P1743 on 2006 Audi A6 (A6 Sedan, front-wheel drive, Multitronic 01J only) — Torque Converter Clutch Solenoid Failed On
1 vehicles · 1 makes
Most Reported On
P1743 is an OBD-II diagnostic trouble code meaning “Torque Converter Clutch Solenoid Failed On.” A manufacturer-specific transmission code used by Ford (and Ford-built Mazda applications). The powertrain/transmission control module commanded the torque converter clutch off but the monitored solenoid circuit indicated it stayed in the applied (on) state. Because the converter can stay locked, the engine may not decouple from the transmission at low speed, so the car can shudder or stall when coming to a stop, and the transmission may go to a failsafe strategy. Ford uses the neighboring code P1742 for the mechanical/hydraulic version of the same 'failed on' condition, so read both codes together before condemning a part. This code is most commonly reported on 2006 Audi A6 (A6 Sedan, front-wheel drive, Multitronic 01J only).
Common Causes
Diagnostic Tools
P1743 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does P1743 mean?
P1743 stands for "Torque Converter Clutch Solenoid Failed On." A manufacturer-specific transmission code used by Ford (and Ford-built Mazda applications). The powertrain/transmission control module commanded the torque converter clutch off but the monitored solenoid circuit indicated it stayed in the applied (on) state. Because the converter can stay locked, the engine may not decouple from the transmission at low speed, so the car can shudder or stall when coming to a stop, and the transmission may go to a failsafe strategy. Ford uses the neighboring code P1742 for the mechanical/hydraulic version of the same 'failed on' condition, so read both codes together before condemning a part.
What are the most common causes of P1743?
The most common causes of P1743 are: Failed or stuck-on torque converter clutch (TCC) solenoid, Low or contaminated transmission fluid affecting solenoid operation, Shorted or open wiring / connector corrosion in the solenoid circuit, Debris or a stuck valve in the valve body, Clogged transmission filter, Failed torque converter clutch itself, Faulty TCM/PCM solenoid driver circuit. The specific cause varies by vehicle.
How much does it cost to fix P1743?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P1743?
Au7o has documented P1743 across 1 vehicle models from 1 manufacturers: Audi.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.