OBD Guide
ENFRDEESPT

B2578

Right Front Turn Signal Monitor Circuit

B2578 is an OBD-II diagnostic trouble code meaning: Right Front Turn Signal Monitor Circuit. Common causes: burnt out turn signal lamp, open or short circuit in wiring harness. Estimated repair cost: $11–56.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$11–56 (est.)

Symptoms

  • The right front turn signal flashes at an increased frequency
  • The right front turn signal does not work
  • Warning light on dashboard

Causes

  • Burnt out turn signal lamp
  • Open or short circuit in wiring harness
  • Poor contact in the connector
  • Contact corrosion
  • Control unit malfunction

How to Fix

  1. Check the condition of the right front turn signal lamp
  2. Inspect the wiring harness for damage
  3. Check the contacts in the connectors for corrosion or oxidation
  4. Check the voltage in the turn signal circuit
  5. If necessary, replace the lamp, wiring or control unit

Related codes

B2579B2580B2581

FAQ

What does the B2578 code mean?

B2578 is an OBD-II diagnostic trouble code that indicates: Right Front Turn Signal Monitor Circuit

What causes a B2578 error code?

The most common causes of B2578 include: Burnt out turn signal lamp; Open or short circuit in wiring harness; Poor contact in the connector; Contact corrosion.

How do I fix a B2578 diagnostic trouble code?

To fix B2578: Check the condition of the right front turn signal lamp. Inspect the wiring harness for damage. Check the contacts in the connectors for corrosion or oxidation. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2578?

Limited driving only, diagnose soon

How much does it cost to fix B2578?

The estimated repair cost for B2578 is $11–56. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat