P1674 Land Rover Code - Engine Anti-Theft Signal
Quick Answer
The Body Control Unit (BCU) uses the driver's door key lock and unlock switches to activate and deactivate the security system. Common causes include Faulty Body Control Unit (BCU), Body Control Unit harness is open or shorted, Body Control Unit circuit poor electrical connection. 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 Body Control Unit (BCU), Body Control Unit harness is open or shorted, Body Control Unit circuit poor electrical connection.
- 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.
Code P1674 Land Rover Description
For immobilization, the BCU disables the starter motor relay. When the engine is cranking, the Engine Control Module (ECM) looks for a coded signal from the BCU. If the signal is not received within one second of cranking, the fuel supply to the engine is stopped and the injectors are disabled. This also prevents unburnt fuel from entering the catalyst.
If the BCU is disconnected, the engine starter motor will remain isolated by the starter motor relay and the ECM will remain immobilized. The main wiring for the system is contained within the main harness, which is relatively inaccessible, so preventing intruders from disabling the system by cutting the wires for the immobilization system. Once the immobilizer has been activated, the destruction of the trigger device or the wiring to it will not disarm the system.
The RF transmitter communicates to the BCU via the RF receiver using a 70 bit code. Pressing the unlock button on the transmitter will re-mobilize the vehicle. The RF transponder is integrated into the metal key assembly, inserting the key into the ignition switch will induce a signal in the exciter coil to re-mobilize the vehicle.
If Diagnostic Trouble Code (DTC) P1674 is set, there is an engine anti-theft signal NO CODE ECM, after a valid code has been received from BCU.
What are the Possible Causes of the DTC P1674 Land Rover?
- Faulty Body Control Unit (BCU)
- Body Control Unit harness is open or shorted
- Body Control Unit circuit poor electrical connection
How to Fix the DTC P1674 Land Rover?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1674 Land Rover code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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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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