P1B25 has a source-scoped interpretation in a manufacturer document. Check the raw form, vehicle conditions and original bulletin before using it.
This meaning belongs to the cited manufacturer document and its conditions. It is not a universal code definition, a VIN-specific match, a driving clearance or a parts diagnosis. Independent safety review remains pending.
This Hyundai document supports only its stated code and vehicle context. The code alone cannot identify a failed part, prove that another make uses the same definition, or clear a car for driving. Compare your full scan with the current exact-vehicle service information.
Read the Hyundai original: Sonata Hybrid safety plug / power relay assembly diagnosis Source date: 2023-06; research checked: 2026-11-01.
What the manufacturer document says
The same root can have a different meaning or role in another module or vehicle. Preserve the full raw code and suffix rather than applying this table to every car.
| Raw form | Meaning in source | Document | Case context |
|---|---|---|---|
| P1B25 | High-voltage path fault in the cited Hyundai application. | Hyundai 23-HC-001H | Sonata Hybrid no READY: power-relay/safety-plug diagnosis |
| P1B25 | High-voltage path fault in the cited Kia application. | Kia ELE273 / WTY029 | Optima Hybrid P1B25/P1B77 and WTY029 fuse coverage |
Vehicle scope recorded in the source
- Hyundai Sonata Hybrid · 2011, 2012, 2013, 2014, 2015 · YF hybrid
- Kia Optima Hybrid · 2013, 2014, 2015, 2016 · TF hybrid; Built 2012-09-27 through 2015-07-22
What to record before clearing the code
- Photograph the exact stop message and report whether READY appears.
- Retain previous hybrid repair invoices and record READY/propulsion symptoms.
- Note other codes and the exact dashboard message; a generic reader may miss the affected module.
Questions before a repair or part order
- Do not remove the HV safety plug, fuse or orange-cable connectors.
- Do not treat an online HV fuse as an owner-installable quick fix.
- Does the current manufacturer document cover this VIN, engine, build date and symptom?
- Is a recall, warranty or newer service communication relevant? A bulletin alone is not free-repair eligibility.
How to use this research note
The source document is historical and may have a later revision. Its cited vehicle table is a condition to verify, not a complete list of affected VINs. A code can be secondary to another fault. If braking, steering, propulsion, temperature, smoke, fuel or high-voltage behavior is unsafe, stop safely and seek qualified help rather than using this page to continue driving.
Sources and scope
- Hyundai — Sonata Hybrid safety plug / power relay assembly diagnosis (23-HC-001H) Document: 2023-06 · Research checked: 2026-11-01
- Kia — Optima Hybrid high-voltage fuse warranty-extension diagnostic path (ELE273 / WTY029) Document: 2023-01 · Research checked: 2026-11-01
Research snapshot: 2026-11-01. Source documents may have newer revisions. Verify current instructions and VIN eligibility with the manufacturer.