2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2265
The transmission control module detects an invalid Automatic Transmission Output Shaft Speed Sensor direction.
P0722
* The transmission control module detects no signal from the Automatic Transmission Output Shaft Speed Sensor.
* The transmission output speed is less than 50 RPM for 1.5 seconds.
P0723
* The transmission control module detects an unrealistic signal drop from the Automatic Transmission Output Shaft Speed Sensor.
* Automatic Transmission Output Shaft Speed Sensor DTC P0723 has not failed this ignition.
* The transmission output speed is 1,000 RPM or greater for 6 seconds.
* The transmission output speed drops 1,300 RPM for greater than 4 seconds and does not recover.
Action Taken When the DTC Sets
P0721
The transmission control module calculates vehicle direction.
P0722 and P0723
The transmission control module calculates vehicle speed based on the wheel speed sensors.
Conditions for Clearing the DTC
* P0723 is a Type A DTC.
* P0721 and P0722 are a Type B DTC.
Diagnostic Aids
Inspect the Automatic Transmission Output Shaft Speed Sensor, harness, and connector pins for metallic debris and the hybrid direct, 2-3-4 clutch
housing assembly machined teeth for damage or misalignment. Even one bent or misaligned tooth, and or contact with the Automatic Transmission
Output Shaft Speed Sensor, may cause this DTC to set. Proper torque of 9-13 Nm (80-115 lb in) to the Automatic Transmission Output Shaft
Speed Sensor mounting bolt is critical to proper Automatic Transmission Output Shaft Speed Sensor operation. The hybrid system is very sensitive
to the Automatic Transmission Output Shaft Speed Sensor signal for overall operation.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information.
Special Tools
J 38522 Variable Signal Generator
Circuit/System Verification
1. Operate the vehicle at 16-32 km/h (10-20 mph), observe the scan tool Transmission OSS parameter. The reading should be greater than 150
RPM and not drop out.
2. Observe the scan tool OSS Supply Voltage parameter. The reading should display OK.
