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.
2001 Cadillac CateraFACTORY OEM SERVICE PROCEDURE
Data Link Communications DTCS
DATA LINK COMMUNICATIONS DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC U1000 and DTC U1255 | Class 2 Communication Malfunction |
| DTC U1001 To U1254 | Lost Communication with Module (DTCS U1064, U1128, U1129) |
| DTC U1300 | Class 2 Short to Ground |
| DTC U1301 | Class 2 Short to Battery |
| DTC U2100 | CAN-BUS Communication Malfunction |
| DTC U2103 | Fewer Controllers On Bus Than Programmed |
| DTC U2104 | CAN Bus Reset Counter Overrun |
| DTC U2105, U2106 & U 2108 | Lost Communication With Control Module |
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.