Fuel Volume Regulator Control Exceeded Learning Limit
The ECU's adaptive correction of fuel volume regulator A has reached its learning limit. Indicates a long-term drift between commanded and actual rail pressure that could no longer be compensated.
Affected components
- High pressure fuel pump
- Fuel volume regulator
- Fuel filter
- Fuel rail pressure sensor
Common causes
- High likelihood: HP pump worn out
- Medium likelihood: Fuel filter clogged, restricted supply
- Medium likelihood: Internal leak (injector or rail)
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
- Reduced-power or limp mode may occur
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.