B3A0D: Air Conditioning Refrigerant Expansion Valve Actuator Control Circuit High
Single source — subject not independently confirmed
Most codes here are written only once two independent sources agree on what they mean. This one rests on a single source, checked against the codes around it — its family, its block and its neighbours all fit. That makes the subject below likely rather than established, so we have deliberately left out the severity rating, the repair advice and the likely-causes list that a confirmed code carries.
If you have met this code on a real car, what you know is worth more than what we have — please post it below.
What this code means
The expansion valve meters refrigerant into the evaporator — the restriction that drops high-pressure liquid to low pressure, which is what makes the evaporator cold in the first place. Only an electronically actuated valve can set a code; the mechanical kind fitted to most cars has no wiring at all. The corpus documents the confirmed member of this family at B3A11.
Circuit High means the module measured a voltage above the range it expects on this output, which is the signature of a short to a supply, or of a missing ground.
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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