OBD Guide
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P1629

Theft Deterrent Start Enable Signal Not Received

P1629 is an OBD-II diagnostic trouble code meaning: Theft Deterrent Start Enable Signal Not Received. Common causes: immobilizer malfunction, damaged key with chip. Estimated repair cost: $33–167.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$33–167 (est.)

Symptoms

  • Engine won't start
  • The engine stalls immediately after starting
  • The immobilizer indicator is flashing
  • The alarm does not go off when trying to start
  • No spark or fuel supply

Causes

  • Immobilizer malfunction
  • Damaged key with chip
  • Open circuit in the anti-theft system
  • ECU software failure
  • Problems with communication between modules

How to Fix

  1. Check the condition of the ignition key and its chip
  2. Diagnose the immobilizer circuit for opens and short circuits
  3. Check the functionality of the immobilizer module
  4. Reflash or retrain keys
  5. Repair only from an authorized dealer

Related codes

P1628P1630P1631

Error P1629 by Vehicle Brand

BuickCadillacChevroletGMGMCOldsmobileSaturnVolkswagen

FAQ

What does the P1629 code mean?

P1629 is an OBD-II diagnostic trouble code that indicates: Theft Deterrent Start Enable Signal Not Received

What causes a P1629 error code?

The most common causes of P1629 include: Immobilizer malfunction; Damaged key with chip; Open circuit in the anti-theft system; ECU software failure.

How do I fix a P1629 diagnostic trouble code?

To fix P1629: Check the condition of the ignition key and its chip. Diagnose the immobilizer circuit for opens and short circuits. Check the functionality of the immobilizer module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1629?

Yes, but get it checked soon

How much does it cost to fix P1629?

The estimated repair cost for P1629 is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat