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BYD2023–2025 Major issues documented

BYD Seal: common faults & what to check

Thinking about buying a used BYD Seal (2023–2025) in New Zealand? We've documented 6 known faults for this model spanning transmission, body & rust, electrical, and tyres. Each researched and verified before it's published. The most serious issues here are rated major. Every one is listed below with its symptoms and repair cost, and each has its own page with where to look and what to ask the seller. Free, no account needed.

Check this exact BYD Seal

  • Odometer history
  • Money owing
  • Reported stolen
  • Ownership history
  • Official NZ vehicle register data
  • NZ owned and operated

Type the plate for the free basics. The full record is a paid check from $13.49, one car at a time, no subscription.

No NZ plate yet, or buying in Australia? Pick the generation and engine and start a free check below. New to KickTyres? How the check works →

6

Documented faults

Major

Most serious

$250–$1,800

Typical repair

9

Service milestones

Which BYD Seal are you looking at?

2 generation variants documented. Pick the shape you recognise: the faults, the servicing and the timeline below all narrow to it. Free, no account needed.

Now narrow it to the engine

A 1.8 and a 2.4 of the same car do not fail the same way, so the faults below narrow to the engine as well as the year. Free, no account needed.

Which engine is in it? These cover every year of this model.

EV 61.4kWh· electricEV 82.5kWh· electric

Start your free check on this BYD Seal

No plate needed. You get the risk score, the buyer's checklist and the guided inspection for the exact car you picked above — not the whole nameplate.

BYD SealEngine not picked yet

Pick the engine above first: the Seal came with 2, and without it the report has to show all of their faults. Pick the engine

Free. The paid plate check is separate, and stays optional.

Can't confirm for this car

BYD Seal

Nothing has been narrowed yet, so nothing below is a claim about a particular car. Pick a year and an engine to see which faults apply.

Tell us the engine, or check the engine code on the car, before relying on this.

matched on no vehicle context

What to look out for

The checks worth doing on a BYD Seal before you hand over any money. Every documented fault is listed below, each with its own page.

  • Costly issue

    Ask the seller to leave the car locked and untouched overnight, then unlock and power it up yourself first thing.

    See why

    Car goes completely dead / can't be unlocked (12V and BMS software)

    2023-24 Seals are documented becoming completely unresponsive - unable to unlock or start despite the main Blade battery being well charged - typically after the car has sat for a few days or while plugged in at home. The fault traces to the 12V system and how the software tops it up while the car is idle, and BYD addresses it with a BMS/gateway software update through a dealer. There is no formal NZ recall, so an out-of-warranty 12V battery replacement is owner-paid. Combined with BYD's known parts and service delays in Australia and NZ, being stranded by this can mean a long wait for help.

    What you would notice

    • Car totally dead, won't unlock or wake
    • Happens after sitting a few days or while home-charging
    • Needs a jump pack or dealer intervention to recover
    • 12V battery warning messages

    Typically $250–$700 to put right.

  • Costly issue

    On a safe, legal stretch of road, accelerate firmly from low speed and feel for a shudder or vibration through the floor and seat.

    See why

    Shudder / wobble under hard acceleration (rear driveshaft defect)

    2023-25 Seal Premium (RWD) and Performance (AWD) owners report a distinct shudder or wobble under hard acceleration, traced to a manufacturing defect in the rear driveshafts that can be imbalanced or not stiff enough for the electric motor's high torque. The documented fix is replacement of both rear driveshafts. This has been handled as a known defect / warranty repair rather than a formal recall in NZ, so verify it has been done - an unrepaired car will keep shuddering and could wear other driveline parts over time.

    What you would notice

    • Shudder or wobble felt under hard acceleration
    • Vibration that eases at steady cruise
    • Worst from a standing start with heavy throttle

    Typically $1,200–$3,000 to put right.

  • Costly issue

    Inspect charging port rubber gasket for cracking or deformation.

    See why

    Charging Port Housing Seal Deterioration and Water Ingress

    Early-production BYD Seal units had inadequate sealing around the CCS2 charging port housing. The rubber gasket deteriorates prematurely, allowing water ingress into the port cavity after rain exposure. This causes contact corrosion and onboard AC charger faults. BYD AU and NZ dealers have replaced port seals under warranty on affected vehicles, with the issue concentrated in the 2023 production run.

    What you would notice

    • Water visible inside charging port housing after rain
    • AC charging refused or session interrupted
    • Onboard charger fault code in vehicle system
    • Corrosion visible on Type 2 AC charge pins

    Typically $200–$1,800 to put right.

  • Common issue

    Check heat pump refrigerant pressure if accessible via service port.

    See why

    Heat Pump Performance Degradation Below 5°C

    The BYD Seal heat pump loses significant heating efficiency below 5°C, resulting in real-world range drops of 30–40% in NZ South Island and high-altitude winter conditions. This degradation rate is steeper than owner expectations set by WLTP figures and worse than comparable EVs in similar conditions. The battery pre-conditioning system activates frequently in cold weather, further reducing available range. Documented by NZ EV forum members with winter driving data.

    What you would notice

    • Range drops more than 30% in ambient temperatures below 5°C
    • Cabin takes longer than expected to reach set temperature on cold mornings
    • Heat pump compressor running continuously with marginal cabin heating output
    • Battery pre-conditioning activating unprompted and draining charge

    Typically $0–$2,200 to put right.

  • Common issue

    Check tread depth across all four tyres (inner, middle, outer edges) and look for uneven or feathered wear that hints at a poor alignment.

    See why

    Rapid front/rear tyre wear on Performance AWD

    Seal Performance AWD owners report the factory-fitted tyres wearing out quickly - sometimes reaching the wear indicators in as little as 10,000-15,000km - because of the car's heavy kerb weight, instant electric torque and an aggressive factory wheel alignment. Replacement performance-rated tyres for the 19-inch wheels are not cheap, so a car due for tyres is a real cost to factor into the price. Uneven wear can also point to an alignment that was never corrected.

    What you would notice

    • Tyres near the wear bars at low mileage
    • Uneven wear across the tread
    • Road noise increasing as tyres square off

    Typically $1,200–$2,200 to put right.

BYD Seal service schedule

What falls due, and at what distance, for each generation of the BYD Seal. These are the model’s intervals — the car’s own service book is the only thing that can tell you what has actually been done to it.

BYD Seal (BC Series) - Premium · 2022–2026 · 82.5 kWh Battery - RWD Single Motor

Electric

Due by distance

  1. 15,000 km

    First comprehensive health check and software system audit.

  2. 30,000 km

    Recommended interval for cabin air filter replacement and thorough inspection of suspension components.

  3. 60,000 km

    Full fluid flush, specifically focusing on the battery cooling system and brake fluid moisture check.

BYD Seal (BC Series) - Dynamic · 2022–2026 · 61.4 kWh Battery - RWD Single Motor

Electric

Due by distance

  1. 20,000 km

    Initial check of cabin air filter and thorough inspection of the high-voltage cable insulation.

  2. 40,000 km

    Brake fluid flush recommended, plus a deeper inspection of suspension components.

  3. 80,000 km

    Coolant system service for the battery thermal management system becomes a point of consideration.

BYD Seal (BC Series) - Performance AWD · 2022–2026 · 82.5 kWh Battery - Dual Motor AWD

Electric

Due by distance

  1. 20,000 km

    Initial system health check and cabin air filter replacement.

  2. 40,000 km

    Brake fluid flush and detailed inspection of the high-voltage cable insulation.

  3. 80,000 km

    Deep check of the cooling system and suspension components for wear from New Zealand road conditions.

See all 6 documented issuesEverything researched for the BYD Seal.
Depends on which engine this BYD Seal has — 6Each of these is documented for one particular engine. Pick the year and engine above to see which of them apply.
Engine, transmission & cooling1

01Shudder / wobble under hard acceleration (rear driveshaft defect)

On a safe, legal stretch of road, accelerate firmly from low speed and feel for a shudder or vibration through the floor and seat.ev2023–2025Transmission
OccasionalTransmission $1,200–$3,000 to fix

Can't confirm for this car

2023-25 Seal Premium (RWD) and Performance (AWD) owners report a distinct shudder or wobble under hard acceleration, traced to a manufacturing defect in the rear driveshafts that can be imbalanced or not stiff enough for the electric motor's high torque. The documented fix is replacement of both rear driveshafts. This has been handled as a known defect / warranty repair rather than a formal recall in NZ, so verify it has been done - an unrepaired car will keep shuddering and could wear other driveline parts over time.

Symptoms to notice

  • Shudder or wobble felt under hard acceleration
  • Vibration that eases at steady cruise
  • Worst from a standing start with heavy throttle

What to check

On a safe, legal stretch of road, accelerate firmly from low speed and feel for a shudder or vibration through the floor and seat. Ask whether the rear driveshafts have been replaced under warranty and get the invoice. A steady-speed cruise that feels smooth but a shuddery hard launch is the tell.

Where to look: Rear driveshafts / rear drive unit

Ask the seller

  • “Have you ever felt a shudder or wobble under hard acceleration?”
  • “Have the rear driveshafts been replaced under warranty?”
  • “Can you show the repair invoice for that work?”
Electrical3

0112-volt battery sulfation — the car goes completely dead with a full main battery

This is the fault that catches BYD Seal owners out, and it is worth understanding because it looks far worse than it is.ev2023–2024ElectricalRead the full fault: symptoms, where to look, what to ask the seller

02Car goes completely dead / can't be unlocked (12V and BMS software)

Ask the seller to leave the car locked and untouched overnight, then unlock and power it up yourself first thing.ev2023 onwardElectricalRead the full fault: symptoms, where to look, what to ask the seller

03Heat Pump Performance Degradation Below 5°C

Check heat pump refrigerant pressure if accessible via service port.ev2023 onwardElectrical
CommonElectrical $0–$2,200 to fix

Can't confirm for this car

The BYD Seal heat pump loses significant heating efficiency below 5°C, resulting in real-world range drops of 30–40% in NZ South Island and high-altitude winter conditions. This degradation rate is steeper than owner expectations set by WLTP figures and worse than comparable EVs in similar conditions. The battery pre-conditioning system activates frequently in cold weather, further reducing available range. Documented by NZ EV forum members with winter driving data.

Symptoms to notice

  • Range drops more than 30% in ambient temperatures below 5°C
  • Cabin takes longer than expected to reach set temperature on cold mornings
  • Heat pump compressor running continuously with marginal cabin heating output
  • Battery pre-conditioning activating unprompted and draining charge

What to check

  1. Check heat pump refrigerant pressure if accessible via service port.
  2. Review BYD connected app range history across seasons.
  3. Ask about the owner's cold-weather driving experience and typical winter range displayed.

Where to look: Heat pump compressor in engine bay, integrated HVAC module

Ask the seller

  • “What real-world range do you achieve in winter months?”
  • “Has the heat pump or HVAC system been inspected by a BYD dealer?”
  • “Any error codes or warnings related to the heating system?”
Body, brakes, suspension & interior2

01Charging Port Housing Seal Deterioration and Water Ingress

Inspect charging port rubber gasket for cracking or deformation.ev2023–2024Body & Rust
OccasionalBody & Rust $200–$1,800 to fix

Can't confirm for this car

Early-production BYD Seal units had inadequate sealing around the CCS2 charging port housing. The rubber gasket deteriorates prematurely, allowing water ingress into the port cavity after rain exposure. This causes contact corrosion and onboard AC charger faults. BYD AU and NZ dealers have replaced port seals under warranty on affected vehicles, with the issue concentrated in the 2023 production run.

Symptoms to notice

  • Water visible inside charging port housing after rain
  • AC charging refused or session interrupted
  • Onboard charger fault code in vehicle system
  • Corrosion visible on Type 2 AC charge pins

What to check

  1. Inspect charging port rubber gasket for cracking or deformation.
  2. Check inside port housing for moisture or corrosion staining.
  3. Test AC charging after vehicle has been exposed to rain.
  4. Scan for onboard charger fault codes.

Where to look: Rear-right charging port housing and rubber gasket seal

Parts involved: Body corrosion.

Ask the seller

  • “Has the charging port seal been replaced under warranty?”
  • “Any AC charging faults or slow-charging events recorded?”
  • “Has water ever been visible inside the charging port?”

02Rapid front/rear tyre wear on Performance AWD

Check tread depth across all four tyres (inner, middle, outer edges) and look for uneven or feathered wear that hints at a poor alignment.ev2023 onwardTyres
CommonTyres $1,200–$2,200 to fix

Can't confirm for this car

Seal Performance AWD owners report the factory-fitted tyres wearing out quickly - sometimes reaching the wear indicators in as little as 10,000-15,000km - because of the car's heavy kerb weight, instant electric torque and an aggressive factory wheel alignment. Replacement performance-rated tyres for the 19-inch wheels are not cheap, so a car due for tyres is a real cost to factor into the price. Uneven wear can also point to an alignment that was never corrected.

Symptoms to notice

  • Tyres near the wear bars at low mileage
  • Uneven wear across the tread
  • Road noise increasing as tyres square off

What to check

  1. Check tread depth across all four tyres (inner, middle, outer edges) and look for uneven or feathered wear that hints at a poor alignment.
  2. Note the tyre brand and date codes - a set already worn at 15,000-20,000km is normal for this car, so budget for replacements and a wheel alignment.

Where to look: All four tyres, especially fronts on AWD

Ask the seller

  • “How many kilometres did the last set of tyres last?”
  • “Has the wheel alignment been checked or corrected?”
  • “Are these the original tyres, and how much tread is left?”

BYD Seal faults in detail

Each of these has its own page: the symptoms, where to look, what to ask the seller and what the repair costs. Free, no account needed.

12-volt battery sulfation — the car goes completely dead with a full main batteryMajor · ElectricalCar goes completely dead / can't be unlocked (12V and BMS software)Major · Electrical

What these repairs cost on other cars

Some of the BYD Seal’s documented faults are repairs other models share. Each page lists the documented NZ cost for every model it affects.

Other BYD models

BYD Atto 39 documented faultsBYD Yuan Plus5 documented faults

BYD Seal buyer questions

Is the BYD Seal reliable?

Like any used car, it depends on the specific example and its service history. Across the 6 documented faults for the BYD Seal, the recurring problem areas are transmission, body & rust, and electrical. A BYD Seal with a full service history and no signs of the issues listed on this page can be a sound buy but each one needs to be checked individually before you commit.

What are the most common problems with a used BYD Seal?

We've catalogued 6 known faults for the BYD Seal, covering transmission, body & rust, and electrical. All 6 are written out in full on this page, with the symptoms to notice, what to inspect, and typical repair costs for each. Free to read, no account needed.

How much do repairs cost on a BYD Seal?

Most single repairs on the BYD Seal fall between $250–$1,800 at NZ independent-workshop rates. Some of the 6 documented faults cost less and a few cost considerably more, and no one car needs them all. Knowing which ones to look for before you view is what lets you negotiate the price down or walk away.

Should I get a pre-purchase inspection on a BYD Seal?

Yes. A BYD Seal inspection focused on its known weak points is the single best way to avoid an expensive mistake. KickTyres gives you a guided, model-specific inspection plus a market valuation and negotiation figure for $24.90 far less than the cost of missing one of the faults on this page.