U19EA00: Control module for emergency call module and communication unit BAP communication error (Unauthorized)
Diagnostic trouble code U19EA00 — what it means, the common
causes, and how to confirm the real fault before replacing parts.
What does U19EA00 mean?
U19EA00 indicates: Control module for emergency call module and communication unit BAP communication error (Unauthorized).
This relates to the Network / communication system.
Common causes of U19EA00
BAP communication error between control module for emergency call module and communication unit (J949) and another control unit
unauthorized communication on the BAP protocol involving J949
Parts often involved in U19EA00
Emergency call module control unit and communication unit J949
Don't replace parts until the root cause is confirmed — many of these codes are caused by wiring, a connector or an upstream fault, not the part itself.
Get the confirmed root cause for U19EA00 — on YOUR vehicle
A code is a symptom, not a diagnosis. AutoDX Pro cross-checks several
independent assessments, pinpoints the actual root cause, gives you the
exact tests to confirm it, and shows the parts — only after the cause is
confirmed. Reads your scan-tool photo and decodes your VIN with open
recalls.
U19EA00 is a diagnostic trouble code: Control module for emergency call module and communication unit BAP communication error (Unauthorized).
What are the common causes of U19EA00?
Common causes include: BAP communication error between control module for emergency call module and communication unit (J949) and another control unit, unauthorized communication on the BAP protocol involving J949. The exact cause depends on the vehicle — confirm it before replacing parts.
Can I keep driving with U19EA00?
It depends on the fault and your symptoms. Some causes are minor, others can damage components or affect safety. Get the root cause confirmed before deciding.
How do I fix U19EA00?
Confirm the actual root cause with targeted tests first, then replace only the part that's at fault. AutoDX Pro gives you the root cause, the exact tests, and the parts for U19EA00 on your specific vehicle.