OBD Guide
ENFRDEESPT

B121A

Keypad Illumination Output Circuit Short to Ground

B121A is an OBD-II diagnostic trouble code meaning: Keypad Illumination Output Circuit Short to Ground. Common causes: wiring harness damage, short circuit in the circuit. Estimated repair cost: $56–167.

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

Symptoms

  • No keyboard backlight
  • Backlight flashing
  • Incorrect operation of buttons

Causes

  • Wiring harness damage
  • Short circuit in the circuit
  • Keyboard problem
  • Problems with the control module

How to Fix

  1. Check the wiring harness for damage
  2. Check the backlight circuit for short circuit
  3. Check the functionality of the keyboard
  4. Replace faulty components if necessary

Related codes

B121BB121CB121D

FAQ

What does the B121A code mean?

B121A is an OBD-II diagnostic trouble code that indicates: Keypad Illumination Output Circuit Short to Ground

What causes a B121A error code?

The most common causes of B121A include: Wiring harness damage; Short circuit in the circuit; Keyboard problem; Problems with the control module.

How do I fix a B121A diagnostic trouble code?

To fix B121A: Check the wiring harness for damage. Check the backlight circuit for short circuit. Check the functionality of the keyboard. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B121A?

Limited driving only, diagnose soon

How much does it cost to fix B121A?

The estimated repair cost for B121A is $56–167. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat