U0149Lost Communication With Gateway D
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Group of modules in one domain does not answer
- Many U-codes stored at the same time
- Functions of the cut-off domain inoperative
- Likely causes
- LikelyGateway D without power or ground
- PossibleOpen or shorted bus wiring, wet or corroded connector at gateway D
- PossibleLow battery voltage or battery disconnect (history code only)
- RareGateway D internally faulty
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.