U0185Lost Communication With Antenna Control Module
- Generic OBD-II code · Network
- How the car detects it
- U0185 indicates that the antenna control module has stopped communicating. This unit, frequently an amplifier or tuner box near the rear screen, the roof fin or a bumper, conditions radio, TV, satellite or GPS signals and in some designs raises or lowers a motorised mast. U0185 has no public manufacturer documentation; neither the GM list nor the NHTSA bulletin index uses it. The listening module, typically the radio, logs it when the antenna unit's periodic message disappears; GM names 9-16 V as the precondition for this whole class of codes. Reception becomes weak or drops out and a power mast may stay where it is. There is no effect on driving and no MIL. U0184 is the radio, U0486 invalid antenna data.
- What you may notice
- Poor or no radio reception
- Satellite, TV or GPS reception lost
- Power antenna does not move
- Likely causes
- LikelyAntenna module without power or ground
- PossibleWater ingress at roof fin or rear-screen amplifier
- PossibleBus wiring or connector to the antenna unit damaged
- RareAntenna control module faulty
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.