DTC P0756
DTC P0756 : Shift Solenoid Valve B Stuck OFF
General Description
| Condition of over drive clutch | Shift solenoid valve A | ||
| ON (12 V) | OFF (0 V) | ||
| Shift solenoid valve B | ON (12 V) | ON (engaged) | OFF (disengaged) |
| OFF (0 V) | OFF (disengaged) | OFF (disengaged) | |
Shift solenoid valve B is installed on the flywheel housing. It is controlled by the ON/OFF signal from the powertrain control module (PCM) to apply line pressure to shift valve B. The signal from the PCM is output so that the line pressure is supplied to the clutch piston under the condition that overdrive clutch engagement is requested during running at 44 mph (70 km/h) or more. When the signal to shift solenoid valve B from the PCM is ON, and the line pressure is applied to shift valve B, it operates against the shift valve B spring. When the signal to shift solenoid valve B from the PCM is off, and the line pressure is discharged, shift valve B is inactive. The PCM monitors the transmission fluid pressure sensor and detects a shift solenoid valve B OFF failure and stores a DTC when the transmission fluid pressure sensor is specified pressure or less while engagement of the over drive clutch is requested.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous | |
| Sequence | None | |
| Duration | 2.1 seconds or more | |
| DTC Type | One drive cycle, MIL off, shift position indicator blinks | |
Enable Conditions
| Condition | Minimum | Maximum | |
|---|---|---|---|
| Vehicle speed [Vehicle Speed] | 44 mph (70 km/h) | - | |
| 12 volt battery voltage [Battery Voltage] | 11 V | - | |
| Over drive clutch | ON (engaged) | ||
| State of the vehicle | Engine driving mode | ||
[ ]: HDS Parameter
Malfunction Threshold
The transmission fluid pressure sensor output is specified hydraulic pressure or less for at least 2.1 seconds while engagement of the over drive clutch is requested.
Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- Shift solenoid valve B stuck off
- Valve body assembly (shift valve B stuck)
Confirmation Procedure
Operating Condition
- Enter the maintenance mode, then start the engine. Hold the engine speed [Engine Speed] at 3, 000 rpm without load (in P or N) until the radiator fan comes on.
- Drive the vehicle at a steady speed of 44 mph (70 km/h) or more for at least 10 seconds with engine drive mode.
- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.
With the HDS
None.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the shift position indicator blinks and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory. The MIL does not come on.
Conditions for clearing the DTC
The shift position indicator comes off by turning the vehicle to the OFF (LOCK) mode. The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.