2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1642
DTC Descriptor
DTC P0780
- Incorrect Shift Pattern
Diagnostic Fault Information
Circuit/System Description
The shift control solenoid assembly (SLC1, SLC2, SLC3, SLB1) and the line pressure control solenoid (SLT) are installed on the front valve body.
The solenoids linearly control hydraulic pressure in response to signals output from the transmission control module (TCM). SLC1, SLC2, SLC3,
SLB1 controls hydraulic pressure to the clutches (C1, C2, C3) and brake (B1) for smooth shifting. According to each shift control solenoid
assembly, the transmission shifts from 1st gear into 6th gear and vice versa. As a fail-safe function, if any shift control solenoid assembly
abnormality occurs, the TCM will disable the current to the solenoids.
Conditions for Running the DTC
* The ignition voltage is 10.2-15.5 V.
* The engine speed is greater than 500 RPM for 2 s.
* The transmission is not in emergency mode.
* TCM communication is normal.
* Transmission fluid temperature is higher than 65掳C (149掳F).
* DTCs P0716. P0717, P0721 and P0722 are not set.
Conditions for Setting the DTC
* Driving in D range.
* Output speed is greater than 300 RPM.
* After 10 times of unusual shifting, long time shifting or rapid shifting
Action Taken When the DTC Sets
* DTC P0780 is a Type C DTC
* Torque limitation in "D" range 150 Nm (110 lb ft), in "R" range 170 Nm (125 lb ft).
* The TCM freezes transmission adaptive functions.
* The TCM turns OFF all solenoids.
* The TCM allows the vehicle to operate only in second gear and "R" range after a stop.
Conditions for Clearing the DTC
DTC P0780 is a Type C DTC.
Diagnostic Aids
Ensure the transmission fluid level, color and odor is correct and there are no leaks. If there are any other transmission DTCs set, diagnose those
