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Diagnose/P1093
P1093High SeverityFuel System

GM: Fuel Rail Pressure Low During Power Enrichment

What This Means

On GM vehicles, the fuel rail pressure dropped below acceptable limits during high engine load. The fuel system cannot maintain adequate pressure for power enrichment.

Common Symptoms

  • Check engine light on
  • Performance concern
  • Emissions issue
  • Driveability change

Common Causes

  • GM-specific component failure
  • Wiring damage
  • Sensor malfunction
  • PCM calibration issue
  • Connector corrosion

Estimated Repair Cost

$200 – $1000
Parts and labor (varies by vehicle and location)
Difficulty:Moderate

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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.