OBD Guide
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B108B

Start Button Circuit 'A'

B108B is an OBD-II diagnostic trouble code meaning: Start Button Circuit 'A'. Common causes: open or short circuit in the start button circuit, start button malfunction. Estimated repair cost: $56–167.

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

Symptoms

  • The engine does not start when the button is pressed
  • The engine start light is flashing
  • The keyless entry system is unstable

Causes

  • Open or short circuit in the start button circuit
  • Start button malfunction
  • Wiring harness damage
  • Problems with the starting system control unit
  • Poor contact in connectors

How to Fix

  1. Check the continuity of the start button circuit
  2. Inspect the start button for damage
  3. Check connections and connectors
  4. Test the starting system control unit
  5. Replace faulty components

Related codes

B108AB108CB108D

FAQ

What does the B108B code mean?

B108B is an OBD-II diagnostic trouble code that indicates: Start Button Circuit 'A'

What causes a B108B error code?

The most common causes of B108B include: Open or short circuit in the start button circuit; Start button malfunction; Wiring harness damage; Problems with the starting system control unit.

How do I fix a B108B diagnostic trouble code?

To fix B108B: Check the continuity of the start button circuit. Inspect the start button for damage. Check connections and connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B108B?

Yes, but get it checked soon

How much does it cost to fix B108B?

The estimated repair cost for B108B is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat