P0740moderate severityPowertrain
Torque Converter Clutch Circuit Malfunction
on 2014 Ram 2500 6.7L I6 Cummins Diesel · 4WD
What this code means
Malfunction in the torque converter clutch (TCC) solenoid circuit.
Symptoms
- Check Engine Light
- No lockup feel (higher RPM at highway)
- Poor fuel economy
- Transmission overheating
Common causes
- Faulty TCC solenoid
- Wiring issue
- PCM driver failure
- Torque converter failure
Diagnostic steps
- Test TCC solenoid resistance
- Check wiring
- Command TCC engagement with scan tool
- Monitor RPM drop during lockup command
Repair notes
Replace TCC solenoid or repair wiring. Solenoid is often inside transmission.
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P0002
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P0003
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P0004
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P0010
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P0011
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P0012
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P0013
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P0014
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P0015
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