P0740Buick EnvisionYears: 1996 - 2026
Torque Converter Clutch Circuit Malfunction
Reviewed by ASE Certified Technician
What does this mean?
Code P0740 indicates a malfunction in the torque converter clutch (TCC) solenoid circuit. The TCC locks the torque converter to the engine for improved fuel efficiency at highway speeds.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Buick Envision models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.
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Common Causes
Faulty torque converter or lockup clutch
Faulty transmission shift solenoid
Low, dirty, or burnt transmission fluid
Damaged, chafed, or broken wiring harness
Worn or faulty transmission valve body
Symptoms to Watch For
- Check Engine Light is illuminated
- Transmission slipping between gears
- Decreased fuel economy
- Unusual vibration during driving
- Engine stalling or dying unexpectedly
- Hard or harsh gear shifting