U0185: Lost Communication with Antenna Control Module
Standardized SAE J2012 code · U01xx — Lost communication with modules
What does U0185 mean?
The infotainment system has lost the antenna / tuner amplifier controller. Radio reception drops, navigation may lose GPS, and connected services can fail.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Common causes
- High Antenna module unpowered
- Low Gateway module routing CAN messages incorrectly
- Low CAN terminating resistor (120 Ω) drifted out of spec
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of U0185 on the same make and model first.
U0185 in the community
Ask about U0185No one has posted about U0185 yet
Share your vehicle, the tool you used and what you tested — the first thread helps everyone who searches for this code.
Describe your U0185 problem