Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2007 Saturn Relay 3.9 1FACTORY 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 B1007 | EEPROM Read/Write Error |
| DTC B1009 | EEPROM Checksum Mismatch |
| DTC B1013 | Calibration Read Only Memory (ROM) Checksum Error |
| DTC B1327 | Device Power Circuit Low |
| DTC B1328 | Device Power Circuit High |
| DTC C0550 | Electronic Control Unit (ECU) Performance |
| DTC U0073 | The module setting the DTC has attempted to establish communications on the GMLAN circuits for more than 7 times. |
| DTC U0100 to U0299 or U2105 to U2199 | Lost Communication With Control Module |
| DTC U1000 and U1255 | Class 2 Data Link Malfunction/Lost Communications |
| DTC U1001 to U1254 | Lost communication With XXX Module (See Table Under DTC U1001-U1254 Testing) |
| DTC U1300, U1301, or U1305 | Class 2 Data Link Low/High |
| DTC U2100 | Controller Area Network (CAN) Bus Communication |
Factory Service Tools
Use the Manual With the Right Hardware
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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.