OBD-II code · Network
U044A Invalid Data Received From Serial Data Gateway Module D
A receiving module detected implausible data from serial data gateway D. Bridged messages between sub-buses (CAN/LIN/FlexRay/Ethernet) fail plausibility checks and are rejected.
Is it safe to drive with U044A?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyModule internal fault or sensor input drift
- PossibleSoftware version mismatch after replacement
- Less likelyGateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Gateway Module D
Related codes
- U0449Invalid Data Received From Serial Data Gateway Module C
- U0451Invalid Data Received From Serial Data Gateway Module E
- U0447Invalid Data Received from Gateway A
- U0448Invalid Data Received from Gateway B
- U044BInvalid Data Received From Battery Energy Control Module C
- U044CInvalid Data Received From Hybrid/EV Battery Inductive Charging Module
- U044DInvalid Data Received From Generator B Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.