OBD Guide
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B2742

Front Fog Lamp Switch Circuit Low

B2742 is an OBD-II diagnostic trouble code meaning: Front Fog Lamp Switch Circuit Low. Common causes: faulty fog light switch, open or short circuit in wiring harness. Estimated repair cost: $22–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–111 (est.)

Symptoms

  • Fog lights don't turn on
  • Fog lights turn on/off randomly
  • Error message on the dashboard

Causes

  • Faulty fog light switch
  • Open or short circuit in wiring harness
  • Poor contact in connectors
  • Body Module (BCM) Malfunction
  • Circuit Grounding Problems

How to Fix

  1. Check the serviceability of the fog light switch
  2. Inspect the wiring harness for damage
  3. Check connections and contacts in connectors
  4. Check voltage at switch and BCM
  5. If necessary, replace the switch or repair the wiring

Related codes

B2743B2741B2740

FAQ

What does the B2742 code mean?

B2742 is an OBD-II diagnostic trouble code that indicates: Front Fog Lamp Switch Circuit Low

What causes a B2742 error code?

The most common causes of B2742 include: Faulty fog light switch; Open or short circuit in wiring harness; Poor contact in connectors; Body Module (BCM) Malfunction.

How do I fix a B2742 diagnostic trouble code?

To fix B2742: Check the serviceability of the fog light switch. Inspect the wiring harness for damage. Check connections and contacts in connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2742?

Limited driving only, diagnose soon

How much does it cost to fix B2742?

The estimated repair cost for B2742 is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat