OBD Guide
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B123E

Radio Keypad Button Signal Circuit

B123E is an OBD-II diagnostic trouble code meaning: Radio Keypad Button Signal Circuit. Common causes: open or short circuit in the circuit, radio button malfunction. Estimated repair cost: $11–56.

Severity
✅ Low
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$11–56 (est.)

Symptoms

  • Radio control buttons do not work
  • Freezing or incorrect operation of the head unit
  • Spontaneous operation of buttons

Causes

  • Open or short circuit in the circuit
  • Radio button malfunction
  • Wiring harness damage
  • Head unit software error

How to Fix

  1. Check the continuity of the radio button signal circuit
  2. Check the condition of buttons and contacts
  3. Inspect the wiring harness for damage
  4. Update head unit software
  5. Replace faulty components

Related codes

B123DB123FB1240

FAQ

What does the B123E code mean?

B123E is an OBD-II diagnostic trouble code that indicates: Radio Keypad Button Signal Circuit

What causes a B123E error code?

The most common causes of B123E include: Open or short circuit in the circuit; Radio button malfunction; Wiring harness damage; Head unit software error.

How do I fix a B123E diagnostic trouble code?

To fix B123E: Check the continuity of the radio button signal circuit. Check the condition of buttons and contacts. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B123E?

Do not drive — repair immediately

How much does it cost to fix B123E?

The estimated repair cost for B123E is $11–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat