Network, generic

U0149 Lost Communication With Gateway D

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

U0149 names Gateway D as the module whose messages no longer arrive. Vehicles with several gateways split the network into domains, and each gateway routes traffic between its own bus segments; losing D therefore cuts off the domain it serves. Following GM's generic U0100-U02FF logic, a receiving module stores the code when the expected periodic message with the sender's availability is missing while voltage is normal. No manufacturer documents U0149 publicly, and GM only lists U0146 for a single gateway. U0146 to U0148 cover gateways A to C, U0150 the fifth one. A history-only entry after a battery disconnect or flat battery is often harmless; an active one usually comes with many other U-codes. No MIL as a rule.

Likely causes

Gateway D without power or ground
Open or shorted bus wiring, wet or corroded connector at gateway D
Low battery voltage or battery disconnect (history code only)
Gateway D internally faulty

Symptoms

  • Group of modules in one domain does not answer
  • Many U-codes stored at the same time
  • Functions of the cut-off domain inoperative

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–1,200
Time1–4 h

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

Parts involved

gateway modulecan bus wiring

Related codes

U0146U0147U0148U0150

References: saabwisonline.com, bosch-mobility.com, saabwisonline.com.