P1667 Land Rover Code - Engine Anti-Theft Signal Circuit Low
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
- P1667 Land Rover indicates Engine Anti-Theft Signal Circuit Low.
- 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 P1667 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) P1667 is set, there is an engine anti-theft signal circuit low voltage caused by a serial link short circuit to ground.
What are the Possible Causes of the DTC P1667 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 P1667 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 P1667 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 P1667 Land Rover Code
1. What are the common symptoms of OBDII code P1667 in a Land Rover?
- Common symptoms include difficulty starting the engine, engine stalling, and the inability to disable the vehicle's anti-theft system.
2. What could cause the Engine Anti-Theft Signal Circuit Low code (P1667) in a Land Rover?
- Possible causes include a faulty anti-theft module, damaged wiring in the anti-theft circuit, or a malfunctioning ignition key.
3. How can I diagnose the cause of OBDII code P1667 in my Land Rover?
- A thorough inspection of the anti-theft system components, checking for damaged wiring, and testing the ignition key can help diagnose the issue.
4. Can I still drive my Land Rover with the P1667 code present?
- It is not recommended to drive the vehicle with the P1667 code active, as it may lead to sudden stalling or starting issues while driving.
5. How can I repair the Engine Anti-Theft Signal Circuit Low code in my Land Rover?
- Repair typically involves fixing or replacing the faulty anti-theft module, repairing damaged wiring, or reprogramming the ignition key.
6. Will resetting the OBDII code P1667 resolve the issue temporarily?
- Resetting the code may temporarily clear the error message, but the underlying issue causing the code needs to be addressed to prevent it from reoccurring.
7. Is it necessary to visit a dealership for repairs related to code P1667 in a Land Rover?
- While a dealership may have specialized knowledge and tools, an experienced mechanic familiar with Land Rovers can also effectively diagnose and repair the issue.
8. Can a low vehicle battery voltage trigger the P1667 code in a Land Rover?
- Yes, a low battery voltage can sometimes trigger this code, as it may disrupt the anti-theft system's proper functioning.
9. Are there any preventive maintenance steps to avoid OBDII code P1667 in a Land Rover?
- Regularly checking the condition of the anti-theft system components and ensuring the battery is in good condition can help prevent this code from appearing.
10. How long does it typically take to repair the Engine Anti-Theft Signal Circuit Low code in a Land Rover?
- The repair time can vary depending on the exact cause of the code, but it may take a few hours to a full day for diagnosis and repair.
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