Tesla · EVs

Tesla Diagnostics
alerts, not OBD codes

Teslas don't use the classic check-engine-light P-codes. Here's how Tesla alerts work, how to read them, and what the most common warnings mean.

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Part 1 · The basics

Tesla check engine light codes

Unlike petrol cars, Tesla vehicles do not expose standard OBD-II P-codes through the diagnostic port. Instead, the car uses a service-alert system (alerts like VCFRONT_a192 or BMS_a064) shown on the touchscreen or in Service Mode.

Below are the most commonly seen Tesla alerts and what they mean — plus how to check them yourself.

Part 3 · The dictionary

Common Tesla service alerts

Tesla doesn’t use OBD-II P-codes: here are the most frequent alerts and what they mean.

Code Description
VCFRONT_a192 12V battery low / service needed
BMS_a064 Battery management system warning
GTW_w209 Gateway configuration / connection issue
CHG_w003 Charging interrupted / reduced power
TPMS_w013 Tire pressure monitoring warning
DI_w101 Drive unit / traction system alert
Part 4 · Common faults

Common Tesla faults

Common Tesla alerts and what they mean.

1

VCFRONT_a192 — 12V battery low: replace the 12V battery or check the DC-DC converter.

2

BMS_a064 — high-voltage battery system warning: schedule service.

3

GTW_w209 — gateway configuration/connection: often fixed with a reboot or software update.

4

CHG_w003 — charging interrupted: check the cable, connector and charging limit.

5

TPMS_w013 — tire pressure: inflate to the recommended pressure.

Part 4 · Common faults

Tesla FAQ

Can I scan a Tesla with an OBD-II scanner?
Tesla does not support standard OBD-II diagnostic protocols. Third-party tools (Scan My Tesla, OBD adapters) can read some data on certain models, but official alerts come from the car itself or Service Mode.
How do I see Tesla service alerts?
Most alerts appear as messages on the touchscreen. You can also enable Service Mode in the software settings to view detailed alerts, logs and self-tests.
What does the 12V battery alert mean?
VCFRONT_a192 warns the 12V battery is low. It usually needs replacing, or the DC-DC converter is not charging it. Do not ignore it — a dead 12V leaves the car undrivable.
Is BMS_a064 serious?
The battery management system is flagging the high-voltage battery. Schedule service — do not attempt repairs yourself on the HV system.
Do Teslas need a scanner for maintenance?
No. Tesla maintenance (tires, cabin filter, brake service) is scheduled from the app, and diagnostics are handled via Service Mode and remote diagnostics.

Codes vary slightly by model, year and engine. Always confirm with a proper diagnosis. Manufacturer-specific codes (P1xxx/P2xxx) may differ from generic descriptions.

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