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How to Clear Toyota Tundra Engine Codes

by Skip Shelton

The Toyota Tundra's engine systems are controlled and monitored by the Engine Control Unit (ECU). The ECU captures engine data and determines if systems are in a warning or failure state. When a system or component is not functioning within tolerance, the ECU will be triggered to display a code when queried. Some codes trigger instrument panel notifications (such as a check engine light or service light). Engine codes are typically stored in the ECU until they are cleared.

Determine and address the cause of the engine code. Codes triggered by part failure or engine system malfunction should be addressed prior to clearing the code.

Clear the Toyota Tundra's engine code with an OBD-II reader. An OBD-II reader that is capable of clearing codes may be used to clear specific or all codes stored by the Engine Control Unit (ECU). Access the OBD-II port beneath the driver's side dash and attach the reader. Turn the unit on; access the codes and clear codes as necessary.

Remove the negative terminal to the vehicle's car battery to remove power to the ECU. Leave the battery disconnected for approximately five minutes and re-attach. The ECU will be clear of codes.


  • Many hand-held performance tuners for the Toyota Tundra (such as DiabloSport, Hypertech or Power Flash) provide OBD-II port code reading and clearing.
  • Clearing the codes prior to emissions or safety testing may result in insufficient engine and emissions data being available at the time of the test. You may need to test again after additional driving time.


  • Clearing the codes by either the OBD-II reader or the removal of a battery terminal connection will only result in a temporary clearing of the code if the underlying cause remains.

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About the Author

Skip Shelton has been writing since 2001, having authored and co-authored numerous articles for "Disclose Journal." He holds a Bachelor in Science in education and a Master of Business Administration with an emphasis in management from Northwest Nazarene University. Shelton also operates a small automotive maintenance and part-replacement shop.

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Photo Credits

  • Car dashboard image by Andrejs Pidjass from