U014600 on Volkswagen: Lost Communication With Serial Data Gateway Module "A"
Diagnostic trouble code U014600 on Volkswagen vehicles — what it means, the common
causes, and how to confirm the real fault before replacing parts.
What does U014600 mean?
U014600 indicates: Lost Communication With Serial Data Gateway Module "A".
This relates to the Network / communication system.
Common causes of U014600
Interruption of the data bus cable/wiring
Faulty voltage supply of the gateway/transmitter or receiver control module
Faulty gateway control module (transmitter or receiver)
Control module disconnected from the bus at least twice (bus OFF condition)
Message time-out caused by at least 10 consecutive messages not received
Fatal errors detected in the affected control module causing it to disconnect from the bus
What to check (live data)
Gateway measuring value blocks (accessible via VAS scan tools, Address Word 19 on later models, or Address Word 17 on earlier models)
CAN bus continuity check using ohmmeter (Drivetrain CAN)
CAN-high signal at DLC Pin 6 (Diagnosis CAN high)
CAN-low signal at DLC Pin 14 (Diagnosis CAN low)
DSO function on VAS 5051 for Convenience/Infotainment CAN bus signals
Parts often involved in U014600
Serial Data Gateway Module / Data Bus On Board Diagnostic Interface J533
CAN bus wiring/cables
Gateway control module
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 U014600 — 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.
U014600 is a diagnostic trouble code: Lost Communication With Serial Data Gateway Module "A".
What are the common causes of U014600 on a Volkswagen?
Common causes include: Interruption of the data bus cable/wiring, Faulty voltage supply of the gateway/transmitter or receiver control module, Faulty gateway control module (transmitter or receiver), Control module disconnected from the bus at least twice (bus OFF condition). The exact cause depends on the vehicle — confirm it before replacing parts.
Can I keep driving a Volkswagen with U014600?
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 U014600 on a Volkswagen?
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 U014600 on your specific Volkswagen.