2010 Cadillac Truck SRX FWD V6-3.0L Page 2178
* The control module uses default values for all parameters received on the serial data circuits.
* In the TCM, DTC U0073 will cause the transmission to go into default gears.
* In the ECM and TCM, DTC U0073 will cause the malfunction indicator lamp (MIL) to illuminate.
* The control module inhibits the setting of all other communication DTCs.
Conditions for Clearing the DTC
* The ECM/TCM modules turn OFF the MIL after 4 consecutive ignition cycles that the diagnostic runs and does not fail.
* A current DTC clears when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.
Circuit/System Verification
1. Refer to Data Link References (See: Powertrain Management/Computers and Control Systems/Information Bus/Testing and
Inspection/Initial Inspection and Diagnostic Overview) to determine which serial data system is used for a specific control module.
2. This DTC cannot be retrieved with a current status. Diagnosis is accomplished using the symptom. Refer to Symptoms - Data
Communications (See: Powertrain Management/Computers and Control Systems/Information Bus/Testing and Inspection/Symptom Related
Diagnostic Procedures/Symptoms - Data Communications).
U2101
DTC U2101
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 Descriptor
DTC U2101
- CAN Bus Maximum Configuration List
Circuit/System Description
Some control modules must be programmed with software that specifically identifies the correct type and quantity of modules on the serial data bus
based on RPO configuration. If a control module was not properly configured after installation, the appropriate U Code may be set for that module.
No external circuit diagnosis is involved.
Conditions for Running the DTC
* Voltage supplied to the module is in the normal operating voltage range.
* The vehicle power mode requires serial data communication to occur.
Conditions for Setting the DTC
* The control module is not configured properly.
* Control unit recognizes a programming error.
* CAN-Bus configuration is invalid
Conditions for Clearing the DTC
* A current DTC clears when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.
Reference Information
Schematic Reference
Data Communication Schematics (See: Powertrain Management/Computers and Control Systems/Information Bus/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Data Link Communications Description and Operation (See: Powertrain Management/Computers and Control Systems/Information
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