P0463 on GMC ENVOY
Fuel Level Sensor A Circuit High
Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.
Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).
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 P0463 Means on Your GMC ENVOY
P0463 is a diagnostic trouble code indicating: Fuel Level Sensor A Circuit High. This code relates to the emission controls system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.
Real GMC ENVOY Owner Reports
Source: NHTSA Complaints Database
"Seems that the fuel gauge reads empty even after i fill it up. it will chime, illuminate the low fuel light and read"
All reports filed by vehicle owners directly with the U.S. Department of Transportation.
Common Causes on GMC ENVOY
Based on NHTSA complaint component analysis for this vehicle.
What To Do Next
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1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
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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.
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3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.