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When your Toyota Tundra goes into limp mode, it typically means that the onboard computer has detected a significant issue with the engine. This safety feature is designed to safeguard the engine and prevent further damage to other components. A warning indicator, such as the check engine light, will usually illuminate on the dashboard when the vehicle enters limp mode. To diagnose the specific problem, you will need to utilize an OBD II scan tool to retrieve the error code. The only way to exit limp mode is by using this tool to clear the code. However, if the underlying issue is severe, the limp mode will persist until the faulty part is replaced.
To resolve limp mode, you must disconnect the battery. Give me a moment, I need to think about an American phrase for this.
Sounds like a recurring issue with the secondary injection valve. This is the third instance of it causing the vehicle to go into limp mode, limiting speed.
They claim that you can go around the issue as the engine is unable to accelerate when you press the gas pedal, it simply revs up instead.