Live Manual
Engine Error

P0740

Torque Converter Clutch Circuit Malfunction

Severity
Medium

Symptoms

Check engine light, decrease in fuel economy, no noticeable lockup at highway speeds

Common Causes

  • Defective TCC solenoid
  • Wiring harness open or shorted
  • Dirty transmission fluid
  • Failed torque converter

How to Fix

  1. 1 Test and replace TCC solenoid
  2. 2 Repair wiring to transmission
  3. 3 Perform fluid and filter change
  4. 4 Replace torque converter
Estimated Repair Cost USD
$150 $1800

TCC Solenoid: $250 - $500; Torque Converter: $1,200 - $1,800