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DTC U18B9-U18BF > < Scan Tool Does Not Communicate with High Speed GMLAN Device

Astra J

DTC U2101

Diagnostic Instructions

•  Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
•  Review Strategy Based Diagnosis for an overview of the diagnostic approach.
•  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 recognises 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


Connector End View Reference

Component Connector End Views


Description and Operation

Data Link Communications Description and Operation


Electrical Information Reference


Scan Tool References

Control Module References for scan tool information

Circuit/System Verification

1. Verify the appropriate DTC is not set.
⇒ If the DTC is set along with other codes, diagnose all other codes first. If no other codes are set, program the control module specified by the DTC descriptor.
2. With a scan tool, clear the DTCs.
3. Ignition OFF, remove the scan tool, open and close the drivers door.
4. Wait 60 seconds, then verify the DTC is not set.
⇒ If the DTC is set, replace the appropriate control module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control module replacement, setup, and programming

DTC U18B9-U18BF > < Scan Tool Does Not Communicate with High Speed GMLAN Device