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Symptom

Reduced electric-only range

The car covers noticeably less distance on electric power than it used to — the engine joins in sooner, electric mode gives up earlier, or a plug-in's indicated range has visibly shrunk. Some loss with age and cold weather is normal for every battery; a sharp or accelerating loss is the traction battery or its management asking for attention, and it is often the earliest symptom the driver can actually feel.

Also described as: less ev range, ev range dropped, shorter electric range, battery range loss, reduced ev mode, electric range shrinking, range loss, برد برقی کم شد, شارژ زودتر تمام میشود, menos autonomia electrica, autonomia electrica reducida, bateria dura menos, modo electrico dura poco, المدى الكهربائي أقل, البطارية تخلص بسرعة, مسافة الشحن قلت

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Some causes mean you should stop driving

24 of the 575 codes that produce this symptom indicate a fault where continuing to drive risks damage or is unsafe. If the symptom is sudden or severe, treat it as one of those until a scan says otherwise.

What this usually means

Separate ordinary loss from a fault before diagnosing anything, because most of this complaint is neither a failure nor imaginary. Every traction battery loses a little capacity with age and cycles, and cold weather removes far more than ageing does — a cold pack has higher internal resistance, chemical processes run slower, and the car spends energy heating the cabin and often the pack itself. A winter range figure compared against a summer one is not a measurement of degradation.

What is worth attention is a sharp or accelerating loss, and the reason it matters is that this is often the earliest symptom a driver can actually feel — well before any warning light.

The pack's usable window is defined by its weakest cell group, and that is the mechanism behind most real losses. The management must protect the lowest cell on discharge and the highest on charge, so range is constrained to the worst group rather than to the average. Two packs with identical overall health can behave completely differently if one has drifted apart internally, which is why cell voltage spread is a more useful measurement than a single state-of-health percentage.

The published thresholds give a workable scale. A healthy pack holds its cells within roughly 10 to 20 mV of one another; spread beyond about 30 mV under load is an early sign; 50 to 100 mV in normal operation is meaningful imbalance. Japanese workshop practice reads per-block voltages and the difference between the minimum and maximum at a known state of charge, which is the same measurement expressed as a procedure.

And check the ordinary things first, because they are large: tyre pressures, a roof box, heavy loads, and a climate system set to heat a cold cabin from cold every morning.

Working through it

  • Range fell with the first cold weather and is otherwise steady

    Likely cause
    Normal cold-weather behaviour — higher internal resistance, slower chemistry, and energy spent on heating
    How to confirm it
    Compare against the same route last winter rather than against summer. A seasonal pattern that recovers in spring is not degradation.
    What fixes it
    No repair. Preconditioning while still plugged in recovers a useful part of it, since the heating then comes from the supply.

  • Gradual loss over years, matching mileage and age

    Likely cause
    Ordinary capacity fade — expected, and usually within the manufacturer's warranty threshold
    How to confirm it
    Read state of health and compare against the vehicle's age and mileage. Note the warranty threshold, which is a stated number rather than a judgement.
    What fixes it
    No repair. Record the figure so any later acceleration can be measured against it rather than remembered.

  • Sharp loss over weeks or months

    Likely cause
    Cell group imbalance or a failing module — the weakest group defines the whole pack's usable window
    How to confirm it
    Read per-cell or per-block voltages and the spread between minimum and maximum at a known state of charge. Beyond roughly 30 mV under load is early; 50 to 100 mV is meaningful.
    What fixes it
    Module-level diagnosis by a qualified technician. An outlier group is not the same as a failed pack, which is why the reading matters.

  • Range good but the engine now starts far sooner on a hybrid

    Likely cause
    The usable window has narrowed, so the pack reaches its limits quickly in both directions
    How to confirm it
    Watch the charge display: a gauge that swings rapidly between its ends is the same finding seen from the dashboard.
    What fixes it
    Battery health check. This has its own entry in this vocabulary and is the more visible version of the same fault.

  • Loss coincided with a change in use or load

    Likely cause
    Not the battery — tyres, a roof box, heavier loads, or more motorway driving at higher speed
    How to confirm it
    Check pressures cold against the placard and account for what has changed. Aerodynamic load rises steeply with speed.
    What fixes it
    Correct the pressures, remove the rack. These are larger effects than most people credit and they cost nothing to test.

  • Pack has spent long periods very hot or at very high charge

    Likely cause
    Accelerated ageing — side reactions run faster above roughly 35 °C, and a pack held near full ages faster
    How to confirm it
    Establish the charging and parking habits rather than only reading the current figure. History explains a rate of loss that a snapshot cannot.
    What fixes it
    Change the habit: charge to a lower daily limit and avoid leaving it full and hot. The loss already taken does not come back.

Codes that produce this symptom (575)

Listed with the codes that most typically present this way first — the likeliest place to start.

Information, not instruction

CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.

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.

Others with this symptom

Be the first to write this up

Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.

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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