BYD Blade rear motor (Seal / Sealion 7)
2024–2026 · electric · 313hp
Engine codes: Blade, e-Platform 3.0 Evo
Reliability, common problems and owner reviews for the Byd Sealion 7 BYD Blade rear motor (Seal / Sealion 7). Check this before you buy used.
Seal owners are not reporting dead rear motors. They are reporting a knock. On the German Seal forum a car with 35,000 km clacks from the front of the drivetrain on every load change when regeneration is set to High, and the workshop still had no part to name. Another Seal had both front dampers replaced under warranty at 23,000 km for a dull clack that had been there from delivery; the owner said the knock then went. The same damper story fills a long Seal U thread, so a clack on a test drive is a suspension job until someone proves it is the motor. The 12V on the wider BYD range is a separate, cheaper way to have a car that will not open — Seal U owners were replacing one every few months and were told the 12V warranty is 12 months or 20,000 km. This pass did not find a Sealion 7 motor failure of its own. Buy the car that is quiet over a broken surface and that still unlocks after a weekend.
Same engine, other cars
This is the same physical engine (Blade) sold under different names across brands. Reliability is broadly shared — cross-check these:
Known Issues
A Seal owner at 35,000 km describes a clack on every torque reversal, strongest below about 40 km/h with regeneration on High, felt at the front of the car. The thread is the workshop shrugging. Play in a driveshaft joint, a bush, or the motor mount all make this noise; a software jerk can too. It is not a reason to condemn the Blade pack, and it is a reason not to accept 'all EVs do that' without a road test beside the technician.
Fix / Workaround: Test with regeneration on High: lift off, then pick up, below 40 km/h. If it clacks, book the dealer and keep the recording. Do not buy it on a promise.
Repair cost: €0–€800
Typically appears after: 10,000 km
One Seal had the front dampers changed under warranty at 23,000 km. The clack had been there from the first kilometres and the owner thought the car sat better afterwards. On the Seal U side of the same forum the thread runs for months: dealers hear the knock and call it normal, then other dealers change the dampers. Budget time, not a new motor.
Fix / Workaround: Drive a coarse surface at walking pace and at 30 km/h. A knock that the seller calls 'the tyres' needs a second opinion before money changes hands.
Repair cost: €0–€900
Typically appears after: 5,000 km
This is the same BYD 12V behaviour as the Atto 3, confirmed on the Seal U forum by owners changing the battery every few months. They were told BYD covers the lead-acid 12V for 12 months or 20,000 km, whichever comes first, and that a second battery was not paid because no money had changed hands on the first. Later cars moved to a lithium 12V. A Seal that has already had one flat battery is telling you the cover may already be over.
Fix / Workaround: Ask for the 12V invoice. If the car is past a year, price a quality replacement before you need a tow to open the door.
Repair cost: €150–€250
Typically appears after: 15,000 km
Mileage Thresholds
After 20,000 km: 12V warranty window that Seal U owners were quoted. Listen for the damper knock on the test drive, not at 50,000 km.
After 60,000 km: No pack or rear-motor replacement pattern in the European threads read for this pass.
Pre-Purchase Checklist
- ☐Regeneration on High, lift off and back on below 40 km/h — no clack
- ☐Coarse surface at walking pace — no damper knock the seller blames on the tyres
- ☐Unlocks after a weekend, app included
- ☐12V age and whether it has already been replaced
- ☐One DC charge demonstrated
- ☐Sealion 7: same checks; this pass found no separate motor thread for it
Frequently asked questions
Is the Byd Sealion 7 BYD Blade rear motor (Seal / Sealion 7) reliable?
Maint. Sensitive — Seal owners are not reporting dead rear motors. They are reporting a knock. On the German Seal forum a car with 35,000 km clacks from the front of the drivetrain on every load change when regeneration is set to High, and the workshop still had no part to name. Another Seal had both front dampers replaced under warranty at 23,000 km for a dull clack that had been there from delivery; the owner said the knock then went. The same damper story fills a long Seal U thread, so a clack on a test drive is a suspension job until someone proves it is the motor. The 12V on the wider BYD range is a separate, cheaper way to have a car that will not open — Seal U owners were replacing one every few months and were told the 12V warranty is 12 months or 20,000 km. This pass did not find a Sealion 7 motor failure of its own. Buy the car that is quiet over a broken surface and that still unlocks after a weekend.
What are the common problems and reviews for the Byd Sealion 7 BYD Blade rear motor (Seal / Sealion 7)?
The most commonly reported problems: Knock on a load change, workshop unsure, Front dampers replaced for a clack that was there from new, 12V cover is short, and a flat one locks the car.
Is a used Byd Sealion 7 BYD Blade rear motor (Seal / Sealion 7) worth buying?
Fine if serviced correctly — but it punishes neglect hard. History and the right consumables matter.