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Engine-Codes – Land Rover – P1674 Land Rover

P1674 Land Rover Code - Engine Anti-Theft Signal

Quick Answer

The P1674 code for Land Rover vehicles specifically refers to a problem with the Engine Anti-Theft Signal. Common causes include Faulty key or immobilizer system, Wiring issues between the ECM and immobilizer, Faulty ECM. 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
P1674 Land Rover indicates Engine Anti-Theft Signal.
Common causes
Common causes include Faulty key or immobilizer system, Wiring issues between the ECM and immobilizer, Faulty ECM.
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 08, 2024
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Code P1674 Land Rover Description

The P1674 code for Land Rover vehicles specifically refers to a problem with the Engine Anti-Theft Signal. This means that there is a communication issue between the engine control module (ECM) and the vehicle's immobilizer system. The immobilizer system is designed to prevent the engine from starting without the correct key, which helps to deter theft. When this code is triggered, it typically indicates that the ECM is not receiving the proper signal from the immobilizer system, leading to a security concern.

OBDII Code P1674 Land Rover - Engine Anti-Theft Signal
P1674 Land Rover Code - Engine Anti-Theft Signal

Common Causes of P1674 Land Rover

  1. Faulty key or immobilizer system
  2. Wiring issues between the ECM and immobilizer
  3. Faulty ECM
  4. Battery voltage issues
  5. Aftermarket modifications interfering with the immobilizer system

Symptoms of P1674 Land Rover

  1. Engine cranks but does not start
  2. Engine starts but immediately stalls
  3. Security light on the dashboard stays illuminated
  4. Loss of power while driving
  5. Inability to program new keys

How to Fix P1674 Land Rover

  1. Check the key and immobilizer system for any damage or malfunctions. Replace if necessary.
  2. Inspect the wiring between the ECM and immobilizer for any loose connections or damage. Repair or replace as needed.
  3. Test the battery voltage to ensure it is within the proper range. Charge or replace the battery if necessary.
  4. Check for any aftermarket modifications that may be interfering with the immobilizer system. Remove or disable as needed.
  5. Clear the code from the ECM and perform a relearn procedure for the anti-theft system to ensure proper communication.

Cost to Fix P1674 Land Rover

The typical repair costs for addressing the P1674 code on a Land Rover can vary depending on the exact cause of the issue. On average, the parts and labor for this repair can range from $200 to $500. However, it is essential to keep in mind 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. It is recommended to check with local shops for a more precise estimate.

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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 P1674 Land Rover Code

1. What are the common symptoms of OBDII code P1674 (Engine Anti-Theft Signal) in a Land Rover?

- Common symptoms include difficulty starting the vehicle, engine stalling, and the inability to engage the ignition system.

2. What causes the OBDII code P1674 in a Land Rover?

- The code is typically triggered by issues with the engine anti-theft system, such as a faulty immobilizer module or a disrupted signal between the key and the vehicle's computer.

3. How can I diagnose the OBDII code P1674 in my Land Rover?

- Diagnosing this code requires a professional OBDII scanner to read the fault codes stored in the vehicle's computer system. It is recommended to seek assistance from a qualified mechanic for an accurate diagnosis.

4. Can I still drive my Land Rover with the OBDII code P1674 present?

- It is not advisable to drive your vehicle with this code present, as it can lead to potential security issues or engine performance problems. It is best to address the issue promptly.

5. Is it possible to reset the OBDII code P1674 in a Land Rover?

- Resetting the code may temporarily clear the error, but it is crucial to identify and address the underlying issue causing the code to prevent it from recurring.

6. Are there any DIY repair tips for fixing the OBDII code P1674 in a Land Rover?

- DIY repairs for this code are not recommended due to the complexity of the anti-theft system. It is best to consult a professional mechanic with experience in diagnosing and repairing such issues.

7. How much does it cost to repair the OBDII code P1674 in a Land Rover?

- The cost of repair can vary depending on the specific cause of the code and the extent of the repairs needed. It is recommended to obtain a diagnosis from a mechanic to determine the exact cost.

8. Can a low battery trigger the OBDII code P1674 in a Land Rover?

- A low battery can potentially cause issues with the anti-theft system, leading to the triggering of the code. It is advisable to ensure the battery is in good condition as part of the troubleshooting process.

9. Will disconnecting the battery reset the OBDII code P1674 in a Land Rover?

- Disconnecting the battery may reset the code temporarily, but it is important to address the underlying issue causing the code for a lasting solution.

10. How long does it typically take to repair the OBDII code P1674 in a Land Rover?

- The repair time can vary depending on the exact cause of the code and the availability of parts. It is best to consult with a mechanic for an estimate of the repair timeline.

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