2007 Saturn Ion Red LineFACTORY OEM SERVICE PROCEDURE

Data Link Communication DTCS

DATA LINK COMMUNICATION DIAGNOSTIC TROUBLE CODE (DTC) LIST

DTC DEFINITION
DTC B1000 Electronic Control Unit (ECU) Performance
DTC B1001 Option Configuration Error
DTC B1004 Electronic Control Unit Identification Circuit
DTC B1009 EEPROM Checksum Mismatch
DTC C0550 Electronic Control Unit (ECU) Performance
DTC U0073 Controller Area Network (CAN) Bus Communication
DTC U0100 to U0299 Lost Communication With Engine Control
DTC U1000 and U1255 Data Link Malfunction
DTC U1001 to U1254 Lost Communications With Powertrain Multiple Control System
DTC U1300, U1301, or U1305 Class 2 Data Link
DTC U2100 Controller Area Network (CAN) Bus Communication
DTC U2105 to U2199 Lost Communications With Engine 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.

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