P1111High SeverityFuel System

GM: Intake/fuel System Code 11

What This Means

This GM manufacturer-specific code indicates an issue with the intake/fuel system. Code P1111 requires GM diagnostic procedures and may need dealer-level tools for complete diagnosis.

Common Symptoms

Check engine light on
Performance issue
Fuel system concern
Emissions or driveability change

Common Causes

GM-specific intake/fuel component
Wiring harness issue
Sensor failure
PCM calibration error
Connector problem

Estimated Repair Cost

$225 – $600

Parts and labor (varies by vehicle and location)

Difficulty:Advanced

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For informational purposes only. Diagnostic trouble codes are starting points for diagnosis, not definitive answers. Always consult a certified mechanic for proper diagnosis and repair. Estimated costs vary by vehicle, location, and shop rates.