OBD Guide
ENFRDEESPT

B1555

Ignition Run/Start Circuit Failure

B1555 is an OBD-II diagnostic trouble code meaning: Ignition Run/Start Circuit Failure. Common causes: open or short circuit in wiring harness, faulty ignition relay. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Engine won't start
  • Problems starting the engine
  • Check Engine Light Is On
  • Loss of engine power

Causes

  • Open or short circuit in wiring harness
  • Faulty ignition relay
  • Problems with the ignition switch
  • Engine control module (ECM) malfunction
  • Corrosion of contacts or connectors

How to Fix

  1. Check wiring harness for damage
  2. Check ignition relay and fuses
  3. Diagnose the ignition switch
  4. Check contacts and connectors for corrosion
  5. Scan the ECM for errors

Related codes

P0351P0352B1556

FAQ

What does the B1555 code mean?

B1555 is an OBD-II diagnostic trouble code that indicates: Ignition Run/Start Circuit Failure

What causes a B1555 error code?

The most common causes of B1555 include: Open or short circuit in wiring harness; Faulty ignition relay; Problems with the ignition switch; Engine control module (ECM) malfunction.

How do I fix a B1555 diagnostic trouble code?

To fix B1555: Check wiring harness for damage. Check ignition relay and fuses. Diagnose the ignition switch. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1555?

Yes, but get it checked soon

How much does it cost to fix B1555?

The estimated repair cost for B1555 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat