DTC Advanced Diagnostics: P0796
DTC P0796 : CVT Clutch Pressure Control Solenoid Valve Performance or Stuck OFF
General Description
The CVT clutch pressure control solenoid valve controls hydraulic pressure to the forward clutch and the reverse brake. The CVT clutch pressure control solenoid valve is controlled by duty cycle output. The spool in the CVT clutch pressure control solenoid valve moves the valve according to the current, and produces hydraulic pressure in proportion to the current. To supply proper forward clutch/reverse brake hydraulic pressure, the transmission control module (TCM) outputs a CVT clutch pressure control solenoid valve hydraulic pressure control signal. If the torque converter turbine speed and drive pulley speed does not match when forward clutch/reverse brake is engaged at a specified vehicle speed condition, the TCM detects a CVT clutch pressure control solenoid valve stuck OFF failure and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 30 seconds or less |
| DTC Type | Two drive cycles, MIL on, Shift position indicator blinks |
Enable Conditions
| Condition | Minimum | Maximum | |
|---|---|---|---|
| Engine speed [Engine Speed] | 500 rpm | - | |
| Forward clutch/reverse brake commanded pressure | 206 kPa (2.1 kgf/cm 2, 29.9 psi) | - | |
| Vehicle speed [Vehicle Speed] | - | 1 mph (3 km/h) | |
| Shift position/mode | D, S, R | ||
[ ]: HDS Parameter
Malfunction Threshold
The rotation speed between the torque converter turbine speed [Torque Converter Turbine Speed] and the drive pulley speed [Input Shaft (Drive Pulley) Speed rpm] is 250 rpm or more.
Possible Cause
The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- CVT clutch pressure control solenoid valve stuck off
Confirmation Procedure
Operating Condition
- Start the engine.
- With the brake pedal pressed, place the shift from N position/mode to D position/mode, and wait for at least 30 seconds.
- Turn the vehicle to the OFF (LOCK) mode.
- Repeat Driving Pattern steps 1 through 2.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the TCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on, the shift position indicator blinks, and a Confirmed DTC and the freeze data are stored.
Conditions for clearing the DTC
The shift position indicator comes off by turning the vehicle to the OFF (LOCK) mode. The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool clear command.