P0A10 fault code: DC/DC Converter Status Circuit High Input

Last updated · OBDCode UK editorial

P0A10 means “DC/DC Converter Status Circuit High Input” — a hybrid propulsion fault in the powertrain. Stop driving now. The DC/DC converter, which typically supplies the 12V system from the high-voltage pack, is reporting a high reading on its status circuit. This is not a 12V-only DIY job. Stop and use an EV-competent workshop.

Can I DIY?

Do not DIY this repair. We do not publish DIY repair or strip-down steps for this code on this page. Read codes and observe only; leave the repair to a qualified garage.

Do not DIY this repairDIY boundary
ToolsSpecialist tools or workshop equipment — typically a professional garage job.

This fault is in the professional-only category. We do not publish strip-down or fitting steps on this page. Use a qualified garage.

P0AxxHybrid propulsion
MOT fail riskif the warning light stays on

What does P0A10 mean?

P0A10 is a generic (SAE standard) powertrain code reported by your car’s engine control unit. It sits in the P0Axx block, which covers hybrid propulsion. The stored description is “DC/DC Converter Status Circuit High Input”. The code itself tells you which circuit or system tripped the fault — not always the exact part that failed.

How to diagnose P0A10 yourself

  1. Confirm P0A10 and DC/DC companion codes: With the vehicle stationary in open air, scan for P0A10. Note current versus pending and whether other DC/DC status or enable codes appear on the same scan. Do not back-probe the converter. Stop if: You would open the converter housing, isolate the traction battery, or work under the car on a jack.
    Generic driver footwell showing a broad OBD-II socket search zone and the usual 16-pin socket shape.
    Park safely and switch off before locating the socket. Its position varies, so use the vehicle handbook and never force or dismantle trim.
  2. Note 12V lamps and battery warnings: From the driver's seat, note dim headlamps, a 12V battery warning, flickering interior lamps, or a no-Ready condition. Do not jump-start across terminals next to orange cables. Stop if: You smell burning, the 12V battery is swollen or leaking, or you plan to disconnect it beside orange cables.
  3. Do not disconnect the 12V battery here: If you can see the 12V battery from above without reaching past orange cables, note only whether it sits beside high-voltage marking. Leave terminals connected. This page does not publish a disconnect order. Stop if: The battery is leaking, swollen, or you would need to put tools near orange cables to reach the terminals.
    Warning notice showing a generic orange high-voltage cable with a lightning warning triangle, a crossed-out hand and a stop sign, above the words do not touch and arrange recovery.
    Keep clear of orange high-voltage cables. Do not touch, probe or inspect them closely; stop and arrange specialist recovery.

Will P0A10 fail an MOT?

An illuminated engine management light is a Major defect at MOT (automatic fail) until the fault is repaired and the light stays off. Electrical equipment that cannot keep required lamps working is also an MOT concern.

Before booking your test, check what usually fails on your car: see our MOT pass rates by make and model, built from 33.1 million DVSA tests.

What the MOT data says

No MOT certificate item corresponds to this code; MOT outcome data cannot be shown.

Related guides

Car diagnostic test cost: compare the scopeUK booking marketplaces currently publish diagnostic averages of about £52–£65. Engine management light on: steady or flashing?A steady engine management light means the computer has stored a fault. Drive with caution and get the code read. A flashing light is different — stop when it is safe.
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P0A10 — quick answers

Is it safe to drive with P0A10?

Stop driving now. Stop driving. A DC/DC converter status-circuit high reading can leave the 12V system unsupported. Arrange recovery. Do not open orange cables or the traction battery.

Can I fix P0A10 myself?

Do not DIY this repair. We do not publish DIY repair or strip-down steps for this code on this page. Read codes and observe only; leave the repair to a qualified garage. Specialist tools or workshop equipment — typically a professional garage job.

Will P0A10 fail my MOT?

An illuminated engine management light is a Major defect at MOT (automatic fail) until the fault is repaired and the light stays off. Electrical equipment that cannot keep required lamps working is also an MOT concern.

Fault-code identifiers are standard diagnostic facts. Their explanations and diagnostic guidance on this site are original editorial summaries, not reproduced SAE wording. MOT defect rules reflect the DVSA MOT inspection manual (2026). This page is general guidance for UK drivers, not a substitute for a professional diagnosis.