On Board Chargers
Diagnose and repair on-board charger faults to restore reliable AC charging, with robust validation and clear reporting.
On-board charger (OBC) failure
The on-board charger (OBC) is responsible for converting AC power from a charge point into DC power to charge the high-voltage battery. When the OBC develops a fault, vehicles often struggle to charge on AC, may display charging or EV system warnings, or may intermittently stop charging.
Our on-board charger repair service focuses on confirming the true failure mode (not just the symptom), repairing or replacing the appropriate components, and validating the charging system under real-world conditions. Where relevant, we also check for related issues that can mimic OBC failure (e.g., charge port issues, wiring faults, HV interlock problems, coolant ingress, or communication faults).
Selection of Covered Vehicles - On-Board Charger Repairs
View a selection of vehicles that have an On-Board Charger repair solution
Audi
- Audi (all plug-ins) 2014-present
- Audi E-Tron 2014-present
Abarth
- Abarth 500e (2023–present)
BMW
- BMW i3 (2013–present)
Citroen
- Citroen Berlingo (2021–present)
- Citroen C4 / C4 X (2020–present)
- Citroen Jumper III (2021–2023)
- Citroen Jumpy III (2020–present)
- Citroen Spacetourer (2020–present)
DS
- DS 3 Crossback (2019–present)
Fiat
- Fiat 500e (2023–present)
- Fiat Doblo (2022–present)
- Fiat Ducato (2020–2023)
- Fiat Scudo (2022–present)
- Fiat Ulysse (2022–present)
Hyundai
- Hyundai Ioniq (2016–2022)
- Hyundai Kona (2018–2023)
Jeep
- Jeep Avenger (2022–present)
Kia
- Kia Niro I (2018–2022)
- Kia Soul II (2014–2018)
- Kia Soul III / e-Soul (2019–present)
Mercedes
- Mercedes B-Class (2014–2017)
Nissan
- Nissan Leaf (2010–present)
- Nissan NV200 / Evalia (2014–present)
- Nissan Townstar (2022–present)
Peugeot
- Peugeot 208 II (2019–present)
- Peugeot 308 III / 308 SW III (2023–present)
- Peugeot 2008 II (2019–present)
- Peugeot Boxer (2021–present)
- Peugeot Expert (2020–present)
- Peugeot Partner (2021–present)
- Peugeot Rifter (2021–present)
- Peugeot Traveller (2020–present)
Renault
- Renault Zoe (2012–present)
Tesla
- Tesla Model S (2012–present)
- Tesla Model X (2015–present)
- Tesla Model Y (2019–present)
- Tesla Model 3 (2017–present)
Toyota
- Toyota RAV 4 III Electric (2012–2014)
Vauxhall
- Vauxhall Astra Mk VIII (2023–present)
- Vauxhall Combo Mk IV (2021–2024)
- Vauxhall Corsa Mk V (2019–present)
- Vauxhall Mokka (2020–present)
- Vauxhall Vivaro C (2023–2024)
Volkswagen
- Volkswagen Crafter (2018–present)
- Volkswagen Golf VII (2014–2021)
- Volkswagen GTE 2014-2020
- Volkswagen Load Up! (2014–2019)
- Volkswagen Up! (2013–present)
Volvo
- Volvo V60 / V60 Cross Country Hybrid (2012–2018)
- Volvo XC90 II Hybrid (2015–2018)
Can't find your vehicle?
The vehicles listed are a selection of On-Board Charger Repairs. Please contact us if your vehicle is not listed.
Call us
Email Us
Case Studies
Browse through our case studies of work we have completed.
Common Symptoms
AC charging will not start
The vehicle refuses to begin charging on AC, often with an error on the car or the charge point.
Charging starts then stops
Charging begins normally but stops after a short time, sometimes repeatedly, suggesting intermittent faults or thermal/protection shutdown.
Reduced AC charge rate
The vehicle charges significantly slower than expected, potentially due to partial phase loss, internal module faults, or derating.
Charging-related warning lights / fault codes
Dash warnings and stored fault codes may indicate charger internal faults, insulation/isolation issues, or communication errors within the charging system.
Vehicles Affected
- EVs and PHEVs with liquid-cooled or integrated OBC assemblies
- Vehicles with combined OBC + DC-DC converter units (architecture-dependent)
- Platforms known for coolant ingress risk into charger housings (vehicle-dependent)
What's Included?
Safety-first assessment and confirmation
We confirm the charging complaint and check for obvious external factors (where applicable) before proceeding with repair decisions.
Root-cause diagnostic approach
We use systematic testing to distinguish OBC faults from upstream issues (charge point, cable, inlet/port, HVIL, wiring, control faults).
Repair / replacement and re-integration
We repair or replace the relevant OBC components/assembly and re-integrate the unit correctly within the vehicle’s HV and communications systems.
Validation and reporting
We validate outcomes (e.g., consistent AC charge acceptance, stability under load, and absence of relevant fault codes) and provide a clear summary of findings and work completed.
All work is backed by a 12-month warranty covering both parts and labour, giving you peace of mind and confidence in the quality of our service.
Very pleased with the service I received. Good communication from Adam throughout the whole process. My car has been repaired for under half the price that BMW were quoting.