2010 Cadillac Truck SRX FWD V6-3.0L Page 2117
Circuit/System Description
The shift control solenoid (SLB1) is installed on the front valve body. The solenoid linearly controls hydraulic pressure in response to signals
output from the transmission control module TCM. Through this, the SLB1 controls operating hydraulic pressure to the brake 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
P2725
* The ignition voltage is 10.2-15.5 V.
* The engine speed is greater than 400 RPM for 2 s.
* The transmission is not in emergency mode.
* Driving in D range.
* TCM communication is normal.
* DTCs P2729 and P2730 are not set.
P2728
* The ignition voltage is 10.2-15.5 V.
* The engine speed is greater than 400 RPM for 2 s.
* The transmission is not in emergency mode.
* Driving in D range.
* TCM communication is normal.
* The automatic transmission fluid temperature is more than 20掳C (68掳F).
* SLB1 current is more than 0.85 A.
* SLB1 current is not changed.
P2729
* The ignition voltage is 10.2-15.5 V.
* The engine speed is greater than 400 RPM for 2 s.
* The transmission is not in emergency mode.
* Driving in D range.
* TCM communication is normal.
* DTC P2730 is not set.
P2730
* The ignition voltage is 10.2-15.5 V.
* The engine speed is greater than 400 RPM for 2 s.
* The transmission is not in emergency mode.
* Driving in D range.
* TCM communication is normal.
* DTC P2729 is not set.
Conditions for Setting the DTC
P2725
Deviation between commanded current and feedback current.
P2728
The TCM detects the error current more than 80 mA for 2.75 ms.
P2729
The TCM detects at least 5 times less than 23 mA current consumption of the SLB1 control circuit for 100 ms.
P2730
The TCM detects at least 5 times more than 1.333 A current consumption of the SLB1 control circuit for 100 ms.
Action Taken When the DTC Sets
P2725, P2728
* DTC P2725 and P2728 are Type B DTC.
* The TCM turns OFF all solenoids.
* The TCM allows the vehicle to operate only in the second gear and "R" range after a stop.
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