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Home/Cars/GMC/Sierra/T1XX (2019-Present)/GMC Sierra T1XX (2019-Present) fuel gauge not working, what can I do?

GMC Sierra T1XX (2019-Present) fuel gauge not working, what can I do?

GMC Sierra T1XX (2019-Present)

Error Codes
Severity: highDifficulty: medium2-4 hours
3 min read
472 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 fuel gauge issues in GMC Sierra T1XX (2019-Present). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component
Fuel System
Estimated Time
2-4 hours

Safety Warnings

  • ⚠Disconnect battery before working on electrical systems.
  • ⚠Allow engine to cool before opening fuel system components to avoid fire hazards.

Symptoms

  • •Fuel gauge reading inaccurately (stuck at empty/full)
  • •Check engine light illuminated
  • •Vehicle runs out of fuel unexpectedly
  • •Erratic fuel level fluctuations while driving
  • •Difficulty starting the engine after refueling

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to identify any related issues.
  2. 2Inspect the fuel level sensor and its wiring for any visible damage or disconnection.
  3. 3Check the fuel tank for any signs of contamination or physical damage.
  4. 4Test the fuel level sensor resistance using a multimeter to verify its functionality.
  5. 5Verify the vehicle’s instrument cluster operation by checking other gauge functions.
  6. 6Inspect the fuel pump relay and fuse for proper operation.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Remove Fuel Tank

  • Safely lift the vehicle using a jack and secure it with jack stands.
  • Drain fuel from the tank if necessary.
  • Disconnect the fuel lines and electrical connectors from the fuel tank.
  • Remove the fuel tank mounting straps and lower the tank carefully.

3. Inspect and Replace Fuel Level Sensor

  • Locate the fuel level sensor within the fuel pump assembly inside the tank.
  • Disconnect the sensor from the pump assembly.
  • Use a multimeter to test the sensor for proper resistance; replace if faulty.
  • Install the new fuel level sensor and reconnect it to the pump assembly.

4. Reinstall Fuel Tank

  • Position the fuel tank back into place and secure it with mounting straps.
  • Reconnect the fuel lines and electrical connectors.
  • Refill the fuel tank with gasoline.

5. Reconnect Battery and Test

  • Reconnect the negative battery terminal.
  • Start the engine and verify that the fuel gauge operates correctly.

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
  • •Fuel line disconnect tool
  • •Jack and jack stands

Parts Required

  • •Fuel level sensor
  • •Fuel filter (if necessary)

Additional Information

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

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