output.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to eliminate electrical hazards.
Ensure the vehicle is parked on a level surface with the ignition off.

2. Inspect and Replace the Cruise Control Switch

Tools Required: Socket set, multimeter
Remove the steering column cover using a socket set.
Disconnect the cruise control switch connector.
Use a multimeter to test the switch for continuity. If defective, replace with a new switch.
Reconnect the switch and reassemble the steering column cover.

3. Check and Replace the Brake Light Switch

Tools Required: Socket set, screwdriver
Locate the brake light switch, typically mounted near the brake pedal.
Inspect the switch for any visible damage or misalignment. If faulty, remove it using a socket set.
Install the new brake light switch in the correct position and adjust it so that it activates properly when the pedal is pressed.
Reconnect the wiring harness.

4. Test the Vehicle Speed Sensor

Tools Required: OBD-II scanner
Reconnect the battery and start the vehicle.
Use the OBD-II scanner to monitor the vehicle speed sensor readings while driving.
If the readings are inconsistent or show zero speed, replace the vehicle speed sensor.

5. Final Checks

Reconnect the battery and ensure all components are secure.
Clear any diagnostic trouble codes from the system using the OBD-II scanner.