DTC P0748: Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1); DTC P0778: Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2); DTC P0798: Pressure Control Solenoid "C" Electrical (Shift Solenoid Valve SL3); DTC P2810: Pressure Control Solenoid "G" Electrical (Shift Solenoid Valve SL4); DTC P2819: Pressure Control Solenoid "H" Electrical (Shift Solenoid Valve SL5) [11/2021 - ]: Description
WARNING: This page is about a different car, the 2024 Lexus IS 500, 2023 Lexus IS 500, and 2022 Lexus IS 500. However, it is still accessible from the selected car via links, so may be relevant.
Based on the ON-OFF combinations of the shift solenoid valves SL1, 2, 3, 4 and 5, the TCM performs gear shifts from 1st gear to 8th gear.
If a circuit related to a solenoid valve is open or shorted, the TCM uses the fail-safe function to turn other solenoid valves ON or OFF. If all solenoid valves are malfunctioning, only the mechanical fluid pressure circuit will function and some manual operation will be possible. If an open or short has occurred, the TCM cuts power to the malfunctioning solenoid valve.
HINT:
The following table shows normal operation of the shift solenoid valves SL1, 2, 3, 4 and 5 when the shift lever is in D.
SHIFT SOLENOID VALVE OPERATION:
| Gear | 1st | 2nd | 3rd | 4th | 5th | 6th | 7th | 8th |
| Shift Solenoid Valve SL1 | ON | ON | ON | ON | ON | OFF | OFF | OFF |
| Shift Solenoid Valve SL2 | OFF | OFF | OFF | OFF | ON | ON | ON | ON |
| Shift Solenoid Valve SL3 | OFF | OFF | ON | OFF | OFF | OFF | ON | OFF |
| Shift Solenoid Valve SL4 | OFF | OFF | OFF | ON | OFF | ON | OFF | OFF |
| Shift Solenoid Valve SL5 | OFF | ON | OFF | OFF | OFF | OFF | OFF | ON |
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory |
|---|---|---|---|---|---|
| P0748 | Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1) | 1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other
|
|
Comes on | DTC stored |
| P0778 | Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2) | 1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other
|
|
Comes on | DTC stored |
| P0798 | Pressure Control Solenoid "C" Electrical (Shift Solenoid Valve SL3) | 1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other
|
|
Comes on | DTC stored |
| P2810 | Pressure Control Solenoid "G" Electrical (Shift Solenoid Valve SL4) | 1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other
|
|
Comes on | DTC stored |
| P2819 | Pressure Control Solenoid "H" Electrical (Shift Solenoid Valve SL5) | 1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other
|
|
Comes on | DTC stored |