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P1805 Hyundai Code - Immobilizer EEPROM Error

Quick Answer

The P1805 Hyundai code indicates an Immobilizer EEPROM error, which refers to a problem with the electronic control module (ECM) that communicates with the vehicle's immobilizer system. Common causes include Faulty immobilizer key or key fob, Wiring issues in the immobilizer system, ECM malfunction. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1805 Hyundai indicates Immobilizer EEPROM Error.
Common causes
Common causes include Faulty immobilizer key or key fob, Wiring issues in the immobilizer system, ECM malfunction.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P1805 Hyundai Description

The P1805 Hyundai code indicates an Immobilizer EEPROM error, which refers to a problem with the electronic control module (ECM) that communicates with the vehicle's immobilizer system. The immobilizer system is designed to prevent unauthorized access to the vehicle by requiring a valid key or key fob to start the engine. When this code is triggered, it means that there is an issue with the EEPROM (Electrically Erasable Programmable Read-Only Memory) within the immobilizer system, potentially leading to difficulties starting the vehicle or even preventing it from starting altogether.

OBDII Code P1805 Hyundai - Immobilizer EEPROM Error
P1805 Hyundai Code - Immobilizer EEPROM Error

Common Causes of P1805 Hyundai

  1. Faulty immobilizer key or key fob
  2. Wiring issues in the immobilizer system
  3. ECM malfunction
  4. Low battery voltage affecting the immobilizer system
  5. Faulty immobilizer control module

Symptoms of P1805 Hyundai

  1. Engine cranks but does not start
  2. Immobilizer system warning light illuminated on the dashboard
  3. Vehicle stalls shortly after starting
  4. Inability to start the engine with a valid key or key fob

How to Fix P1805 Hyundai

  1. Check and replace the immobilizer key or key fob if necessary
  2. Inspect and repair any damaged wiring in the immobilizer system
  3. Test and potentially replace the ECM
  4. Check and recharge or replace the battery if voltage is low
  5. Replace the immobilizer control module if found to be faulty

Cost to Fix P1805 Hyundai

The typical repair costs for addressing an immobilizer EEPROM error can range from $200 to $600, including parts and labor. However, it is important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops may charge less. It is recommended to inquire about local rates to get a more accurate estimate for this repair.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1805 Hyundai Code

1. What are the common symptoms of OBDII code P1805 Hyundai (Immobilizer EEPROM Error)?

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

2. What causes the OBDII code P1805 Hyundai (Immobilizer EEPROM Error)?

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.

3. How can I diagnose the OBDII code P1805 Hyundai (Immobilizer EEPROM Error)?

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.

4. Can I still drive my vehicle with the OBDII code P1805 Hyundai (Immobilizer EEPROM Error)?

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.

5. How can I repair the OBDII code P1805 Hyundai (Immobilizer EEPROM Error)?

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

6. Are there any DIY fixes for the OBDII code P1805 Hyundai (Immobilizer EEPROM Error)?

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.

7. How much does it cost to repair the OBDII code P1805 Hyundai (Immobilizer EEPROM Error)?

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.

8. Will resetting the OBDII code P1805 Hyundai (Immobilizer EEPROM Error) make it go away permanently?

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.

9. Can a dead car battery cause the OBDII code P1805 Hyundai (Immobilizer EEPROM Error)?

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.

10. Is the OBDII code P1805 Hyundai (Immobilizer EEPROM Error) a common issue in Hyundai vehicles?

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

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