P0651 on Chevrolet Impala
Sensor Reference Voltage B Circuit/Open
Methodology: Reviewed against the SAE J2012 generic DTC definition and NHTSA owner-complaint patterns, then scoped to Chevrolet Impala context without treating complaints as confirmed diagnoses.
Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).
- SAE J2012 Diagnostic Trouble Code Definitions — Generic diagnostic trouble code definition reference for P0651.
- NHTSA recalls, complaints, and manufacturer communications — Used to check public owner complaint context, recall status, and safety-related manufacturer communications by VIN or vehicle.
Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.
What P0651 Means on Your Chevrolet Impala
P0651 is a diagnostic trouble code indicating: Sensor Reference Voltage B Circuit/Open. This code relates to the computer and output circuits system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.
Real Chevrolet Impala Owner Reports
Source: NHTSA Complaints Database
"When driving through st. louis around midnight on i-270 on may 3, the "engine power is reduced" message came on and the car slowed dramatically right in the middle lane of the interstate. quite scary indeed, not to mention the lurching."
"Driving home one night after just having my vehicle repaired a few weeks earlier, without warning, my vehicle began to stall. just before the stall it was driving completely normal with no issues at all."
All reports filed by vehicle owners directly with the U.S. Department of Transportation.
📊 Complaint Trend by Model Year
Common Causes on Chevrolet Impala
Based on NHTSA complaint component analysis for this vehicle.
What To Do Next
-
1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
-
2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
-
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.