OBD Guide
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U1128

Lost Communications With Radio

U1128 is an OBD-II diagnostic trouble code meaning: Lost Communications With Radio. Common causes: head unit malfunction, wiring harness damage. Estimated repair cost: $17–167.

Severity
✅ Low
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–167 (est.)

Symptoms

  • Standard audio system does not work
  • No sound from speakers
  • Bluetooth connection problems
  • Reset radio settings
  • Media display error

Causes

  • Head unit malfunction
  • Wiring harness damage
  • Problems with the CAN bus
  • Software glitches
  • Blown fuse

How to Fix

  1. Check audio system fuses
  2. Diagnose the head unit
  3. Check wiring integrity
  4. Scan the CAN bus for errors
  5. Update multimedia software

Related codes

U1129U1130U1127

FAQ

What does the U1128 code mean?

U1128 is an OBD-II diagnostic trouble code that indicates: Lost Communications With Radio

What causes a U1128 error code?

The most common causes of U1128 include: Head unit malfunction; Wiring harness damage; Problems with the CAN bus; Software glitches.

How do I fix a U1128 diagnostic trouble code?

To fix U1128: Check audio system fuses. Diagnose the head unit. Check wiring integrity. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1128?

Yes, but get it checked soon

How much does it cost to fix U1128?

The estimated repair cost for U1128 is $17–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat