U0447 code meaning
Invalid Data Received From Serial Data Gateway Module A
Network system Generic code U04xx codes Check engine light
What U0447 means
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.
U0447 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.3 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0447
- 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
Common causes of U0447
- Most 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
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Vehicle gatewayCAN bus wiring
What each part of U0447 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 47 | The exact fault in that area. |
What to do next
- Note U0447 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0447
What does U0447 mean?
U0447 means "Invalid Data Received From Serial Data Gateway Module A". As the central gateway, serial data gateway module A links the vehicle networks and forwards messages between them. It is a generic code, so it means the same on every make.
Is it safe to drive with U0447?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will U0447 fail an emissions test?
Yes, it can. U0447 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U0447 to fix?
Difficulty: workshop only. A typical repair takes 0.3 to 2.5 hours of work. This is a job for a workshop.
Will U0447 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.