How to Resolve Engine Immobilizer Authentication Failure?
2 Answers
Engine immobilizer authentication failure can generally be attributed to the following reasons: 1. The internal chip of the key is not matched/locked (not locked in the immobilizer control unit). 2. Fault in the immobilizer read coil. 3. Communication failure between the immobilizer coil and the immobilizer control unit. 4. Internal fault in the immobilizer control unit and communication failure with the engine control unit. 5. Electromagnetic interference, etc. Solution: Read the fault codes to identify the fault point based on the fault code content, and check the current status of each system by reading the data stream. How the engine immobilizer system works: The car's ignition key contains an electronic chip, each with a fixed ID (equivalent to an identification number). The car can only start when the key chip's ID matches the ID on the engine side. Conversely, if they do not match, the car will immediately cut off the circuit automatically, preventing the engine from starting.
As a young driver who frequently uses my car, I've encountered the issue of engine anti-theft authentication failure several times. Most of the time, it's due to a dead key fob battery or signal interference. Having too many electronic devices in the car, like phone chargers, can disrupt the key signal. Try replacing the key fob battery or removing potential interference sources. If that doesn't work, it might be a fault in the anti-theft system module, requiring professional assistance from a 4S dealership to reset the program with specialized equipment. Never attempt to force it yourself to avoid engine lockout. Regular key protection is crucial – avoid dropping or water exposure to minimize such issues. Safety first: always turn off the engine before troubleshooting any faults.
