Engine Anti-Theft Signal Circuit Low
Table of contents
P1667 LAND-ROVER Possible Causes
- Faulty Body Control Unit (BCU)
- Body Control Unit harness is open or shorted
- Body Control Unit circuit poor electrical connection
How do I fix code P1667 LAND-ROVER?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P1667 LAND-ROVER code
The cost of diagnosing the P1667 LAND-ROVER code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1667 LAND-ROVER Description
The Body Control Unit (BCU) uses the driver’s door key lock and unlock switches to activate and deactivate the security system. The driver’s door lock is also used for entering the EKA.
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.
