GMC Sierra T1XX (2019-Present) traction control light keeps coming on, why?

GMC Sierra T1XX (2019-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

Error Code: C0035

3 min read

578 words

Problem Statement

Learn how to diagnose and fix C0035 traction control light issues in GMC Sierra T1XX. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

C0035

Affected Component

Brakes

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Allow the vehicle to cool before performing inspections under the hood.

Symptoms

•Traction control light illuminated on the dashboard
•Reduced engine power during acceleration
•Unusual wheel spin or slippage during acceleration
•Erratic handling or stability during turns
•Possible warning messages on the display indicating traction control issues

Diagnostic Steps

1
Scan the vehicle’s onboard computer for Diagnostic Trouble Codes (DTCs) using an OBD-II scanner.
2
Inspect the wheel speed sensors for dirt, damage, or loose connections.
3
Check the condition and level of brake fluid in the master cylinder reservoir.
4
Inspect the ABS (Anti-lock Braking System) module for any faults.
5
Verify that the tires are of equal size and properly inflated, as mismatched tires can trigger the traction control system.
6
Test the vehicle's battery voltage and condition, as low voltage can affect the traction control system operation.

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
•Brake cleaner
•Tire pressure gauge

Parts Required

•Wheel speed sensor (if faulty)
•Brake fluid (DOT 3 or DOT 4)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan the vehicle’s onboard computer for Diagnostic Trouble Codes (DTCs) using an OBD-II scanner.
2
Inspect the wheel speed sensors for dirt, damage, or loose connections.
3
Check the condition and level of brake fluid in the master cylinder reservoir.
4
Inspect the ABS (Anti-lock Braking System) module for any faults.
5
Verify that the tires are of equal size and properly inflated, as mismatched tires can trigger the traction control system.
6
Test the vehicle's battery voltage and condition, as low voltage can affect the traction control system operation.

Solution

1. Preparation

Gather necessary tools and parts.
Park the vehicle on a level surface and engage the parking brake.
Disconnect the negative battery terminal to prevent electrical shock.

2. Address Diagnostic Trouble Codes

Connect the OBD-II scanner and retrieve any stored codes.
Document any relevant codes (e.g., C0035 - Left Front Wheel Speed Sensor).
Clear the codes and test drive the vehicle to see if the light returns.

3. Inspect and Clean Wheel Speed Sensors

Locate the wheel speed sensors on each wheel hub.
Disconnect the sensor wiring harness.
Remove the sensor using a socket set.
Clean the sensor and its mounting surface with brake cleaner.
Reinstall the sensor and reconnect the wiring harness.

4. Check Brake Fluid Level

Open the hood and locate the brake master cylinder.
Inspect the brake fluid level; it should be at the recommended level.
If low, add the appropriate brake fluid (DOT 3 or DOT 4 as specified in the owner's manual).
Close the master cylinder cap securely.

5. Inspect ABS Module

Locate the ABS module, typically found near the brake master cylinder.
Check for any visible damage or loose wiring.
If codes indicate ABS module faults, consider replacing the ABS module following manufacturer instructions.

6. Verify Tire Condition

Inspect all four tires for size, tread depth, and equal inflation.
Inflate all tires to the manufacturer’s recommended pressure.
Replace any mismatched or excessively worn tires.