OBD Guide
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B1A29

PCM Mismatch With SKIM

B1A29 is an OBD-II diagnostic trouble code meaning: PCM Mismatch With SKIM. Common causes: replacing the pcm without reprogramming, skim module malfunction. Estimated repair cost: $56–167.

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

Symptoms

  • Engine won't start
  • Check Engine Light
  • Immobilizer activated

Causes

  • Replacing the PCM without reprogramming
  • SKIM module malfunction
  • Ignition key mismatch
  • Damaged wiring harness between PCM and SKIM

How to Fix

  1. Diagnose the connection between PCM and SKIM
  2. Check the condition of the wiring harness
  3. Reprogram the SKIM and PCM module
  4. Check the ignition key and its chip
  5. Replace faulty components if necessary

Related codes

B1A28B1A30P0513

FAQ

What does the B1A29 code mean?

B1A29 is an OBD-II diagnostic trouble code that indicates: PCM Mismatch With SKIM

What causes a B1A29 error code?

The most common causes of B1A29 include: Replacing the PCM without reprogramming; SKIM module malfunction; Ignition key mismatch; Damaged wiring harness between PCM and SKIM.

How do I fix a B1A29 diagnostic trouble code?

To fix B1A29: Diagnose the connection between PCM and SKIM. Check the condition of the wiring harness. Reprogram the SKIM and PCM module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1A29?

Yes, but get it checked soon

How much does it cost to fix B1A29?

The estimated repair cost for B1A29 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat