OBD Guide
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B256B

Cargo Lamps Switch Circuit Malfunction

B256B is an OBD-II diagnostic trouble code meaning: Cargo Lamps Switch Circuit Malfunction. Common causes: truck headlight switch malfunction, open or short circuit. Estimated repair cost: $22–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$22–89 (est.)

Symptoms

  • Truck lights won't turn on
  • Flashing truck lights
  • Corresponding error on the dashboard

Causes

  • Truck headlight switch malfunction
  • Open or short circuit
  • Wiring Harness Problems
  • Control unit malfunction
  • Oxidation of contacts

How to Fix

  1. Check the fuse for the truck headlights.
  2. Check the condition of the switch
  3. Inspect the wiring harness for damage
  4. Check contacts for oxidation
  5. If necessary, replace the switch or restore the wiring

Related codes

B256AB256C

FAQ

What does the B256B code mean?

B256B is an OBD-II diagnostic trouble code that indicates: Cargo Lamps Switch Circuit Malfunction

What causes a B256B error code?

The most common causes of B256B include: Truck headlight switch malfunction; Open or short circuit; Wiring Harness Problems; Control unit malfunction.

How do I fix a B256B diagnostic trouble code?

To fix B256B: Check the fuse for the truck headlights.. Check the condition of the switch. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B256B?

Yes, but get it checked soon

How much does it cost to fix B256B?

The estimated repair cost for B256B is $22–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat