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What should I do if my 2021 Toyota Highlander won't start? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/What should I do if my 2021 Toyota Highlander won't start?

What should I do if my 2021 Toyota Highlander won't start?

Toyota Highlander Fourth Generation (2020-present)

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

Problem Statement

Learn how to diagnose and fix starting issues with your 2021 Toyota Highlander. Step-by-step guide covering battery, starter, fuel system, and ignition system checks.

Affected Component
battery, starter, fuel system, ignition system

Symptoms

  • •No response when turning the key or pressing the start button.
  • •Clicking sound when trying to start the engine.
  • •Dashboard lights come on but the engine does not crank.
  • •Engine cranks but does not start.
  • •Warning lights or messages on the dashboard.

Diagnostic Steps

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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
  • •Battery tester
  • •Jump starter or jumper cables
  • •OBD-II scanner
  • •Basic hand tools (screwdrivers, wrenches)
  • •Tire iron (if needed for accessing the battery)

Additional Information

Affected Component
battery, starter, fuel system, ignition system
Difficulty
medium
Severity
medium
Tools Required
6 items

Related Faults

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Back to Generation

If your 2021 Toyota Highlander won't start, it can be a frustrating experience. The issue could stem from a variety of sources, including battery problems, fuel system issues, or starter malfunctions. Below is a detailed, step-by-step guide to diagnose and potentially resolve the issue.

Tools Required
  • Multimeter
  • Battery tester
  • Jump starter or jumper cables
  • OBD-II scanner
  • Basic hand tools (screwdrivers, wrenches)
  • Tire iron (if needed for accessing the battery)
Repair Instructions
  • Battery Replacement: If the battery is found to be weak or faulty, replace it with a new one.
  • Starter Replacement: If the starter is defective, remove the old starter by disconnecting the battery, removing the starter bolts, and wiring, then install the new starter in reverse order.
  • Fuel Pump Replacement: If the fuel pump is not functioning, replace it by removing the fuel tank (if applicable) or accessing it via the rear seat (if your Highlander has a service access panel).
  • Ignition Coil Replacement: If ignition coils are faulty, remove the necessary components to access them, then replace the faulty coils with new ones.
Conclusion

After performing these diagnostic checks and necessary repairs, attempt to start your Toyota Highlander again. If the vehicle still does not start, it may require a professional assessment to diagnose deeper issues such as problems with the vehicle's ECM (engine control module) or other complex electrical systems.