48V & 12V Lithium Battery Repair & Restoration
Is your vehicle showing a battery warning or won’t start? We restore 12V and 48V lithium batteries safely, reliably, and to OEM standards.
What We Do
• Full diagnostics with dealer tools (ODIS / ISTA / XENTRY, PIWIS)
• Unlocking and restoring batteries after deep discharge or crash
• Cell balancing, calibration & BMS software update
• Coding, adaptation & post-repair testing
Safe. Reliable. Dealer-level quality.
pOPULAR BRANDS
We service lithium battery systems used across the leading German and performance brands — from mild-hybrid 48V platforms to modern 12V lithium starter modules. Our experience covers a full range of premium vehicles, from luxury sedans and high-performance SUVs to GT and supercar models.
Common Faults & Symptoms
Modern 12V and 48V lithium systems are highly sensitive to voltage imbalance, crash events, or long storage periods. When a fault occurs, the vehicle may enter a protection or lockout mode — disabling the starter system, hybrid functions, or even ignition.
- 48V system error or “Battery malfunction” message displayed on the dashboard.
- Engine won’t start or shows “Increased battery discharge” despite a fully charged auxiliary battery.
EQ Boost / ISG / MHEV functions inactive — no hybrid assist or regenerative braking.
- System locked after crash or deep discharge, requiring software-level reactivation.
- Loss of communication with BMS or control module, often caused by voltage drop or isolation fault.
Most “dead” systems can be restored without replacement.
Common faults
VAG GROUP (Audi / Porsche / Bentley / Lamborghini) — 12V & 48V Lithium-Ion Systems
P0A7D00 – 48V battery deep discharge / locked module
P0A8D00 – Battery isolation or insulation fault
P0A8000 – Hybrid battery module inactive / replacement required (BMS)
P0B2900 – Voltage imbalance between lithium cells
P0C9700 – Crash data lock / battery safety isolation active
P136C00 – System inactive after long storage or low voltage condition
P160900 – Internal BMS fault
P056200 – 12V system voltage too low (Li-ion)
P0A9D00 – 12V Li-ion battery performance degradation
U140100 – Communication fault with battery management module (BEM/BMS)
P0AFA00 – 12V Li-ion BMS communication error
BMW — 12V & 48V Lithium-Ion Systems
P0A7D00 – 48V battery deep discharge / locked safety state
P0B2900 – Voltage imbalance between 48V cells
P160900 – Internal BMS fault (48V)
P1B1B00 – Safety relay or contactors locked (48V system)
P0A8000 – 48V hybrid battery module inactive / BMS failure detected
21A02D – 12V Li-ion battery voltage below threshold
21A026 – Communication fault in 12V Li-ion BMS
21A029 – Cell imbalance detected in 12V Li-ion battery
21A030 – Internal BMS fault or incorrect battery registration
Mercedes-Benz — 48V Lithium-Ion (EQ Boost / ISG Systems)
B183384 – 48V system fault (general malfunction)
B18339A – 48V battery malfunction
B183371 – Actuator / contactor stuck or locked
B183349 – Internal electrical fault in 48V battery module
B183319 – 48V battery activation or locking fault
P0A7D00 – 48V battery deep discharge / safety shutdown
P0A8D00 – Battery isolation or insulation fault
P0B2900 – Voltage imbalance between lithium cells
P160900 – Internal BMS error
P1B1B00 – Safety relay lockout or contactor fault
SCHEDULE YOUR APPOINTMENT TODAY
We'll contact you
contacts:
- +44 7593 172563
- 8-9 Lorne Rd, Ramsgate CT11 0AB, UK