B2126 — Key transponder authentication failure

Body (airbag, seat, lights)

Key transponder authentication failure

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Can I drive with B2126?

You can usually drive home and book an inspection within a few days.

Frequently asked questions

What does fault code B2126 mean?

B2126 means Key transponder authentication failure.

Can I keep driving with B2126?

You can usually drive home and book an inspection within a few days.

Related fault codes

• B2120 — Fuel filler door lock actuator circuit
• B2121 — Fuel filler door lock actuator circuit short to battery
• B2122 — Fuel filler door lock actuator circuit short to ground
• B2123 — Fuel filler door lock actuator circuit open
• B2124 — Key-in-ignition circuit
• B2125 — Key-in-ignition circuit range/performance
• B2127 — Key transponder — no response
• B2128 — Key transponder — signal error
• B2129 — Immobilizer — engine start not authorized

Get a full diagnosis for B2126 with AutoUncover.