OBD Guide
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B1872

Turn Signal / Hazard Power Feed Circuit Short To Battery

B1872 is an OBD-II diagnostic trouble code meaning: Turn Signal / Hazard Power Feed Circuit Short To Battery. Common causes: wiring harness damage, turn signal relay malfunction. Estimated repair cost: $33–111.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$33–111 (est.)

Symptoms

  • Turn signals don't work
  • hazard alarm not working
  • constant lighting of indicator lamps
  • fuse blown

Causes

  • wiring harness damage
  • Turn signal relay malfunction
  • short circuit in the switching block
  • problems with contacts in the indicator switch

How to Fix

  1. Check the turn signal fuses
  2. Inspect the wiring harness for damage
  3. Check turn signal relay
  4. Diagnose the switching unit and switch
  5. Repair detected short circuits

Related codes

B1870B1871B1873

FAQ

What does the B1872 code mean?

B1872 is an OBD-II diagnostic trouble code that indicates: Turn Signal / Hazard Power Feed Circuit Short To Battery

What causes a B1872 error code?

The most common causes of B1872 include: wiring harness damage; Turn signal relay malfunction; short circuit in the switching block; problems with contacts in the indicator switch.

How do I fix a B1872 diagnostic trouble code?

To fix B1872: Check the turn signal fuses. Inspect the wiring harness for damage. Check turn signal relay. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1872?

Do not drive — repair immediately

How much does it cost to fix B1872?

The estimated repair cost for B1872 is $33–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat