OBD Guide
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B1798

Lamp Turn Signal Front Output Circuit Failure

B1798 is an OBD-II diagnostic trouble code meaning: Lamp Turn Signal Front Output Circuit Failure. Common causes: burnt out turn signal lamp, broken wires. Estimated repair cost: $6–56.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$6–56 (est.)

Symptoms

  • Turn indicators flashing at an increased frequency
  • Front turn signals do not work
  • Dashboard warning

Causes

  • Burnt out turn signal lamp
  • Broken wires
  • Faulty relay
  • Contact corrosion
  • Damaged wiring harness

How to Fix

  1. Check the turn signal lamp
  2. Check the integrity of the wires
  3. Check relay operation
  4. Clear contacts
  5. Replace damaged items

Related codes

B1797B1799B1800

FAQ

What does the B1798 code mean?

B1798 is an OBD-II diagnostic trouble code that indicates: Lamp Turn Signal Front Output Circuit Failure

What causes a B1798 error code?

The most common causes of B1798 include: Burnt out turn signal lamp; Broken wires; Faulty relay; Contact corrosion.

How do I fix a B1798 diagnostic trouble code?

To fix B1798: Check the turn signal lamp. Check the integrity of the wires. Check relay operation. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1798?

Do not drive — repair immediately

How much does it cost to fix B1798?

The estimated repair cost for B1798 is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat