OBD Guide
ENFRDEESPT

B2128

UART Communication

B2128 is an OBD-II diagnostic trouble code meaning: UART Communication. Common causes: broken or damaged wiring harness, corrosion of contacts in connectors. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Check Engine Light Is On
  • Certain systems do not work (for example, airbags)
  • Intermittent electronic malfunctions

Causes

  • Broken or damaged wiring harness
  • Corrosion of contacts in connectors
  • Malfunction of one of the electronic modules
  • Problems with module power supply

How to Fix

  1. Check the integrity of the wiring harness
  2. Inspect and clean connector contacts
  3. Check power and ground of modules
  4. Scan all modules for errors
  5. If necessary, replace the faulty module

Related codes

B2127B2129U0100

FAQ

What does the B2128 code mean?

B2128 is an OBD-II diagnostic trouble code that indicates: UART Communication

What causes a B2128 error code?

The most common causes of B2128 include: Broken or damaged wiring harness; Corrosion of contacts in connectors; Malfunction of one of the electronic modules; Problems with module power supply.

How do I fix a B2128 diagnostic trouble code?

To fix B2128: Check the integrity of the wiring harness. Inspect and clean connector contacts. Check power and ground of modules. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2128?

Do not drive — repair immediately

How much does it cost to fix B2128?

The estimated repair cost for B2128 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat