OBD Guide
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B12A4

Infotainment Faceplate Control Module

B12A4 is an OBD-II diagnostic trouble code meaning: Infotainment Faceplate Control Module. Common causes: oxidation of contacts in connectors, open/short circuit in wiring harness. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Media control buttons do not work
  • Media display does not respond to commands
  • Audio system malfunctions
  • Spontaneous activation/deactivation of functions

Causes

  • Oxidation of contacts in connectors
  • Open/short circuit in wiring harness
  • Module software failure
  • Mechanical damage to the module
  • Power problems (fuses, relays)

How to Fix

  1. Check fuses and relays associated with the multimedia system
  2. Inspect the wiring harness and connectors for damage.
  3. Perform module diagnostics using a scanner
  4. Try to reboot the system (disconnect the battery for 15 minutes)
  5. If necessary, replace the control module
  6. Update system software (if available)

Related codes

U0155U0214B1325

FAQ

What does the B12A4 code mean?

B12A4 is an OBD-II diagnostic trouble code that indicates: Infotainment Faceplate Control Module

What causes a B12A4 error code?

The most common causes of B12A4 include: Oxidation of contacts in connectors; Open/short circuit in wiring harness; Module software failure; Mechanical damage to the module.

How do I fix a B12A4 diagnostic trouble code?

To fix B12A4: Check fuses and relays associated with the multimedia system. Inspect the wiring harness and connectors for damage.. Perform module diagnostics using a scanner. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B12A4?

Limited driving only, diagnose soon

How much does it cost to fix B12A4?

The estimated repair cost for B12A4 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat