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What is the reason why the Toyota P2109 trouble code cannot be deleted?

2 Answers

Fred

07/24/25 12:34am

Toyota P2109 trouble code cannot be deleted possibly because the fault has not been resolved or there might be an issue with the vehicle's system. Below are detailed explanations and solutions: Fault Not Resolved: Automotive trouble codes are codes generated by the vehicle's computer ECU after analyzing faults. Common trouble codes are often caused by sensor malfunctions or poor sensor performance. Trouble code P2109 indicates an incorrect closed position of the throttle valve opening angle sensor. You can observe after repairing it. Vehicle System Issue: The vehicle navigation system mainly consists of a host, display screen, operation keyboard (remote control), and antenna. It enables digital intelligent navigation for field surveys and travel. If there is an issue with the vehicle system, you can try upgrading the system to resolve it.

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WalkerLynn

08/10/25 8:19pm

As a veteran driver with over 20 years of experience, I've encountered many stubborn trouble codes like P2109. This primarily indicates an issue with the throttle actuator circuit, which could be caused by a stuck motor, damaged sensor, or poor wiring contact. The reason it can't be cleared is usually because the problem hasn't been fully fixed - the system immediately detects and reports the fault after clearing; or it might be an intermittent fault that only triggers during high temperatures or uphill driving; there could also be a short circuit in the power line or an ECU memory fault requiring a refresh. I remember once trying to replace the entire throttle body myself, but the code persisted - it turned out to be caused by worn wiring harness grounding. This kind of fault can lead to weak acceleration, increased fuel consumption, and even stalling in severe cases. I recommend not delaying and taking it directly to a professional repair shop for a comprehensive circuit and ECU check with diagnostic equipment. Regular maintenance should include cleaning throttle body carbon buildup to reduce such risks.

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