P1805 Hyundai Code - Immobilizer EEPROM Error

The common symptoms include difficulty starting the vehicle, engine stalling, and the immobilizer light staying on.

This code is typically caused by a fault in the immobilizer system, such as a malfunctioning immobilizer control module or an issue with the EEPROM.

Diagnosing this code usually involves using a diagnostic scanner to retrieve the specific error code, checking the wiring and connections related to the immobilizer system, and testing the immobilizer control module.

It is not recommended to drive the vehicle with this code active, as it may lead to further issues like engine stalling or complete immobilization.

Repairing this code often involves repairing or replacing the faulty immobilizer control module, reprogramming the immobilizer system, or addressing any wiring issues.

While some simple checks like ensuring all connections are secure can be done DIY, resolving the root cause of this code may require professional diagnostic equipment and expertise.

The cost of repairing this code can vary depending on the extent of the issue, the parts needed, and labor costs. It is advisable to get a few quotes from different mechanics.

Simply clearing the code without addressing the underlying issue will not make it go away permanently. The root cause must be identified and resolved to prevent the code from reoccurring.

A dead or weak car battery can sometimes trigger issues with the immobilizer system, leading to the appearance of this error code. Ensuring the battery is in good condition is a good starting point for troubleshooting.

While not extremely common, the Immobilizer EEPROM Error (P1805) can occur in Hyundai vehicles, particularly in models equipped with sophisticated immobilizer systems.