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How to Reset a Tundra ECU

by Gregory Crews

When replacing sensors and performing maintenance on a Toyota Tundra, the engine control unit may not turn the indicator light off. Resetting the ECU turns the indicator off and wipes out any codes the ECU may have. This is best done after any repair work to ensure the codes stay gone as they will come back as soon as the ECU reads a faulty code or experiences an engine problem.

Open the hood for access to the engine compartment. Locate the battery on the front of the engine on the battery side.

Unscrew the negative cable on the battery. The negative terminal is indicated by the "-" symbol in front of the post.

Take the cable off the terminal. Leave it off for five to ten minutes.

Tighten the cable back on to the terminal. Tighten with a socket wrench.

Start the truck and ensure the "Service Engine" light is gone.


  • Resetting the codes only wipes the memory of the ECU. If there is an underlying problem, the codes will reappear and should be investigated as soon as possible.

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About the Author

Gregory Crews has been in the film industry for three years and has appeared in more than 38 major motion pictures and 16 television shows. He also writes detailed automotive tutorials. His expertise in the automotive industry has given him the skills to write detailed technical instructional articles.

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