OBD Guide
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B10F1

Key In Switch Circuit Open

B10F1 is an OBD-II diagnostic trouble code meaning: Key In Switch Circuit Open. Common causes: broken or damaged wiring harness, ignition key switch malfunction. Estimated repair cost: $56–167.

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

Symptoms

  • Problems starting the engine
  • Engine stalls after starting
  • Malfunctions in the ignition system

Causes

  • Broken or damaged wiring harness
  • Ignition key switch malfunction
  • Poor contact in connectors
  • Short circuit in the circuit

How to Fix

  1. Check the integrity of the wiring harness
  2. Check the condition of the ignition key switch
  3. Clean and check contacts in connectors
  4. Replace damaged components

Related codes

B10F0B10F2

FAQ

What does the B10F1 code mean?

B10F1 is an OBD-II diagnostic trouble code that indicates: Key In Switch Circuit Open

What causes a B10F1 error code?

The most common causes of B10F1 include: Broken or damaged wiring harness; Ignition key switch malfunction; Poor contact in connectors; Short circuit in the circuit.

How do I fix a B10F1 diagnostic trouble code?

To fix B10F1: Check the integrity of the wiring harness. Check the condition of the ignition key switch. Clean and check contacts in connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B10F1?

Limited driving only, diagnose soon

How much does it cost to fix B10F1?

The estimated repair cost for B10F1 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat