2009 Buick Allure CXLFACTORY OEM SERVICE PROCEDURE

Diagnostic Code Index

DIAGNOSTIC CODE INDEX

DTC Description
DTC B1000  Control Module Internal Fault
DTC B1001  B1001: Option Configuration Error
DTC B1009  B1009: EEPROM Checksum Mismatch/Error
DTC B1013  B1013: Calibration Read Only Memory (ROM) Checksum Error
DTC B1014  B1014: Program Read Only Memory (ROM) Checksum Error
DTC B1390  B1390: Device Voltage Reference Input Circuit
DTC C0550  C0550: ECU Malfunction
DTC U0001  High Speed CAN Communication Bus
DTC U0100-U0299  Transmitter Module Availability Communication Error
DTC U1000 and U1255  U1000: Class 2 Data Link
U1255: Loss of Class 2 Communication
DTC U1001-U1254  Module Communication Error
DTC U1300, U1301, or U1305  U1300: Class 2 Data Link Low
U1301: Class 2 Data Link High
U1305: Class 2 Data Link High or Low
DTC U2100  U2100: Controller Area Network (CAN) Bus Communication
DTC U2105-U2199  U2105: Lost Communications With Engine Control System
U2107: Lost Communications With Body Control System
U2108: Lost Communications With ABS/TCS Control System
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.