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.
DTC C1298: Pcm Class 2 Serial Data Link Malfunction
2000 Buick Century CustomSECTION DTC C1298: Pcm Class 2 Serial Data Link Malfunction
- Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under DIAGNOSIS & TESTING. After performing diagnostic system check, go to next step.
- Using scan tool, read the IPC DTC(s). If DTC U1040 is set as current, diagnose affected DTC. If DTC U1040 is not set, go to next step.
- Replace EBCM. After replacing EBCM, go to next step.
- Using scan tool, clear DTCs. Turn ignition on. Recheck DTCs. If DTC resets, go to step 2 . If DTC does not reset, system is okay.
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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.