- Vehicles
- Cars
High-voltage battery fault warning light
BYD high-voltage battery fault warning light on car cluster
Risk level
High
Professional inspection is recommended.
Urgency
Immediate
Quick answer
If the high-voltage battery fault warning light (or powertrain fault warning light) stays on after switching on your BYD or illuminates while driving or charging, stop safely or stop charging and contact a BYD authorized dealer or service provider as soon as possible.
Safety first
Stop and check this first
- Do not keep driving when the high-voltage battery fault warning light or powertrain fault warning light is on: park in a safe place, switch off the vehicle and contact a BYD authorized dealer or service provider.
- Never touch, open or attempt to repair high-voltage cables, connectors or battery pack components yourself: all inspection and service on the high-voltage system must be performed by a BYD authorized service provider.
Safe checks you can perform
- Check whether the light turns off after the ignition self-check
- If the light appears while charging, stop charging immediately
- Note any companion powertrain or overheating warning lights
Leave these tasks to a qualified professional
- Do not attempt this professional task: Authorized high-voltage system repair and post-repair verification
- Do not attempt this professional task: High-voltage battery and powertrain fault code diagnosis
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Authorized high-voltage system repair and post-repair verification
What they doQualified BYD technicians repair or replace the faulty high-voltage battery or powertrain component and verify that the warning light extinguishes a few seconds after ignition on.
They must show youthe instrument cluster with the high-voltage battery fault warning light turning off normally after start-up.
In writingthe components repaired or replaced and confirmation that the high-voltage system passed all safety and road tests.
High-voltage battery and powertrain fault code diagnosis
What they doA BYD authorized dealer or service provider connects diagnostic equipment to read the fault codes stored by the high-voltage battery management and powertrain control systems.
They must show youthe diagnostic printout listing the high-voltage battery and powertrain fault codes and cell parameters.
In writingthe fault codes retrieved, the specific monitored component at fault and the diagnostic checks completed.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Check whether the light turns off after the ignition self-check
- Who:
- you, from the driver's seat when switching the vehicle on.
- How:
- switch the ignition on without driving off and watch whether the high-voltage battery fault warning light goes out after a few seconds or remains steady on.
- Result that matters:
- separating the normal bulb check of a few seconds from an active high-voltage battery system fault.
- If it turns off after a few seconds and stays off:
- that was the normal start-up check.
- If it stays steady on or turns on while driving:
- stop safely, do not continue driving and contact BYD service.
- Evidence to keep:
- a photo or short clip of the instrument cluster after switching the ignition on.
Evidence: BYD ATTO 3 2025 owner's manual (left-hand drive) · BYD NEW TANG Manual del propietario (con volante a la izquierda)
If the light appears while charging, stop charging immediately
- Who:
- you, if the vehicle is connected to charging equipment.
- How:
- follow BYD's charging troubleshooting table: if a power system fault warning light or charging system fault message appears on the cluster, stop charging, unlock the vehicle and unplug the connector.
- Result that matters:
- safely ending the charging session before contacting a BYD authorized dealer or service provider.
- If the warning appeared during a charge session:
- leave the charger disconnected and note which station was used.
- If the warning appeared on the road:
- park in a safe place, power off the vehicle and arrange BYD assistance.
- Evidence to keep:
- a photo of the cluster warning and details of the charging equipment if it happened while plugged in.
Evidence: BYD ATTO 3 2025 owner's manual (left-hand drive) · BYD NEW TANG Manual del propietario (con volante a la izquierda)
Note any companion powertrain or overheating warning lights
- Who:
- you, once the vehicle is safely parked.
- How:
- check the instrument cluster for the powertrain fault warning light, limited EV power message or the high-voltage battery overheating warning light alongside the battery fault lamp.
- Result that matters:
- knowing whether you must also evacuate the car immediately due to battery overheating.
- If the high-voltage battery overheating light is flashing too:
- leave the vehicle as soon as possible.
- If only the battery fault or powertrain fault light is on:
- keep the car parked and contact BYD service.
- Evidence to keep:
- a photo showing all warning lights and messages illuminated on the instrument cluster.
Evidence: BYD ATTO 3 2025 owner's manual (left-hand drive) · BYD NEW TANG Manual del propietario (con volante a la izquierda)
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Vehicles
- Brand
- BYD
- Product type
- Cars
Known code variants
- BYD EV power limited
- BYD high-voltage battery fault light
- BYD Luz de advertencia de fallo de la cadena cinemática
- BYD Potencia EV limitada
- BYD power battery fault indicator
- BYD Powertrain fault warning light
- BYD testigo fallo batería alta tensión
- High-voltage battery fault warning light
- Luz de advertencia de fallo de la batería de alta tensión
What it means
In the BYD owner's manuals (ATTO 3 and NEW TANG), the high-voltage battery fault warning light comes on when the ignition is switched on and turns off in a few seconds if the high-voltage battery system is working properly. If it remains steady on when the ignition is on, or stays steady on or occasionally turns on while driving, there are faults in the components monitored by the warning light system. BYD also documents the powertrain fault warning light (cautioning you to try not to drive the vehicle when it is on) and the 'EV power limited' prompt. The light alone does not identify which monitored component is faulty.
Warnings and stop conditions
- Highsource verified
Do not keep driving when the high-voltage battery fault warning light or powertrain fault warning light is on: park in a safe place, switch off the vehicle and contact a BYD authorized dealer or service provider.
Evidence: BYD ATTO 3 2025 owner's manual (left-hand drive) · BYD NEW TANG Manual del propietario (con volante a la izquierda)
- Highsource verified
Never touch, open or attempt to repair high-voltage cables, connectors or battery pack components yourself: all inspection and service on the high-voltage system must be performed by a BYD authorized service provider.
Evidence: BYD ATTO 3 2025 owner's manual (left-hand drive) · BYD NEW TANG Manual del propietario (con volante a la izquierda)
Symptoms and causes
Probable causes · in order
- Fault in components monitored by the high-voltage battery warning systemCommon
The BYD manual states that if the warning light stays steady on at ignition or lights up again while driving, a monitored component of the high-voltage battery system has a fault.
Evidence: BYD ATTO 3 2025 owner's manual (left-hand drive) · BYD NEW TANG Manual del propietario (con volante a la izquierda)
- Powertrain fault or electric drive power limitationPossible
When the issue involves the electric drive system, the instrument cluster may also illuminate the powertrain fault warning light or display a limited EV power prompt.
Evidence: BYD ATTO 3 2025 owner's manual (left-hand drive) · BYD NEW TANG Manual del propietario (con volante a la izquierda)
- Power system abnormality detected during external chargingPossible
BYD's charging troubleshooting table notes that a vehicle or charging connector failure during charging can trigger a power system fault warning light on the cluster.
Evidence: BYD ATTO 3 2025 owner's manual (left-hand drive) · BYD NEW TANG Manual del propietario (con volante a la izquierda)
Virtual technician
Does High-voltage battery fault warning light still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
BYD ATTO 3 2025 owner's manual (left-hand drive)
BYD Auto Co. Ltd. · 2025 · manual
- 2
BYD NEW TANG Manual del propietario (con volante a la izquierda)
BYD Auto Co. Ltd. · 2025 · manual
Was this entry useful?