Hyundai Accent: Intelligent Variable Transmission (IVT) System (Continuously Variable Transmission) / Troubleshooting
Limp Home Mode
Limp Home Mode features a fail-safe function that prevents dangerous situations in the event of a transmission failure. The vehicle will be driven in limp home mode if the transmission malfunctions. In this mode, the transmission operates at a minimal functionality level (fixed shifting, limited shifting, reverse, neutral), making it possible for the vehicle to reach a service center.
• Fail safe function : Prevents dangerous situations from developing in the event of a malfunction
• Limp home function : Maintains minimal functionality (Drive, Reverse, and Neutral) in the event of a malfunction, making it possible for the vehicle to reach a service center.
| Trouble symptom | Suspected area | Remedy |
| Poor shift quality | Faulty drive pulley speed sensor | Inspect the drive pulley speed sensor & connector |
| Faulty driven pulley speed sensor | Inspect the driven pulley speed sensor & connector | |
| Faulty turbine speed sensor | Inspect the turbine speed sensor & connector | |
| Faulty solenoid valve | Inspect the solenoid valve | |
| Faulty CAN communication | Inspect the CAN communication line & controller (TCM/ECM) | |
| Faulty Transmission Control Module(TCM) software | Inspect the TCM and replace it if necessary. | |
| After replacement, input hydraulic characteristics and perform TCM adaptive value learning. | ||
| TCM learning not performed | Perform the learning procedure again after deleting "IVT learning value" | |
| Faulty E-module | Inspect the E-module & connector | |
| Poor hydraulic pressure control | Inspect the transmission hydraulic pressure | |
| Poor hydraulic pressure supply | Check the fluid level | |
| No oil characteristics input after replacement of TCM or Intelligent Variable Transmission (IVT) | Input the hydraulic characteristics | |
| Slipping in the IVT, Damaged clutch/brake | Replace the IVT | |
| Faulty position switch | Inspect the position switch & connector | |
| Shifting shock | TCM learning not performed | Perform the learning procedure again after deleting "IVT learning value" |
| No hydraulic characteristics input after replacement of TCM or IVT | Perform the TCM adaptive value learning after hydraulic characteristics input | |
| Poor hydraulic pressure control | Check the IVT hydraulic pressure | |
| Poor hydraulic pressure supply | Check the IVTF level | |
| Improper installation of the IVT | Tighten the mounting bolt to the specified torque | |
| Damaged driven/drive pulleys, clutch/brake | Replace the IVT | |
| Abnormal noise from transmission | Damaged bearing/ parts stuck inside | Replace the IVT |
| Low IVTF level | Check the fluid level | |
| IVT shifting disabled | Damaged pulley chain belt | Replace IVT |
| Damaged gear/clutch/brake | Replace IVT |
Other information:
Hyundai Accent (HC) (2017 - 2022) Service Manual: Integrated Thermal Management Module (ITM)
- Components [Intelligent Variable Transmission (IVT) System] 1. Integrated thermal management module (ITM)2 . Integrated thermal management module (ITM) O-ring3. Heater pipe B4. Heater water hose5. Heater pipe A6 . Heater pipe A gasket7 . Water inlet fitting8 . Water inlet fitting gasket [Manual Transaxle System] 1. Integrated thermal management module (ITM)2 .Hyundai Accent (HC) (2017 - 2022) Service Manual: Timing Chain Cover
- Removal • Use fender covers to avoid damaging painted surfaces. • To avoid damage, unplug the wiring connectors carefully while holding the connector portion. • Mark all wiring and hoses to avoid misconnection. 1.Disconnect the battery negative terminal. 2.Remove the engine cover.(Refer to Engine and Transaxle Assembly - "Engine Cover") 3.
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