Your PHEV has two batteries — and both need attention. PAD checks your 12V auxiliary battery, runs a full OBD diagnostic across every system, and on supported models performs an Aviloo certified high-voltage battery SOH test — the same certificate used by dealers and insurers across Europe.
Most PHEV owners know about one of them. PAD checks both — and on supported models, certifies the one that matters most to resale value.
Every PHEV — like every car — has a standard 12V battery that powers the vehicle's electronics: lights, infotainment, ECU, door locks, and starter systems. This battery is entirely separate from the high-voltage pack and degrades just like any standard car battery.
This is the large lithium-ion battery pack that stores energy for electric driving. Its State of Health (SOH) determines your real-world electric range and is the most important factor in PHEV resale value. Unlike the 12V, degradation is invisible — there's no warning light.
Every PAD PHEV appointment covers the full picture — we don't just plug in and leave.
Professional battery load test measuring voltage, cold cranking amps (CCA), and state of charge. We identify weak or failing 12V batteries before they leave you stranded — a common PHEV problem.
Professional multi-system scan covering engine, hybrid system, ABS, airbag, EPS, gearbox, charging system, and all body control modules. Not just the engine light — every system, every fault code.
On supported PHEV models, PAD measures the high-voltage traction battery's State of Health using Aviloo certified equipment. Official Aviloo certificate issued — the independent proof used by dealers and insurers.
The Aviloo certified HV battery SOH test is available on the models below. Click any brand to see supported PHEV variants, or use the reg/search checker.
Enter your UK reg — we check whether your PHEV's high-voltage battery is covered for an Aviloo certified SOH test. All PHEVs receive the 12V test and full diagnostic regardless.
DVLA lookup — no data stored
Type your PHEV make or model to check HV battery coverage instantly.
PHEV HV battery degradation doesn't trigger a warning light. A car advertised with 30 miles electric range may only deliver 20. Without an SOH test, neither buyer nor seller knows.
PHEVs often use the electric motor rather than the starter motor, so the 12V battery rarely gets properly charged. This leads to surprisingly early 12V failures that can stop the car completely.
A PHEV without battery certification sells for less as buyers factor in unknown degradation risk. An Aviloo certificate supports your asking price — or gives a buyer grounds to negotiate fairly.
Most manufacturer battery warranties require the SOH to stay above a certain threshold (typically 70%). A test before warranty expiry gives you documented evidence if a claim is needed.
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