P0740
Medium SeverityTorque Converter Clutch Circuit
Transmission System
What Does P0740 Mean?
Fault in the torque converter clutch (TCC) solenoid circuit.
Common Fix
Replace TCC solenoid
Estimated Cost (DIY)
$30 - $100
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
OEM Diagnostic Flowchart
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Related Resources
Repair guides, symptom pages, and wiring diagrams related to P0740.
OEM Manual Evidence
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A L L Diagnostic Trouble Codes ( DTC ) — 2013 Infiniti G37 Coupe V6-3.7L (VQ37VHR) Service Manual | Operation CHARM Operation CHARM : Car r...
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Exact Repair Workflows
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Related Symptoms
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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.
Related Repair Guides
If your vehicle has triggered P0740, these DIY repair guides may help: