2009 Pontiac G8 BaseFACTORY OEM SERVICE PROCEDURE

Diagnostic Code Index

DIAGNOSTIC CODE INDEX

DTC Description
DTC B1000  B1000 XX: Electronic Control Unit
DTC B1001  B1001 XX: Option Configuration
DTC B1016  B1016: Vehicle Identification Number Not Programmed
DTC C0550  C0550 XX: Electronic Control Unit
DTC U0020  U0020 00: Low Speed CAN Communication Bus Performance
DTC U0073 or U2100  U0073 00: Control Module Communication Bus Off
U0073 71: ECU HS Bus Off
U0073 72: ECU LS Bus Off
U2100 00: Controller Area Network (CAN) Bus Communication
U2100 47: Controller Area Network (CAN) Bus Communication
DTC U0100-U0299  Loss Of Serial Data Communications With A Module
DTC U1814  U1814 00: Powertrain High Speed Communication Enable Circuit
DTC U2099  U2099 00: High Speed Communication Enable Circuit
Factory Service Tools

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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.

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