OBD Guide
ENFRDEESPT

B1271

Theft Protection Active

B1271 is an OBD-II diagnostic trouble code meaning: Theft Protection Active. Common causes: key malfunction, problems with the transponder chip. Estimated repair cost: $56–222.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–222 (est.)

Symptoms

  • Engine won't start
  • The engine stalls immediately after starting
  • The immobilizer indicator is flashing

Causes

  • Key malfunction
  • Problems with the transponder chip
  • Immobilizer module malfunction
  • Wiring harness damage
  • Programming error

How to Fix

  1. Check the key (physical integrity and battery)
  2. Read immobilizer error codes
  3. Check wiring harness and connections
  4. Reprogram the key or immobilizer module
  5. Replace faulty components

Related codes

B1272B1273P0513P0633

FAQ

What does the B1271 code mean?

B1271 is an OBD-II diagnostic trouble code that indicates: Theft Protection Active

What causes a B1271 error code?

The most common causes of B1271 include: Key malfunction; Problems with the transponder chip; Immobilizer module malfunction; Wiring harness damage.

How do I fix a B1271 diagnostic trouble code?

To fix B1271: Check the key (physical integrity and battery). Read immobilizer error codes. Check wiring harness and connections. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1271?

Yes, but get it checked soon

How much does it cost to fix B1271?

The estimated repair cost for B1271 is $56–222. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat