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 Descriptor
- DTC U18AF
-
Lost Communications With Telematics Communications Interface Control Module on Ethernet Bus
- DTC U18B0
-
Lost Communications With Instrument Cluster on Ethernet Bus
- DTC U18B1
-
Lost Communications With Audio Amplifier on Ethernet Bus
- DTC U18B2
-
Lost Communication with Rear Audio Control Module on Ethernet Bus
- DTC U18B3
-
Lost Communications With Navigation Control Module on Ethernet Bus
- DTC U18B4
-
Lost Communication with Radio on Ethernet Bus
For symptom byte information, refer to Symptom Byte List .
NO RELATED
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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.