BYD C1B9D22
EPS power voltage too high
Quick answer
DTC C1B9D22 means “EPS power voltage too high” on applicable BYD ATTO 3 vehicles. The verified evidence identifies the Steering/EPS system but does not establish the cause, symptoms, drivability, charging impact, or repair procedure.
This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.
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1. What does C1B9D22 mean?
DTC C1B9D22 means “EPS power voltage too high” on applicable BYD ATTO 3 vehicles. The verified evidence identifies the Steering/EPS system but does not establish the cause, symptoms, drivability, charging impact, or repair procedure.
2. Technical explanation
C1B9D22 is a BYD diagnostic trouble code for an Electronic Power Steering (EPS) condition described as “EPS power voltage too high.” The available technical-manual evidence establishes the code meaning only.
3. What system is affected?
Steering/EPS (Electronic Power Steering).
4. How serious is this code?
Unknown. Severity is not established by verified evidence.
5. Symptoms you may notice
- Not yet established by verified evidence.
6. Possible causes
- Not yet established by verified evidence.
7. Can I still drive the vehicle?
Unknown. Safe-to-drive status is not established by verified evidence.
8. Can I charge the vehicle?
Unknown. Safe-to-charge status is not established by verified evidence.
9. What you can safely do
- Do not attempt high-voltage or electrical-system repairs based on this code alone.
- Have the vehicle assessed by qualified BYD service personnel if the code is present.
10. Step-by-step troubleshooting
- Verified diagnostic steps are not yet established by the supplied evidence.
- A qualified service provider should use the applicable BYD diagnostic information for the vehicle.
11. When to contact service
Service requirement is unknown in the supplied data. Contact qualified BYD service personnel for diagnosis, particularly if a steering warning or steering concern is present.
12. What the service center may check
- Not yet established by verified evidence.
13. Possible repair or resolution
- Not yet established by verified evidence.
14. Affected vehicles
- BYD ATTO 3 · 2022–2026 · GLOBAL
15. Related TSBs / service bulletins
- Not yet established by verified evidence.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Verified source: OBDTotal technical manual index, “BYD ATTO 3 diagnostic evidence,” locator: ATTO 3 / Yuan Plus (SC2E) / C1B9D22. https://obdtotal.com/product/byd-atto3-yuanplus-sc2e-service-manual/
- OBDTotal technical manual index: BYD ATTO 3 diagnostic evidence · technical_manual
19. Frequently asked questions
What does BYD code C1B9D22 mean?
It means “EPS power voltage too high.”
Which system is affected by C1B9D22?
The Steering/EPS system is identified by the verified diagnostic record.
Which vehicles is this code documented for?
The supplied applicability data lists the global BYD ATTO 3, model years 2022 through 2026.
Is it safe to drive with C1B9D22?
Not yet established by verified evidence.
What repairs fix C1B9D22?
Not yet established by verified evidence.