How To Fix It: For amplified transponders, replace the battery. Finally, some keys have battery-amplified transponders, so a dead battery might prevent the codes from being read. Electrical problems, such as broken immobilizer antenna wiring, which usually encircles the ignition cylinder, can prevent the engine immobilizer from reading transponder codes. Code “confusion,” such as having multiple keys can also occur, preventing ignition. An incorrect key code, such as from an unprogrammed key or damaged key, would prevent engine starting.
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If this code matches the ones programmed into the vehicle, engine starting is enabled. The chip in the key transmits a specific code, of which there are millions. Modern cars with immobilizers use transponder keys to enable or disable engine starting or running. If it doesn't recognize the transponder key, it doesn't allow the engine to run. The transponder antenna surrounds the ignition cylinder. How To Fix It: After ensuring the rest of the electrical system is intact, such as fuses, relays, and circuits, replace the ignition switch. On the road, poor ignition switch contacts could shut the engine off while driving, which could be dangerous. Worn ignition switch contacts, temperature problems, or broken springs can all cause the ignition switch to fail, preventing you from starting your car. (These generalizations, depend significantly on year, make, and model.) Generally speaking, in the “OFF” position, the ignition switch doesn’t connect anything in the “ACC” position, the radio or fan may be energized in the “RUN” position, the engine control module is energized and finally, in the “START” position, the starter relay is engaged. Inside the ignition switch, several contacts connect vital electrical systems needed to start and run the car. The ignition switch itself is connected to the ignition cylinder by a shaft or lever. With all the covers removed, it's easy to see how the ignition cylinder relates to the ignition switch and steering wheel lock.
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