Sunday, December 22, 2019

2010 Cadillac Truck Escalade AWD V8-6.2L Page 2504

DTC P0976 or P0977

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 P0976

- Shift Solenoid (SS) 2 Control Circuit Low Voltage

DTC P0977

- Shift Solenoid (SS) 2 Control Circuit High Voltage

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The shift solenoid (SS) 2 is part of the control solenoid valve assembly which has no serviceable parts. SS 2 is a normally closed (NC) ON/OFF

solenoid and is controlled by the TCM through a low side driver. When the SS 2 is energized (ON), SS 2 fluid pressure is directed to the clutch

select valve 3. Power to the SS 2 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

P0976 or P0977

* DTCs P0976 or P0977 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.

* The SS 2 is commanded ON or OFF.

Conditions for Setting the DTC

P0976

The TCM detects an internal low voltage electrical malfunction of the SS 2 control circuit when the SS 2 is commanded OFF for 2 seconds.

P0977

The TCM detects an internal high voltage electrical malfunction of the SS 2 control circuit when the SS 2 is commanded ON for 2 seconds.

Action Taken When the DTC Sets

P0976

* DTC P0976 is a Type A DTC.

* The TCM defaults the transmission to 3rd gear or reverse gear.

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