P1734 (82) - 2C Pressure Switch Circuit

Name of Code:
P1734 (82) - 2C Pressure Switch Circuit

When Monitored:
Whenever the engine is running.

Normal Pressure Switch States:

Set Condition:
The appropriate code is set if one of the pressure switches are open or closed at the wrong time in a given gear (see image).

Theory of Operation:
The Transmission system uses five pressure switches to monitor the fluid pressure in the LR, 2C, 4C, UD, and OD clutch circuits. The pressure switches are continuously monitored for the correct states in each gear as shown below.
- Normal Pressure Switch States
- Pressure Switch Gear
- OP switch is open (No Pressure)
- CL switch is closed (Pressure Indicated)

Transmission Effects:
The MIL will illuminate and the transmission system will default to the Immediate shutdown routine.

Possible Causes:
- If code P1791 (35) is present, perform code P1791 (35) diagnostic procedures
- Pressure switch sense circuit open or shorted to ground between TCM and solenoid/TRS assembly
- Pressure switch sense circuit shorted to battery
- Pressure switch
- Loose valve body bolts
- Plugged filter - internal transmission or torque converter failure
- Ball check not seating.
- Solenoid malfunction (If set with corresponding Solenoid DTC. I.e.: 2C Pressure switch set with 2C solenoid)
- Oil Pump (Code P1784 (81) only)
- TCM