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Home›Trouble codes›P1B77› Kia
Diagnostic trouble code · Kia

P1B77 on Kia vehicles

P1B77 is named on 8 Kia model years (2016–2025): 25 manufacturer filings and 0 owner reports in NHTSA’s files, across Optima, Niro, Sorento.

Powertrain 8 model years 25 manufacturer filings

Which Kia model years name P1B77

Source: NHTSA manufacturer communications and complaints
Model yearFiled underBulletinsOwner reports
2019 Kia OptimaElectrical System6—
2018 Kia OptimaElectrical System6—
2017 Kia OptimaElectrical System6—
2017 Kia NiroElectrical System3—
2025 Kia SorentoElectrical System1—
2019 Kia NiroElectrical System1—
2018 Kia NiroElectrical System1—
2016 Kia OptimaElectrical System1—

A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.

Electrical System 25
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Kia filings that name P1B77

Source: NHTSA manufacturer communications

Bulletins and campaigns Kia filed with NHTSA whose summary names P1B77. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

What P1B77 means

Source: SAE J2012 / OBD-II

P1B77 is a manufacturer-specific code: the second character is a 1, which under the OBD-II standard hands the definition to whoever built the vehicle. The same code can mean one thing on a Ford and something unrelated on a Hyundai. Any site that prints a single definition for it is guessing.

A stored code names the test that failed, never the part that caused it. The record above is what Kia and its owners have filed about it; the code’s page across every make has the whole file.

From here
Get a model's new bulletins by email See what owners reported Look up a bulletin by its number Watch a VIN for new recalls

Common questions

Source: NHTSA files and the OBD-II standard

Is P1B77 a known problem on Kia vehicles?

It is a documented one: NHTSA's files hold 25 manufacturer filings and 0 owner reports naming P1B77 on 8 Kia model years (2016–2025). Whether it is a problem on one particular car is a diagnosis, not a count — but a bulletin that names the code on your model year is the place to start.

Which Kia models does P1B77 appear on most?

2019 Optima (6 documents), 2018 Optima (6 documents), 2017 Optima (6 documents).

Does P1B77 on a Kia mean it is recalled?

No. Recalls are filed by campaign and matched by VIN; no recall is triggered by a scan tool. Check the VIN at nhtsa.gov/recalls, or open the model year's page here for the campaigns filed against it.

Where to go next

pages beside this code
Filed alongside P0456 Another code that appears in the same filings and owner reports as P1B77.Filed alongside P0303 Another code that appears in the same filings and owner reports as P1B77.Vehicle 2019 Kia Optima The model year P1B77 is filed against most often.The data Trouble codes by API GET /v1/dtc joins every code to bulletins and owner reports — free tier, no card.