P0451 — OBD-II trouble code

A generic powertrain OBD-II trouble code. Below are the vehicles and failure patterns where owners report it, drawn from NHTSA complaints.

In ProblemsByVin's analysis of the NHTSA owner-complaint record, owners cite P0451 across 6 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 P0451 6 patterns

2023 Hyundai Sonata

powertrain — Fuel Tank Expansion

2023 Volkswagen Tiguan

engine — EVAP and emissions faults with CAN-bus communication errors

2021 Kia K5

electrical — Stalling and loss of power while driving

2020 Cadillac CT5

powertrain — Transmission valve body/control valve defects

2010 Ford Focus

powertrain — Loss of throttle/acceleration authority with wrench light

2006 Ford Explorer

fuel system — EVAP canister / fuel-system vent failure

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 →