Network, generic

U0185 Lost Communication With Antenna Control Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Antenna module without power or ground
Water ingress at roof fin or rear-screen amplifier
Bus wiring or connector to the antenna unit damaged
Antenna control module faulty

Symptoms

  • Poor or no radio reception
  • Satellite, TV or GPS reception lost
  • Power antenna does not move

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–600
Time0.3–2 h

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

Parts involved

antenna modulecan bus wiring

Related codes

U0486U0184U0258

References: saabwisonline.com, en.wikipedia.org.