Land Rover Discovery Sport Evoque Range Rover PHEV P300e P400e BECM Replacement Chip TC264 Not Required.

Land Rover Discovery Sport Evoque Range Rover PHEV P300e P400e BECM Replacement Chip TC264  Not Required.

Coming soon  software to make simpler the process of repair these JLR Modules.

L8B2-10C784-BB is the engineering part number for the Battery Energy Control Module (BECM), also known as the High Voltage/Hybrid Battery Management Module.

In newer Jaguar and Land Rover models (specifically those with MHEV or PHEV systems like the New Defender L663 or Discovery 5), this is the "brain" that sits on or near the lithium-ion battery.

Key Details for this Part:

• Service Part Number: If you are trying to order this from a dealer, they will likely cross-reference it to LR137929 or LR181079.
• Function: It monitors the state of charge, cell balancing, and temperature of the hybrid battery system.
• Common Failure: If you are seeing a "Hybrid System Fault" or code P0A1F (BECM Internal Failure), this is usually the part that needs replacing.

Vehicle Compatibility:

This part is most commonly found in 2020+ models, including:

• Land Rover Defender (L663)
• Land Rover Discovery 5 (L462)
• Range Rover Velar
• Jaguar F-Pace / E-Pace

Primary Fault Code: The "Killer" Code

• P0A1F-49: Battery Energy Control Module – Internal Electronic Failure.

  This is the most common code for this part. It means the module has detected a hardware failure on its own internal circuit board. It is almost always "non-clearable" because it represents a permanent hardware fault.
  

Other Common Codes for this Module

If the BECM is failing, you will often see these "secondary" codes as the system tries to figure out why the 48V/PHEV battery is offline:

Important: The "Software-Only" Fix

Before you buy a new module, check if your vehicle is covered under Recall H441 or Service Bulletin N861.

JLR released a software update for many 2020–2024 models because the BECM would sometimes "hallucinate" an internal failure and throw a P0A1F code when the battery was actually fine.

High-Voltage Battery Pack Assemblies (Recall H441/H471) 

Specific high-voltage battery assemblies for the Jaguar I-PACE (Model Years 2019–2024) have been identified in safety recalls due to thermal overload risks. According to NHTSA reports, the following part numbers are involved: 

T4K4282
T4K9818
T4K11674
T4K13288
T4K14489
T4K14609
T4K16281 : Specifically noted as an LG-supplied battery pack in some reports. 

Battery Energy Control Modules (BECM)

The BECM is the most frequent "causal" part for DTC P0A1F-49 (Internal Electronic Failure). Replacement of this module is often the only solution when internal microprocessor failures are detected. 

LR137929 / L8B2-10C784-BB: A critical part number for the BECM in Range Rover and Range Rover Sport PHEV models.
LR165017: The updated BECM part number for the New Range Rover (2022+) and New Range Rover Sport (2023+).
FK72-19H440-AF: A control unit module used in various models like the Jaguar XE and certain Land Rover variants. 

12V and Auxiliary Batteries

Faults such as "SOS Limited Functionality" or vehicle startup failures are often linked to these specific 12V units: 

T4A14084 / T4A14085: 80Ah AGM Stop-Start batteries common in the Jaguar F-Pace and XE.
Exide EK151 : An equivalent auxiliary battery often used in pre-2021 Jaguar I-PACE models. 

Related Repair Services

For out-of-warranty vehicles, specialized repair services are available to address these specific DTCs without full part replacement.