OBD Guide
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B131A

Delayed Accessory Power Circuit Short

B131A is an OBD-II diagnostic trouble code meaning: Delayed Accessory Power Circuit Short. Common causes: short circuit in wiring harness, corrosion of contacts and connectors. Estimated repair cost: $22–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–89 (est.)

Symptoms

  • Failure of additional equipment
  • Blown fuses
  • Intermittent audio system operation
  • Interior lighting flashing
  • Constantly burning lights when the ignition is off

Causes

  • Short circuit in wiring harness
  • Corrosion of contacts and connectors
  • Faulty power relay
  • Damaged fuse
  • Problems with additional consumers (radio, cigarette lighter)

How to Fix

  1. Check and, if necessary, replace the fuses of the relevant circuit
  2. Visually inspect the wiring harness for damage.
  3. Check contacts for corrosion and oxidation
  4. Test the accessory power relay
  5. Carry out diagnostics with a multimeter to find a short circuit

Related codes

B131BB131CB1320

FAQ

What does the B131A code mean?

B131A is an OBD-II diagnostic trouble code that indicates: Delayed Accessory Power Circuit Short

What causes a B131A error code?

The most common causes of B131A include: Short circuit in wiring harness; Corrosion of contacts and connectors; Faulty power relay; Damaged fuse.

How do I fix a B131A diagnostic trouble code?

To fix B131A: Check and, if necessary, replace the fuses of the relevant circuit. Visually inspect the wiring harness for damage.. Check contacts for corrosion and oxidation. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B131A?

Limited driving only, diagnose soon

How much does it cost to fix B131A?

The estimated repair cost for B131A is $22–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat