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Why does my 2020 Toyota Highlander have trouble starting intermittently? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/Why does my 2020 Toyota Highlander have trouble starting intermittently?

Why does my 2020 Toyota Highlander have trouble starting intermittently?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
625 words

Problem Statement

Learn how to diagnose and troubleshoot intermittent starting issues in your 2020 Toyota Highlander with step-by-step instructions and required tools.

Affected Component
Starting System

Symptoms

  • •Intermittent Starting
  • •Dashboard Lights
  • •No Crank
  • •Clicking Sound

Diagnostic Steps

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

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

  • •Multimeter
  • •OBD-II Scanner
  • •Jumper Cables
  • •Socket Set
  • •Wrench Set
  • •Screwdrivers
  • •Fuse Puller

Additional Information

Affected Component
Starting System
Difficulty
medium
Severity
medium
Tools Required
7 items

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Back to Generation
Troubleshooting Intermittent Starting Issues in a 2020 Toyota Highlander
Tools Required
  • Multimeter
  • OBD-II Scanner
  • Jumper Cables
  • Socket Set
  • Wrench Set
  • Screwdrivers
  • Fuse Puller
Repair Instructions

Step 1: Battery Inspection and Testing

  1. Turn off all electrical devices (headlights, radio, etc.).
  2. Disconnect the Battery: Remove the negative terminal first, then the positive.
  3. Clean Terminals: Use a wire brush to clean any corrosion from the battery terminals.
  4. Reconnect the Battery: Reconnect the positive terminal first, then the negative.
  5. Test Battery Voltage: Using a multimeter, check the battery voltage. If below 12.4 volts, consider replacing the battery.

Step 2: Inspect and Test Starter Relay and Fuses

  1. Locate the Fuse Box: Consult the owner’s manual for the exact location of the fuse box.
  2. Inspect Fuses: Pull out the starter fuse and check for continuity with a multimeter. Replace if blown.
  3. Test Starter Relay: Swap it with a similar relay if available to see if the issue resolves.

Step 3: Scan for Fault Codes

  1. Connect OBD-II Scanner: Plug the scanner into the OBD-II port under the dashboard.
  2. Read Codes: Record any fault codes and research their meanings.
  3. Clear Codes: After addressing any issues, clear the codes and retest the vehicle.

Step 4: Starter Motor Testing

  1. Locate Starter Motor: Refer to the service manual for the exact location.
  2. Test Voltage at Starter:
    • Connect the multimeter’s positive lead to the starter terminal and ground the negative lead.
    • Have an assistant turn the ignition to the start position.
    • If voltage is present but the starter does not engage, replace the starter motor.
  3. Direct Power Test: If no voltage, use jumper cables to connect the starter directly to the battery to see if it engages.

Step 5: Additional Considerations

  1. Fuel System: If the starter and battery are good, check the fuel system for any clogs or issues.
  2. Ignition System: Inspect the ignition coils and spark plugs for wear or failure.
  3. Security System: Ensure that the vehicle’s immobilizer is not engaged or malfunctioning.
Conclusion

If after following these steps the vehicle still has intermittent starting issues, it may be necessary to consult with a professional technician or visit a Toyota dealership for further diagnostics. Ensure all wiring and connections are intact, as intermittent electrical issues can sometimes be due to damaged wiring or poor connections.