Network, generic

U044A Invalid Data Received From Serial Data Gateway Module D

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U044A covers serial data gateway module D. A receiver records it when D's frames carry implausible values or violate their counter or checksum; if they stop, U0149 is the matching code. No manufacturer explains U044A publicly, but Stellantis shows which unit can hold the letter D: for the 2021 Jeep Grand Cherokee, case S2108000139 describes the driver assistance module logging U0149-00, which Stellantis words as lost contact to the security gateway, together with a brief Traffic Sign Assist message at start-up; no repair is needed and a camera module software update was announced. On such vehicles invalid data from the security gateway would therefore mainly affect assistance and display functions. As with the other gateway codes, software levels and supply are checked before hardware is replaced.

Likely causes

Receiver software (e.g. camera or assistance module) misjudges gateway data at start-up
Software or configuration of gateway D not matching the vehicle
Supply, ground or bus wiring fault at gateway D

Symptoms

  • Brief assistance unavailable message at start-up
  • Driver assistance or display functions limited

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€0–800
Time0.3–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

gateway module dcan bus wiring

Related codes

U0149U0449U0451

References: static.nhtsa.gov, gsi.ext.gm.com.