U0147 code meaning
Lost Communication With Serial Data Gateway Module B
What U0147 means
U0147 points to a second gateway, B. Large vehicle networks often use more than one routing node, for example a central gateway plus a separate unit that connects the car to the outside world. That is how FCA uses the code: in a field report on a 2014 Jeep Grand Cherokee, filed with NHTSA in investigation PE15-021, U0147 is listed as lost communication with the telematics gateway, next to an open circuit on cellular antenna 1 and U0184 for the radio. On such vehicles the code therefore concerns connected services such as emergency call or remote functions rather than driving. Other makers do not document U0147 publicly. A routing module of this kind filters and forwards messages between domains, as Bosch describes for its central gateways. U0146 and U0148 to U0150 cover gateways A and C to E, U0448 invalid data from B.
U0147 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0147
- Connected services, emergency call or remote app functions unavailable
- Modules behind gateway B not reachable with a scan tool
- Further codes such as radio communication or antenna faults
Common causes of U0147
- Most likelyPower, fuse or ground of gateway B missing
- PossibleBus wiring or connector to gateway B faulty
- PossibleTelematics unit acting as gateway B faulty or in a fault state (FCA)
- Less likelyGateway B software hangs after an update or voltage dip
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Gateway moduleCAN bus wiring
What each part of U0147 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 U0147 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 U0147
What does U0147 mean?
U0147 means "Lost Communication With Serial Data Gateway Module B". U0147 points to a second gateway, B. It is a generic code, so it means the same on every make.
Is it safe to drive with U0147?
U0147 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0147 fail an emissions test?
U0147 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U0147 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U0147 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.