P0651 — Sensor reference voltage "B" circuit — open

Code P0651 is a standard OBD-II diagnostic trouble code: Sensor reference voltage "B" circuit — open.

In our record, P0651 is reported most often on Chevrolet, Hyundai and Volkswagen vehicles , against electrical and powertrain failure patterns , across 2005–2023 model years.

In ProblemsByVin's analysis of the NHTSA owner-complaint record, owners cite P0651 across 7 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 P0651 7 patterns

2023 Hyundai Sonata

powertrain — Complete Power Loss While Driving

2010 Chevrolet Cobalt

electrical — Engine power reduction / limp mode / stalling

2010 Chevrolet Impala

cruise control — Sudden Power Loss and Engine Shutdown

2010 Volkswagen Jetta

fuel system — High-pressure fuel pump (HPFP) failure

2008 Chevrolet Impala

electrical — Engine Power Reduced / Throttle System Limp Mode

2008 Pontiac G6

powertrain — Transmission shift cable detachment or fracture

2005 Cadillac STS

electrical — Unexpected engine shutdown / loss of electrical power while driving

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 →