Hybrid 12V Not Charging / DC-DC Converter Fault – London Mobile Service
Call / Text: 07421 186356 – We come to your location.
If your hybrid is showing low 12V battery warnings, struggling to power up, or shutting down electrical systems, the DC-DC converter may not be charging the 12V system correctly. Hybrids don’t use an alternator – the DC-DC converter charges the 12V from the high-voltage battery.
Standard Diagnostic Call-Out: £95 – Full charging system testing included.
Common Symptoms
- Hybrid won’t start / won’t go into Ready mode
- 12V battery repeatedly going flat
- Warning lights flickering or systems shutting off
- Electrical accessories behaving erratically
- No charging voltage at 12V battery while in Ready
What We Check On-Site
- DC-DC converter output voltage and load capability
- 12V battery condition & internal resistance
- High-voltage system safety interlocks
- Hybrid ECU & charging control data
- Grounds, wiring and charging fuses/relays
Possible Repairs (Same-Day Where Possible)
- 12V battery replacement
- DC-DC converter testing & replacement options
- Charging fuse / wiring / ground repairs
- Hybrid system resets after repair
Service Area – London
We cover all London boroughs. No towing required. We come to you.
Call to Book
Call / Text: 07421 186356
Same-day hybrid charging system diagnostics & repair available.