P0740
Medium SeverityTorque Converter Clutch Circuit
Transmission System
P0740 — Instant Answer
Torque Converter Clutch Circuit
Severity: MEDIUM SEVERITY
Meaning: Fault in the torque converter clutch (TCC) solenoid circuit.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $30 - $100
Most common causes:
- 1. Failed TCC solenoid (35-45% of cases)
- 2. Wiring issue (10-25% of cases)
- 3. Worn torque converter (10-25% of cases)
Symptoms
- ⚠️Slight shudder at highway speed
- ⚠️Reduced fuel economy
- ⚠️Check engine light
Related Symptoms
Common Causes
How to Diagnose P0740
- 1Check TCC solenoid resistance
- 2Check wiring to transmission
- 3Scan for related codes
- 4May need solenoid replacement
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Related Resources
Repair guides, symptom pages, and wiring diagrams related to P0740.
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Related Codes
The TCC is not engaging when commanded.
The TCM (Transmission Control Module) has detected a fault and sent a message to the ECM. This is a general indicator that transmission-specific codes are stored.
The TCM detects that the actual gear ratio does not match the commanded gear.
Frequently Asked Questions
- What is the torque converter clutch?
- The TCC locks the torque converter at highway speed for better fuel economy. It is like a clutch inside the automatic transmission.
- Can I drive with P0740?
- Yes, but fuel economy drops 2-3 MPG and you may feel a slight shudder. Not urgent but fix when convenient.
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Author & Review
Written by AllOEMManuals Editorial Team. Reviewed by ASE-certified technicians and updated with factory-reference checks for fitment-sensitive steps.
This guide was drafted with AI assistance and reviewed for accuracy by a human editor.
Last updated: 2026-05-07