Engine Will Not Start: Troubleshooting Steps

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6th Gen 4Runner Won't Start - What to check and What To Consider First

(Reference: 2025 Owner’s Manual, pg. 604)
Link to Owners Manual: https://trail4runner.com/wp-content/uploads/2025/03/2025-4runner-owners-manual.pdf

If your 4Runner won't start even when following the proper procedures, use these quick checks to help narrow down the issue.

Common Causes​

• Out of Fuel – Make sure the tank isn’t empty
• Flooded Engine – Try again using correct startup steps (pg. 218)
• Immobilizer Issue – May require dealer assistance (pg. 70)
• Dead Battery – See Jump Starting section (pg. 608)
• Loose Battery Terminals – Inspect and tighten (pg. 535)
• Blown Fuse or Weak Key Battery – Can disrupt ignition system
• Disconnected Battery – Reconnect and attempt to start again

Temporary Emergency Starting Procedure​

If nothing else works, Toyota allows a one-time emergency start method:

1. Set the parking brake
2. Shift to “P”
3. Turn engine switch to ACC
4. Press and hold the engine switch for ~15 seconds while holding the brake pedal

If the vehicle starts using this method, it may indicate a deeper issue—get it checked at your dealer as soon as possible.

2025 4Runner Engine Will Not Start Troubleshooting Diagram​

See page 604/605 for the flowchart and emergency restart procedure.