Top 5 Symptoms of a Failing Range Rover Sport BECM

Is Your Range Rover Sport PHEV Acting Up? 5 Symptoms of a Failing BECM

The Battery Energy Control Module (BECM) is a known failure point on some Range Rover Sport PHEV models (like the P400e and P440e). If you are experiencing strange and severe electrical issues, a faulty BECM is a likely culprit. Here are the top five symptoms.

1. ‘Hybrid System Fault' Warning Message

This is the most common and direct indication. A red or yellow warning message appearing on the instrument cluster stating there is a fault with the hybrid system often originates from the BECM detecting an internal error or a problem it cannot manage.

2. Vehicle Refuses to Charge

You plug in your charge cable, the light may flash, but charging never begins, or it starts and then stops after a few minutes. Since the BECM controls the entire charging process, its failure will prevent the HV battery from being charged.

3. Vehicle Will Not Start or Enter ‘Ready' Mode

A failed BECM can prevent the high-voltage system from activating safely. Without the HV system online, the vehicle cannot enter the ‘Ready' state to drive, effectively leaving you stranded, even if the 12V battery is fully charged.

4. Red Battery Warning Light

A red battery warning light on a hybrid doesn't just refer to the 12V battery. It can indicate a critical fault within the high-voltage battery system, which is monitored and controlled by the BECM.

5. Drastically Reduced or Zero Electric Range

Even if the vehicle runs on the gasoline engine, a failed BECM will prevent the use of the electric motor. You will have zero EV range, and the car will operate only as a conventional internal combustion vehicle, with significantly reduced performance and efficiency.

If you're seeing these symptoms, a professional diagnosis is required. A faulty BECM will store codes (like P0A1F) that a technician can read. The solution is always a replacement with a new, genuine unit.