P0743 on Volvo
Torque Converter Clutch Circuit Electrical
P0743 on Volvo vehicles indicates torque converter clutch circuit electrical. Au7o has documented this code across 1 Volvo model — most commonly on XC70. This code indicates an electrical fault in the torque converter clutch (TCC) circuit, the wiring and solenoid that lock the torque converter so the engine and transmission turn together for better efficiency at cruising speed. The transmission computer commands the TCC solenoid on and off, and when it sees an open, short, or out-of-range electrical signal in that circuit, it sets this code. You may notice slipping, harsh or no lockup, reduced fuel economy, or the transmission staying in a lower gear. Because it is an electrical-circuit code, the problem is usually in the solenoid, connector, or wiring rather than worn mechanical clutch material. Typical repair costs on Volvo range from $500 to $5,000, depending on the specific model and root cause.
Common Causes of P0743
- •Failed torque converter clutch (TCC) solenoid
- •Open, shorted, or corroded wiring in the TCC circuit
- •Damaged or loose transmission connector
- •Low or contaminated/dirty transmission fluid
- •Faulty transmission valve body or internal harness
- •Failed torque converter (internal clutch)
- •Faulty transmission control module (TCM/PCM)
P0743 on Volvo by Model
Volvo XC70(1 issue)
- Aisin AW55-50/51SN Transmission Failure and Solenoid Issues2001-2012
The Aisin AW55-50SN and AW55-51SN automatic transmissions used in the XC70 develop solenoid failures and internal clutch wear, typically between 100,000-150,000 miles. The transmission solenoids (particularly the SL1 and SL2 linear solenoids) lose calibration and stick, causing harsh shifting, delayed engagement, and slipping. The valve body accumulates wear debris that causes erratic shifting. In severe cases, the forward or reverse clutch packs burn out, requiring a complete rebuild or replacement. Regular fluid changes significantly extend transmission life.
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What does P0743 mean on Volvo?▼
P0743 stands for "Torque Converter Clutch Circuit Electrical." This code indicates an electrical fault in the torque converter clutch (TCC) circuit, the wiring and solenoid that lock the torque converter so the engine and transmission turn together for better efficiency at cruising speed. The transmission computer commands the TCC solenoid on and off, and when it sees an open, short, or out-of-range electrical signal in that circuit, it sets this code. You may notice slipping, harsh or no lockup, reduced fuel economy, or the transmission staying in a lower gear. Because it is an electrical-circuit code, the problem is usually in the solenoid, connector, or wiring rather than worn mechanical clutch material. On Volvo specifically, this code is documented across 1 model.
What causes P0743 on Volvo vehicles?▼
Common causes on Volvo: Failed torque converter clutch (TCC) solenoid, Open, shorted, or corroded wiring in the TCC circuit, Damaged or loose transmission connector, Low or contaminated/dirty transmission fluid, Faulty transmission valve body or internal harness. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0743 on a Volvo?▼
Repair costs on Volvo range from $500 to $5,000, depending on the specific model and root cause.
Which Volvo models have P0743 documented?▼
Au7o has documented P0743 on 1 Volvo model: XC70.