OBD Guide
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B26F1

Ignition Relay Off

B26F1 is an OBD-II diagnostic trouble code meaning: Ignition Relay Off. Common causes: faulty ignition relay, open or short circuit in wiring harness. Estimated repair cost: $6–56.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–56 (est.)

Symptoms

  • Engine won't start
  • No power to dashboard
  • The fuel pump and injection system do not work

Causes

  • Faulty ignition relay
  • Open or short circuit in wiring harness
  • Problems with the engine control unit (ECU)
  • Corrosion of relay contacts or connectors

How to Fix

  1. Check the condition of the ignition relay (visual inspection, testing with a multimeter)
  2. Check the integrity of the wiring harness and contacts in the relay circuit
  3. Replace the ignition relay if a fault is detected
  4. Check power and control signals from the ECU
  5. Clean contacts from corrosion if necessary

Related codes

P0685P0686P0687

FAQ

What does the B26F1 code mean?

B26F1 is an OBD-II diagnostic trouble code that indicates: Ignition Relay Off

What causes a B26F1 error code?

The most common causes of B26F1 include: Faulty ignition relay; Open or short circuit in wiring harness; Problems with the engine control unit (ECU); Corrosion of relay contacts or connectors.

How do I fix a B26F1 diagnostic trouble code?

To fix B26F1: Check the condition of the ignition relay (visual inspection, testing with a multimeter). Check the integrity of the wiring harness and contacts in the relay circuit. Replace the ignition relay if a fault is detected. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B26F1?

Yes, but get it checked soon

How much does it cost to fix B26F1?

The estimated repair cost for B26F1 is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat