why does my Cadillac Escalade T1XX (2021-Present) fuel gauge not working

Symptoms

• Fuel gauge shows empty despite a full tank
• Erratic fuel gauge readings
• Check engine light illuminated
• Warning message on the dashboard
• Difficulty starting the engine due to incorrect fuel reading

Diagnostic Steps

1. Scan for error codes using an OBD-II scanner to check for related diagnostic trouble codes (DTCs).
2. Inspect the fuel level sensor located in the fuel tank for any visible damage or disconnection.
3. Check the wiring harness and connectors leading to the fuel gauge for corrosion or loose connections.
4. Test the fuel level sending unit with a multimeter to ensure it’s functioning correctly.
5. Verify the instrument cluster operation by performing a gauge sweep test if available.
6. Inspect the vehicle’s battery and ground connections for any issues that could affect electrical readings.

Solution

1. Preparation

• Gather tools and parts needed.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery to prevent electrical shock.

2. Access Fuel Level Sensor

• Remove the rear seat or any covering to access the fuel tank if necessary.
• Disconnect the fuel tank wiring harness and remove the fuel pump assembly from the tank.
• Tools Required: Socket set, screwdrivers, safety gloves.

3. Inspect and Test Fuel Level Sending Unit

• Remove the fuel level sending unit from the pump assembly.
• Use a multimeter to measure resistance across the terminals of the sending unit while moving the float arm through its range.
  • Resistance should vary smoothly from empty to full.
• If it does not, replace the sending unit.
• Tools Required: Multimeter, replacement sending unit if necessary.

4. Reassemble Components

• Reinstall the fuel level sending unit and ensure it is secured properly.
• Reconnect the fuel pump assembly and wiring harness.
• Reinstall any covers or rear seats that were removed.
• Reconnect the battery.

5. Final Check

• Start the vehicle and observe the fuel gauge for correct operation.
• Test drive the vehicle to ensure the gauge reflects correct fuel levels.