LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2012 >> Verano >> Repair and Diagnosis >> Engine Performance >> System >> Data Communications System >> Diagnostic Information and Procedures >> Diagnostic Code Index
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Code Index

DIAGNOSTIC CODE INDEX

DTC Description
Control Module U Code List  Control Module U Code List 
DTC B1000  DTC B1000 00 Electronic Control Unit Malfunction
DTC B1000 08 Electronic Control Unit Performance - Signal Invalid
DTC B1000 0F Electronic Control Unit Signal Erratic
DTC B1000 12 Electronic Control Unit Low Input
DTC B1000 2B Electronic Control Unit Missing Reference
DTC B1000 34 Electronic Control Unit RAM Malfunction
DTC B1000 35 Electronic Control Unit ROM Malfunction
DTC B1000 36 Electronic Control Unit EEPROM Performance/Malfunction
DTC B1000 37 Electronic Control Unit Software Malfunction
DTC B1000 38 Electronic Control Unit Supervision Software Malfunction
DTC B1000 39 Electronic Control Unit Internal Malfunction
DTC B1000 43 Electronic Control Unit EEPROM Incorrect Programming
DTC B1000 46 Electronic Control Unit Configuration Not Programmed
DTC B1000 4A Electronic Control Unit Programming Checksum Error
DTC B1000 56 Electronic Control Unit Too Many Transitions
DTC B1000 73 Electronic Control Unit Parity Error
DTC B1000 F0 Electronic Control Unit
DTC B1000 F1 Electronic Control Unit
DTC B1000 F2 Electronic Control Unit
DTC B1000 F3 Electronic Control Unit
DTC B1001  DTC B1001 00 Option Configuration Malfunction
DTC B1001 33 Option Configuration Special Memory Malfunction
DTC B1001 45 Option Configuration Variant Not Programmed
DTC B1001 4B Option Configuration Calibration Not Learned
DTC B101D  DTC B101D 00 Electronic Control Unit Hardware Malfunction
DTC B101D 04 Electronic Control Unit Hardware Open
DTC B101D 08 Electronic Control Unit Hardware Performance - Signal Invalid
DTC B101D 0F Electronic Control Unit Hardware Signal Erratic
DTC B101D 12 Electronic Control Unit Hardware Low Input
DTC B101D 13 Electronic Control Unit Hardware Low Voltage/High Temperature
DTC B101D 14 Electronic Control Unit Hardware High Voltage/Low Temperature
DTC B101D 1A Electronic Control Unit Hardware Performance - Bias Level Out of Range
DTC B101D 2B Electronic Control Unit Hardware Missing Reference
DTC B101D 2C Electronic Control Unit Hardware
DTC B101D 31 Electronic Control Unit Hardware Internal Checksum Error
DTC B101D 32 Electronic Control Unit Hardware General Memory Malfunction
DTC B101D 34 Electronic Control Unit Hardware RAM Malfunction
DTC B101D 35 Electronic Control Unit Hardware ROM Malfunction
DTC B101D 36 Electronic Control Unit Hardware EEPROM Performance/Malfunction
DTC B101D 37 Electronic Control Unit Hardware Software Malfunction
DTC B101D 38 Electronic Control Unit Hardware Supervision Software Malfunction
DTC B101D 39 Electronic Control Unit Hardware Internal Malfunction
DTC B101D 3A Electronic Control Unit Hardware Incorrect Component Installed
DTC B101D 3B Electronic Control Unit Hardware Self-Test Malfunction
DTC B101D 3C Electronic Control Unit Hardware Internal Communication Malfunction
DTC B101D 43 Electronic Control Unit Hardware EEPROM Incorrect Programming
DTC B101D 73 Electronic Control Unit Hardware Parity Error
DTC B101D F0 Electronic Control Unit Hardware
DTC B101D F1 Electronic Control Unit Hardware
DTC B101E  DTC B101E 00 Electronic Control Unit Software Malfunction
DTC B101E 31 Electronic Control Unit Software Internal Checksum Error
DTC B101E 32 Electronic Control Unit Software General Memory Malfunction
DTC B101E 41 Electronic Control Unit Software Not Programmed
DTC B101E 42 Electronic Control Unit Software Calibration Not Programmed
DTC B101E 43 Electronic Control Unit Software EEPROM Incorrect Programming
DTC B101E 44 Electronic Control Unit Software Security Access Not Activated
DTC B101E 45 Electronic Control Unit Software Variant Not Programmed
DTC B101E 46 Electronic Control Unit Software Configuration Not Programmed
DTC B101E 47 Electronic Control Unit Software VIN Not Programmed
DTC B101E 48 Electronic Control Unit Software Security Code Not Programmed
DTC B101E 4A Electronic Control Unit Software Programming Checksum Error
DTC B101E 4B Electronic Control Unit Software Calibration Not Learned
DTC B101E 4C Electronic Control Unit Software DTC Memory Full
DTC C0550  DTC C0550 00 Electronic Control Unit Malfunction
DTC C0550 35 Electronic Control Unit ROM Malfunction
DTC C0550 39 Electronic Control Unit Internal Malfunction
DTC C0550 43 Electronic Control Unit EEPROM Incorrect Programming
DTC C056D  DTC C056D 00 Electronic Control Unit Hardware Malfunction
DTC C056D 0F Electronic Control Unit Hardware Signal Erratic
DTC C056D 18 Electronic Control Unit Hardware Low Signal Amplitude
DTC C056D 31 Electronic Control Unit Hardware Internal Checksum Error
DTC C056D 32 Electronic Control Unit Hardware General Memory Malfunction
DTC C056D 33 Electronic Control Unit Hardware Special Memory Malfunction
DTC C056D 34 Electronic Control Unit Hardware RAM Malfunction
DTC C056D 35 Electronic Control Unit Hardware ROM Malfunction
DTC C056D 36 Electronic Control Unit Hardware EEPROM Performance/Malfunction
DTC C056D 37 Electronic Control Unit Hardware Software Malfunction
DTC C056D 39 Electronic Control Unit Hardware Internal Malfunction
DTC C056D 3A Electronic Control Unit Hardware Incorrect Component Installed
DTC C056D 3B Electronic Control Unit Hardware Self-Test Malfunction
DTC C056D 3C Electronic Control Unit Hardware Internal Communication Malfunction
DTC C056D 43 Electronic Control Unit Hardware EEPROM Incorrect Programming
DTC C056E  DTC C056E 00 Electronic Control Unit Software Malfunction
DTC C056E 38 Electronic Control Unit Software Supervision Software Malfunction
DTC C056E 41 Electronic Control Unit Software Not Programmed
DTC C056E 42 Electronic Control Unit Software Calibration Not Programmed
DTC C056E 43 Electronic Control Unit Software EEPROM Incorrect Programming
DTC C056E 45 Electronic Control Unit Software Variant Not Programmed
DTC C056E 46 Electronic Control Unit Software Configuration Not Programmed
DTC C056E 47 Electronic Control Unit Software VIN Not Programmed
DTC C056E 48 Electronic Control Unit Software Security Code Not Programmed
DTC C056E 4A Electronic Control Unit Software Programming Checksum Error
DTC C056E 4B Electronic Control Unit Software Calibration Not Learned
DTC C056E 5A Electronic Control Unit Software Not Plausible
DTC C056E 71 Electronic Control Unit Software Invalid Data
DTC C078A  DTC C078A 39 Tire Pressure Indicator Module Internal Malfunction
DTC P0601-P0604, P0606, or P062F  DTC P0601 00 Control Module Read Only Memory Performance Malfunction
DTC P0602 00 Control Module Not Programmed Malfunction
DTC P0603 00 Control Module Long Term Memory Reset Malfunction
DTC P0604 00 Control Module Random Access Memory Performance Malfunction
DTC P0606 00 Control Module Processor Performance Malfunction
DTC P062F 00 Control Module Long Term Memory Performance Malfunction
DTC U0001  DTC U0001 00 High Speed CAN Communication Bus Malfunction
DTC U0002  DTC U0002 High Speed CAN Bus Malfunction
DTC U0020  DTC U0020 00 Low Speed CAN Communication Bus Performance Malfunction
DTC U0073 or U2100  DTC U0073 00 Control Module Communication Bus Off Malfunction
DTC U0073 71 ECU High Speed Bus Off
DTC U0073 72 ECU Low Speed Bus Off
DTC U2100 00 CAN Bus Communication Malfunction
DTC U2100 47 CAN Bus Communication VIN Not Programmed
DTC U0074  DTC U0074 00 Control Module Communication Bus B Off Malfunction
DTC U0078  DTC U0078 00 Control Module Low Speed Communication Bus Off Malfunction
DTC U0100-U02FF  Control Module U Code List 
DTC U0300-U0336  DTC U0301 00 Software Incompatibility with Engine Control Module Malfunction
DTC U0302 00 Software Incompatibility with Transmission Control Module Malfunction
DTC U0315 00 Software Incompatibility with Electronic Brake Control Module Malfunction
DTC U0400-U05FF  Control Module U Code List 
DTC U1500-U15BF  Control Module U Code List 
DTC U1814  DTC U1814 00 Powertrain Wake Up Communication Circuit Malfunction
DTC U1814 02 Powertrain Wake Up Communication Circuit Short to Ground
DTC U1814 5A Powertrain Wake Up Communication Circuit Not Plausible
DTC U18B9-U18BF  DTC U18B9 00 Primary High Speed CAN Bus Subnet Configuration List Malfunction
DTC U18BF 00 Secondary High Speed CAN Bus Subnet Configuration List Malfunction
DTC U2099  DTC U2099 00 High Speed Communication Enable Circuit Malfunction
DTC U2099 01 High Speed Communication Enable Circuit Short to Battery
DTC U2099 02 High Speed Communication Enable Circuit Short to Ground
DTC U2099 04 High Speed Communication Enable Circuit Open
DTC U2099 5A High Speed Communication Enable Circuit Not Plausible
DTC U2101  DTC U2101 00 CAN Bus Maximum Configuration List Malfunction
DTC U2103  DTC U2103 00 Fewer Controllers On Bus Than Programmed Malfunction
DTC U2105-U2199  Control Module U Code List