P0742 on Volvo
Torque Converter Clutch Circuit Stuck On
P0742 on Volvo vehicles indicates torque converter clutch circuit stuck on. Au7o has documented this code across 3 Volvo models — most commonly on S60, S80, XC70. P0742 means the torque converter clutch (TCC) circuit is stuck on, meaning the lockup clutch that mechanically links the engine to the transmission stays engaged when it should release. The computer commands the clutch on and off, and when it detects the converter clutch remaining applied, it sets this code. The classic symptom is the engine stalling when coming to a stop, similar to driving a manual without pushing the clutch in, along with possible harsh shifts or poor fuel economy. It points to a hydraulic or solenoid problem inside the transmission rather than the engine. Typical repair costs on Volvo range from $300 to $5,000, depending on the specific model and root cause.
Common Causes of P0742
- •Stuck or failed torque converter clutch solenoid
- •Stuck valve in the valve body (TCC apply valve)
- •Contaminated or degraded transmission fluid
- •Internal transmission hydraulic leak holding the clutch on
- •Wiring or connector fault to the TCC solenoid
- •Faulty torque converter
- •Dirty or clogged transmission filter
P0742 on Volvo by Model
Volvo S60(1 issue)
- 8-Speed Automatic Delayed Engagement and Hesitation2019-2023
The Aisin Warner 8-speed automatic in the S60 T5 and T6 exhibits delayed engagement when shifting from Park to Drive or Reverse, and hesitation during low-speed maneuvers. Owners report a 1-2 second delay before the car moves after selecting Drive, and jerky behavior in parking lots. The issue is linked to TCM software calibration that prioritizes fuel economy over responsiveness, and torque converter clutch engagement logic. Cold weather amplifies the delay. Volvo has released multiple TCM software updates.
Volvo S80(1 issue)
- Aisin TF-80SC 6-Speed Transmission Shudder and Valve Body Failure2007-2016
The Aisin TF-80SC 6-speed automatic transmission in the S80 develops valve body issues and torque converter shudder, particularly between 60,000-100,000 miles. The valve body solenoids lose calibration, causing harsh shifts and delayed engagement. The torque converter lockup clutch shudders at 30-50 mph under light throttle. The transmission fluid breaks down over time (despite Volvo's 'lifetime fill' claim), accelerating internal wear. This same transmission is used across many Volvo models (S60, V70, XC60, XC70, XC90) and has a well-documented failure pattern.
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 P0742 mean on Volvo?▼
P0742 stands for "Torque Converter Clutch Circuit Stuck On." P0742 means the torque converter clutch (TCC) circuit is stuck on, meaning the lockup clutch that mechanically links the engine to the transmission stays engaged when it should release. The computer commands the clutch on and off, and when it detects the converter clutch remaining applied, it sets this code. The classic symptom is the engine stalling when coming to a stop, similar to driving a manual without pushing the clutch in, along with possible harsh shifts or poor fuel economy. It points to a hydraulic or solenoid problem inside the transmission rather than the engine. On Volvo specifically, this code is documented across 3 models.
What causes P0742 on Volvo vehicles?▼
Common causes on Volvo: Stuck or failed torque converter clutch solenoid, Stuck valve in the valve body (TCC apply valve), Contaminated or degraded transmission fluid, Internal transmission hydraulic leak holding the clutch on, Wiring or connector fault to the TCC solenoid. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0742 on a Volvo?▼
Repair costs on Volvo range from $300 to $5,000, depending on the specific model and root cause.
Which Volvo models have P0742 documented?▼
Au7o has documented P0742 on 3 Volvo models: S60, S80, XC70.