Genuine Land Rover MHEV 48V to 12V DC-DC Converter

Fix “Charging System Fault” on Your MHEV Land Rover

Is your Mild Hybrid (MHEV) Land Rover displaying the “Charging System Fault” warning? Are you dealing with a 12V battery that repeatedly dies, even after replacement? The most common cause is a failed 48V to 12V DC-DC Converter.

This vital component acts as the alternator in your MHEV system, converting power from the 48V hybrid battery to charge the main 12V battery and run the vehicle's electronics. When it fails, the 12V battery is no longer charged, leading to a rapid loss of power and eventual shutdown.

Common Failure Symptoms This Part Solves:

• “Charging System Fault” warning message
• Red battery light on the instrument cluster
• 12V battery constantly needing a jump start or dying
• Widespread electrical issues (dimming lights, infotainment glitches)
• Auto Start/Stop system is unavailable

Product Details:

• Part Name: DC-DC Converter / Generator Control Module (GCM)
• Function: Charges the 12V battery in MHEV systems
• Condition: New, Genuine JLR OEM
• Compatibility: Fits various Land Rover models with MHEV (Mild Hybrid) engines, including the Defender, Discovery, and Range Rover. Part numbers vary by model; please confirm the correct part for your VIN before ordering. Common part numbers include LR176473 and T4A37286.

Professional Installation Recommended. This part is a component of the 48V system. While not as high-voltage as a PHEV/EV, specific safety procedures should be followed during installation. After installation, clearing all diagnostic trouble codes (DTCs) with a compatible tool is required. To renew the DCDC you can use the SPC5 chip programmer.