how to fix my GMC Sierra T1XX (2019-Present) if the cruise control isn't working

GMC Sierra T1XX (2019-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

620 words

Problem Statement

Learn how to diagnose 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 shock or short circuits.
•Allow any components to cool before handling if the vehicle has been running.

Symptoms

•Cruise control indicator light is not illuminated on the dashboard
•Inability to engage cruise control when the button is pressed
•Cruise control disengages unexpectedly while driving
•Unresponsive throttle when attempting to set cruise control
•Possible messages or warnings on the driver information center

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any related issues with the cruise control system.
2
Inspect the cruise control switch on the steering wheel for any physical damage or malfunction.
3
Check the brake pedal switch to ensure it is functioning correctly, as it disengages cruise control when the brake is pressed.
4
Examine the vehicle's fuses related to the cruise control system for any blown fuses.
5
Test the throttle position sensor to confirm it is sending accurate signals to the engine control module.
6
Inspect wiring and connectors associated with 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
•Screwdrivers

Parts Required

•Cruise control switch
•Brake pedal switch
•Fuses (if blown)

Related Faults

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Symptoms

•Cruise control indicator light is not illuminated on the dashboard

•Inability to engage cruise control when the button is pressed

•Cruise control disengages unexpectedly while driving

•Unresponsive throttle when attempting to set cruise control

•Possible messages or warnings on the driver information center

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any related issues with the cruise control system.
2
Inspect the cruise control switch on the steering wheel for any physical damage or malfunction.
3
Check the brake pedal switch to ensure it is functioning correctly, as it disengages cruise control when the brake is pressed.
4
Examine the vehicle's fuses related to the cruise control system for any blown fuses.
5
Test the throttle position sensor to confirm it is sending accurate signals to the engine control module.
6
Inspect wiring and connectors associated with the cruise control system for corrosion or loose connections.

Solution

1. Preparation

Gather all necessary tools and parts.
Disconnect the negative battery cable to ensure safety during repairs.
Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, screwdrivers.

2. Inspect and Replace Cruise Control Switch

Remove the airbag module:
- Disconnect the battery and wait 10 minutes for capacitors to discharge.
- Remove screws securing the airbag module and carefully disconnect the airbag connector.
Remove the steering wheel cover:
- Unscrew and remove any fasteners to access the cruise control switch.
Replace the cruise control switch:
- If damaged, replace with a new switch, ensuring it’s securely connected.
Reassemble:
- Reattach the steering wheel cover and airbag module, ensuring all connectors are secure.

3. Check and Replace Brake Pedal Switch

Locate the brake pedal switch:
- Usually found above the brake pedal, secured by a clip.
Test the switch:
- Use a multimeter to check if the switch is functioning properly. If not, replace it.
Reinstall:
- Ensure the new switch is adjusted properly to engage when the pedal is pressed.

4. Inspect and Replace Fuses

Locate the fuse box:
- Refer to the owner’s manual for the exact location and identify the cruise control fuse.
Check the fuse:
- Replace any blown fuses with the same amperage rating.
Reassemble the fuse box cover:
- Ensure it is securely closed.

5. Test Throttle Position Sensor

Access the throttle body:
- Remove any air intake components as necessary.
Test the sensor:
- Use a multimeter to check for proper voltage readings at the sensor. Replace if faulty.
Reassemble:
- Reattach the air intake components securely.