OBD-II Code · Network

U0184

Lost Communication with Radio

Severity

low

Lowest on our scale. Fix it when convenient.

Can you drive it

Only if running normally

A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety.

Indicative cost (USD)

$100–$800

Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.

Radio module comm lost.

How a shop works this

Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.

Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.

If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.

Common symptoms

Radio off
Clock wrong

Likely causes

Failed radioMost common
Wiring

Read the full diagnostic procedureU0184 is loss of communication with the radio/audio control module, which on modern vehicles is more serious than it sounds because the head unit oft…+

U0184 is loss of communication with the radio/audio control module, which on modern vehicles is more serious than it sounds because the head unit often hosts telematics, hands-free phone, navigation, and on some platforms acts as a secondary CAN gateway for the infotainment bus (MOST, Ethernet AVB, or low-speed CAN).

Cheapest-first

check the radio fuse(s) (usually two: constant 12V for memory and switched accessory for power-on) and confirm voltage at the radio connector.
Verify ground at the radio chassis.
If the radio is dead and not just off-bus, the U0184 is a symptom not a cause.
If the radio powers on but doesn't communicate, scope CAN-H/CAN-L (or MOST optical signal on BMW/Mercedes/Audi) at the radio connector.
Aftermarket radios with poorly designed CAN interface modules (Maestro, iDatalink, Axxess) cause U0184 storms when their firmware doesn't handshake correctly with the factory gateway.
Caveat: many 2008+ factory radios are VIN-locked or anti-theft coded, so a used unit without the correct PIN/anti-theft reset will throw U0184 and refuse to function regardless of bus health.

Vehicle-specific patterns2007-2013 Chrysler/Dodge/Jeep with MyGIG (REN/RHR/RBZ) radios suffer internal CD-mech failures and HDD failures that take the radio off-bus, setting…+

2007-2013Chrysler/Dodge/Jeep with MyGIG (REN/RHR/RBZ) radios suffer internal CD-mech failures and HDD failures that take the radio off-bus, setting U0184; iDataLink-style aftermarket replacements often require dealer-level programming.
2010-2017GM with MyLink/IntelliLink sees U0184 from radio firmware corruption after low-battery events.
2011-2014Ford with MyFord Touch (SYNC 2) is the U0184 textbook case; APIM (Accessory Protocol Interface Module) replacements and firmware reflashes are the fix, covered by Ford's CSP 14M02 on some VINs.
2007-2013BMW E90 with CIC head unit sees U0184-equivalent from MOST bus fiber optic damage at the trunk harness.

Estimated repair$80 to $2400.

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U0184 — frequently asked

What does a U0184 code mean?

Radio module comm lost.

What causes a U0184 code?

Common causes: Failed radio; Wiring.

What are the symptoms of a U0184 code?

Typical symptoms: Radio off; Clock wrong.

Is it safe to drive with a U0184 code?

Only if running normally. A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety. Estimated repair: $100-$800.

How do I diagnose a U0184 code?

Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.

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