2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2299
6L50/6L80/6L90 - Automatic Transmission
DTC P0776 or P0777
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0776
- Clutch Pressure Control (PC) Solenoid 2 - Stuck Off
DTC P0777
- Clutch Pressure Control (PC) Solenoid 2 - Stuck On
Circuit/System Description
The clutch pressure control (PC) solenoid 2 is part of the control solenoid valve assembly, which has no serviceable parts. The PC solenoid 2
regulates transmission fluid pressure to the 3-5-Reverse clutch regulator valve which controls pressure to the 3-5-Reverse clutch. The TCM
calculates gear ratio based on the RPM signals from the input speed sensor (ISS) and the output speed sensor (OSS). The TCM compares the
expected transmission gear ratio to the calculated gear ratio for each commanded gear.
Conditions for Running the DTC
P0776
* DTCs P0121, P0122, P0123, P0716, P0717, P0722, P0723, or P182E are not set.
* Ignition voltage is 8.6 volts or greater.
* Engine speed is 500 RPM or greater for 5 seconds.
* Transmission fluid temperature (TFT) is equal to or greater than 0掳C (32掳F).
* High side driver is enabled.
* Average driven wheel speed is 80 RPM or more.
* Side to side average wheel speed between driven and non-driven wheel is 150 RPM or less for 6 seconds.
* The transmission input shaft speed is greater than 60 RPM.
* PC solenoid 2 is commanded ON.
* 3rd or 5th gear ratio has been achieved.
P0777
* DTCs P0716, P0717, P0722, P0723, or P182E are not set.
* Transmission fluid temperature (TFT) is equal to or greater than 0掳C (32掳F).
* Ignition voltage is 8.6 volts or greater.
* Engine speed is 500 RPM or greater for 5 seconds.
* High side driver is enabled.
* The transmission input and output shaft speed is greater than 200 RPM.
* PC solenoid 2 is commanded OFF.
Conditions for Setting the DTC
P0776
The TCM detects an incorrect on-coming clutch gear ratio, or flare, when the 3-5-R clutch is commanded ON for 2.25 seconds and the transmission
input shaft speed is 60-100 RPM or greater from the anticipated input shaft speed.
P0777
The TCM detects an incorrect off-going clutch gear ratio, or tie-up, when the 3-5-R clutch is commanded OFF for 1.2 seconds and the transmission
input shaft speed is 40 RPM or less from the anticipated input shaft speed.
Action Taken When the DTC Sets
* DTCs P0776 and P0777 are Type A DTCs.
* The TCM commands maximum line pressure.
* The TCM inhibits TCC.
