P0743
PowertrainTransmission Solenoidmoderate severityManufacturer-specificTorque Converter Clutch Circuit Electrical
What P0743 Means
There is an electrical fault in the torque converter clutch solenoid circuit. This is the generic OBD-II P0743 code, usually an open or short in the solenoid or wiring.
Symptoms
- Torque converter won't lock
- Reduced fuel economy
- Transmission warning light
Common Causes
- Failed TCC solenoid
- Open or shorted circuit
- Corroded connector
- Faulty transmission control module
Diagnostic Steps
- Scan for codes
- Test TCC solenoid resistance
- Check wiring for opens or shorts
- Replace solenoid if electrically faulty
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Any of these will read and clear this code — pick by how deep you want to go.
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ANCEL AD410 →
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Serious DIY~$100
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Autel MaxiCOM MK808S →
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Autel MaxiSys MS906 Pro →
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✓ Autel official store
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