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If you're seeing an immobilizer fault code 23 on your Ford Transit Van, don't worry, you're not alone. Unfortunately, it's a common issue with the vehicle and can be confusing. This error code can indicate various problems and is often accompanied by other codes that can provide more specific information. Check the pump ECU as it is a common failure point. Use a digital multimeter to test the wires for power. If you have power to the pump and the relay, you probably need to replace the pump ECU.
This particular issue suggests that the immobilizer requires resetting using a re-initialization process that must be carried out by a qualified technician.