U0447Invalid Data Received From Serial Data Gateway Module A
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- As the central gateway, serial data gateway module A links the vehicle networks and forwards messages between them. U0447 means a receiver gets gateway frames with failed protection; for lost contact the code is U0146. In GM's 2025 tables, many receiving modules run this test: the ECM checks rolling count, protection value and checksum of backup power mode signals, a Type B code (two trips) follows after 3 bad samples out of 10, the TCM uses Type A; camera and radar modules allow 0.625 s, stay non-MIL and drop adaptive cruise. GM bulletin 23-NA-206 lists U0447 among history codes to ignore. Audi bulletin 2069299 for 2022-24 Q4 e-tron finds U044700 in both brake modules while the engine module reports U014600, and replaces gateway J533. VW reports it in the ECM of 2013-19 Golf models.
- What you may notice
- Several warning messages in the instrument cluster at once
- Adaptive cruise or camera-based assistance unavailable
- Check engine light on in vehicles that rate the fault as MIL-relevant
- Likely causes
- LikelyGateway hardware or software fault, update or replacement of the gateway
- PossibleReceiver software logs the code without a real fault (history entry)
- PossibleLow battery voltage or poor ground at the gateway during wake-up or power mode changes
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €60 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.