2010 Cadillac CTS Sedan AWD V6-3.0L Page 1722
DTC Descriptors
DTC P0973
- Shift Solenoid (SS) 1 Control Circuit Low Voltage
DTC P0974
- Shift Solenoid (SS) 1 Control Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The shift solenoid (SS) 1 is part of the control solenoid valve assembly which has no serviceable parts. SS 1 is a normally closed (NC) ON/OFF
solenoid and is controlled by the TCM through a low side driver. When the SS 1 is energized (ON), SS 1 fluid pressure is directed to the clutch
select valve 2. Power to the SS 1 is supplied by the TCM through a high side driver (HSD). The HSD protects the circuit and components from
excessive current flow. If excessive current flow is detected, the HSD will turn OFF. When the fault is corrected, the HSD will reset.
Conditions for Running the DTC
P0973 or P0974
* DTCs P0973 or P0974 have not set this ignition.
* The ignition voltage is 8.6 volts or greater.
* The engine speed is 500 RPM or greater for 5 seconds.
Conditions for Setting the DTC
P0973
The control solenoid valve assembly detects an internal low voltage electrical malfunction of the SS 1 control circuit when the SS 1 is commanded
OFF for 2 seconds.
P0974
The control solenoid valve assembly detects an internal high voltage electrical malfunction of the SS 1 control circuit when the SS 1 is commanded
ON for 2 seconds.
Action Taken When the DTC Sets
P0973
* DTC P0973 is a Type A DTC.
* The TCM defaults the transmission to 2nd gear or reverse gear.
* The TCM forces the torque converter clutch (TCC) OFF.
* The TCM commands maximum line pressure.
* The TCM freezes transmission adaptive functions.
* The TCM enables Torque Management.
* The TCM inhibits TAP function.
* The TCM inhibits manual shifting of forward gears.
P0974
* DTC P0974 is a Type B DTC.
* The TCM inhibits 1st gear.
