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Diagnose/P0988
P0988High SeverityTransmission

Transmission Torque Converter Circuit Low Input

What This Means

The transmission torque converter voltage is below minimum threshold. This component is integral to the transmission's hydraulic and electronic control systems.

Common Symptoms

  • Shift quality issues
  • Slipping
  • Harsh engagement
  • Check engine light on

Common Causes

  • Solenoid failure
  • Contaminated fluid
  • Internal wear
  • Wiring fault
  • TCM issue

Estimated Repair Cost

$200 – $2000
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.