B1801 — manufacturer-specific body code

B1801 is a manufacturer-specific body code: it is defined by the carmaker, not by the OBD-II standard, so the same code can mean different things on different brands. Below are the vehicles and failure patterns where owners report it, drawn from NHTSA complaints — the most reliable guide to what it means in practice.

In our record, B1801 is reported only on Toyota vehicles , against airbags and electrical failure patterns , across 2005–2008 model years.

In ProblemsByVin's analysis of the NHTSA owner-complaint record, owners cite B1801 across 8 vehicle failure patterns. Diagnostic codes in complaints are reported by owners and are unverified — they point to where this code shows up, not a confirmed diagnosis. Open a page below for the full pattern (symptoms, mileage, repair costs owners cite).

Vehicles where owners report B1801 8 patterns

Codes are pulled from what owners wrote in their NHTSA filings — they're allegations, not a shop diagnosis. Always confirm with a live scan. Browse all diagnostic codes →