P1743 on Audi
Torque Converter Clutch Solenoid Failed On
P1743 on Audi vehicles indicates torque converter clutch solenoid failed on. Au7o has documented this code across 1 Audi model — most commonly on A6. 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.
Common Causes of P1743
- •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
P1743 on Audi by Model
Audi A6(1 issue)
- 2006 A6 Multitronic 01J Delayed D/R Engagement - Check the Axial-Seal TSB2006
Audi TSB 2013280/4 addresses a specific loss-of-pressure condition in Multitronic transmissions produced from May 2005 through May 2006. The vehicle may not move or may engage Drive or Reverse only after a delay and increased engine speed; P1743/18151 may be stored. Audi attributes the covered condition to production-damaged axial seals, but its repair depends on the selected direction and measured transmission values. The previous card incorrectly treated every 2005-2011 C6 A6 transmission complaint as inevitable chain/hydraulic failure, claimed complete replacement was usually the only economical repair, mixed transmission families, and linked a generic rebuilt-mechatronic search. This corrected record applies only when the vehicle actually has the front-wheel-drive 01J Multitronic and falls in the bulletin's production window.
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View P1743 across all makes →Frequently Asked Questions
What does P1743 mean on Audi?▼
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. On Audi specifically, this code is documented across 1 model.
What causes P1743 on Audi vehicles?▼
Common causes on Audi: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1743 on a Audi?▼
Repair costs vary widely depending on the root cause and specific Audi model.
Which Audi models have P1743 documented?▼
Au7o has documented P1743 on 1 Audi model: A6.