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how to fix the EPS warning light on GMC Sierra T1XX (2019-Present) - GMC Sierra
Home/Cars/GMC/Sierra/T1XX (2019-Present)/how to fix the EPS warning light on GMC Sierra T1XX (2019-Present)

how to fix the EPS warning light on GMC Sierra T1XX (2019-Present)

GMC Sierra T1XX (2019-Present)

Error Codes
2-4 hours
Time
medium
Difficulty
high
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
3 min read
571 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix the EPS warning light on GMC Sierra T1XX (2019-Present). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component
Steering
Estimated Time
2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

  • •Disconnect the battery before working on electrical systems.
  • •Allow the engine to cool before opening any components.

Symptoms

  • •EPS warning light illuminated on the dashboard
  • •Difficulty steering the vehicle, especially at low speeds
  • •Unusual noises coming from the steering column
  • •Steering wheel feels heavier than normal
  • •Intermittent loss of power steering assist

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6

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
  • •Fluid pump
  • •Screwdriver set
  • •Socket set
  • •Torque wrench

Parts Required

  • •Power steering fluid
  • •Power steering motor (if needed)
  • •Power steering control module (if needed)
  • •Electrical cleaner

Additional Information

Affected Component
Steering
Estimated Time
2-4 hours
Difficulty
medium
Severity
high
Tools Required
6 items
Parts Required
4 items

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Solution
1. Preparation
  • Gather necessary tools and parts.
  • Ensure the vehicle is parked on a level surface, and the engine is off.
  • Disconnect the negative battery terminal to prevent electrical shorts.
2. Check and Replace Power Steering Fluid
  • Tools Required: Fluid pump, funnel, rags
  • Inspect the power steering fluid reservoir.
  • If low, remove the cap and use a fluid pump to add the correct type of power steering fluid (check owner’s manual for specifications).
  • Clean any spills with rags and replace the cap.
3. Inspect Electrical Connections
  • Tools Required: Screwdriver set, dielectric grease
  • Locate the power steering control module and power steering motor.
  • Disconnect the wiring harnesses and inspect for corrosion or damage.
  • Clean connections with electrical cleaner and apply dielectric grease before reconnecting.
4. Test Power Steering Motor
  • Tools Required: Multimeter
  • Connect the multimeter to the power steering motor’s terminals.
  • Check for proper voltage as specified in the service manual while turning the steering wheel.
  • If voltage is insufficient, consider replacing the power steering motor.
5. Replace Power Steering Control Module (if necessary)
  • Tools Required: Socket set, torque wrench
  • If diagnostics indicate a faulty control module, remove the old module by unscrewing it from its mount.
  • Install the new module, ensuring all connections are secure.
  • Torque bolts to the manufacturer’s specifications.
6. Reconnect Battery and Test
  • Reconnect the negative battery terminal.
  • Start the vehicle and check if the EPS light is still illuminated.
  • Test steering functionality to ensure assist is restored.