FAULTBASE
Error CodesASKCars
© 2026 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
how to troubleshoot my Toyota Highlander Fourth Generation (2020-present) fuel gauge not working - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/how to troubleshoot my Toyota Highlander Fourth Generation (2020-present) fuel gauge not working

how to troubleshoot my Toyota Highlander Fourth Generation (2020-present) fuel gauge not working

Toyota Highlander Fourth Generation (2020-present)

Error Codes
2-4 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
646 words

Problem Statement

Learn how to troubleshoot and fix the fuel gauge issue in your 2020-present Toyota Highlander. Step-by-step guide with diagnostic and repair instructions.

Affected Component
Fuel System
Estimated Time
2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

  • •Disconnect the battery before working on electrical systems.
  • •Allow the fuel tank to cool before attempting to work on it.

Symptoms

  • •Fuel gauge reading empty despite having fuel in the tank
  • •Fuel gauge fluctuating erratically
  • •Check engine light illuminated
  • •Difficulty starting the engine (if related to fuel delivery)
  • •Fuel warning light not illuminating when low on fuel

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
  • •Socket set
  • •Screwdriver set
  • •Wiring harness repair kit (if needed)

Parts Required

  • •Fuel level sending unit (if faulty)
  • •Fuel pump assembly gasket (if applicable)

Additional Information

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

Related Faults

Loading...

Share this solution

Comments

Sign in to share your thoughts

Sign In

No comments yet

Be the first to share your thoughts

Back to Generation
Solution
1. Preparation
  • Gather tools and parts required for the repair.
  • Ensure the vehicle is parked on a level surface and the engine is off.
  • Disconnect the battery to prevent any electrical shorts during the repair.

Tools Required:

  • OBD-II scanner
  • Multimeter
  • Socket set
  • Screwdriver set
  • Wiring harness repair kit (if needed)
2. Inspect and Replace Fuel Level Sending Unit

  1. Remove the Fuel Tank:

    • Drain the fuel tank to an appropriate level to prevent spills.
    • Disconnect the fuel lines and electrical connectors from the fuel pump assembly.
    • Remove the bolts securing the fuel tank and lower it carefully.

  2. Access the Fuel Level Sending Unit:

    • Locate the fuel pump assembly on top of the fuel tank.
    • Remove the retaining ring securing the fuel pump assembly.
    • Lift the assembly out of the tank to access the sending unit.

  3. Test Sending Unit:

    • Use a multimeter to measure the resistance of the sending unit.
    • If the resistance is outside the manufacturer’s specifications, replace the sending unit.

  4. Replace Sending Unit (if necessary):

    • Install the new sending unit into the fuel pump assembly.
    • Secure the assembly with the retaining ring.

  5. Reinstall Fuel Tank:

    • Position the fuel tank back up into place.
    • Reconnect the fuel lines and electrical connectors.
    • Secure the fuel tank with bolts.
3. Check Instrument Cluster Connection

  1. Remove Instrument Cluster:

    • Use a screwdriver to remove the dashboard trim panel around the instrument cluster.
    • Unscrew and carefully pull out the instrument cluster.

  2. Inspect Connections:

    • Check the connections on the back of the instrument cluster for any loose or damaged wires.
    • Repair or replace any faulty connectors as necessary.

  3. Reinstall Instrument Cluster:

    • Reattach the instrument cluster and dashboard trim panel.
    • Reconnect the battery.