OBD Guide
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U2122

Lost Communication With Radio Unit

U2122 is an OBD-II diagnostic trouble code meaning: Lost Communication With Radio Unit. Common causes: open or short circuit in the can bus, radio module malfunction. Estimated repair cost: $17–222.

Severity
✅ Low
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–222 (est.)

Symptoms

  • Audio system doesn't work
  • No information displayed on the multimedia screen
  • Voice control functions fail
  • Error message on the dashboard
  • Bluetooth connection problems

Causes

  • Open or short circuit in the CAN bus
  • Radio module malfunction
  • Module power problems
  • Incompatibility of non-original head unit
  • Corrosion of contacts or connectors

How to Fix

  1. Check the integrity of the CAN bus wiring
  2. Scan all modules for other errors
  3. Check the power supply and ground of the radio module
  4. Update the multimedia system firmware
  5. Restore system to factory settings

Related codes

U2100U2101U0155

FAQ

What does the U2122 code mean?

U2122 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Radio Unit

What causes a U2122 error code?

The most common causes of U2122 include: Open or short circuit in the CAN bus; Radio module malfunction; Module power problems; Incompatibility of non-original head unit.

How do I fix a U2122 diagnostic trouble code?

To fix U2122: Check the integrity of the CAN bus wiring. Scan all modules for other errors. Check the power supply and ground of the radio module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U2122?

Yes, but get it checked soon

How much does it cost to fix U2122?

The estimated repair cost for U2122 is $17–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat