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Diagnose/P0748
P0748Medium SeverityTransmission

Torque Converter Clutch System Malfunction

What This Means

The torque converter clutch system has a general malfunction. This affects fuel economy and driveline behavior at highway speeds.

Common Symptoms

  • Fuel economy change
  • Shudder at speed
  • Stalling at stops
  • Check engine light on

Common Causes

  • TCC solenoid issue
  • Fluid contamination
  • Valve body wear
  • Internal converter damage
  • Wiring fault

Estimated Repair Cost

$200 – $1500
Parts and labor (varies by vehicle and location)
Difficulty:Professional

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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.