OBD Guide
ENFRDEESPT

B102F

Auxiliary Switch Signal Erratic

B102F is an OBD-II diagnostic trouble code meaning: Auxiliary Switch Signal Erratic. Common causes: auxiliary switch malfunction, open or short circuit in wiring harness. Estimated repair cost: $33–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–167 (est.)

Symptoms

  • Incorrect operation of auxiliary functions (for example, heated mirrors)
  • Fault indication on the dashboard
  • Intermittent operation of switch controlled systems

Causes

  • Auxiliary switch malfunction
  • Open or short circuit in wiring harness
  • Poor contact in connectors
  • Problems with the control unit

How to Fix

  1. Check the status of the auxiliary switch
  2. Inspect the wiring harness and connectors for damage.
  3. Check continuity with a multimeter
  4. If necessary, replace the switch or repair the wiring harness
  5. Reset the error and check if it returns

Related codes

B102EB1030

FAQ

What does the B102F code mean?

B102F is an OBD-II diagnostic trouble code that indicates: Auxiliary Switch Signal Erratic

What causes a B102F error code?

The most common causes of B102F include: Auxiliary switch malfunction; Open or short circuit in wiring harness; Poor contact in connectors; Problems with the control unit.

How do I fix a B102F diagnostic trouble code?

To fix B102F: Check the status of the auxiliary switch. Inspect the wiring harness and connectors for damage.. Check continuity with a multimeter. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B102F?

Limited driving only, diagnose soon

How much does it cost to fix B102F?

The estimated repair cost for B102F is $33–167. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat