OBD Guide
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B1A28

PCM Mismatch With SKIM

B1A28 is an OBD-II diagnostic trouble code meaning: PCM Mismatch With SKIM. Common causes: skim module malfunction, pcm software problems. 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
  • Check engine light is on
  • The car goes into emergency mode
  • Immobilizer problems

Causes

  • SKIM module malfunction
  • PCM software problems
  • Open or short circuit in wiring harness
  • Ignition key mismatch (wrong chip)

How to Fix

  1. Check connections between PCM and SKIM
  2. Read trouble codes using an OBD-II scanner
  3. Check the condition of the ignition key
  4. Update or reflash PCM/SKIM software
  5. Check and replace damaged wires

Related codes

P0513P0633B2103

FAQ

What does the B1A28 code mean?

B1A28 is an OBD-II diagnostic trouble code that indicates: PCM Mismatch With SKIM

What causes a B1A28 error code?

The most common causes of B1A28 include: SKIM module malfunction; PCM software problems; Open or short circuit in wiring harness; Ignition key mismatch (wrong chip).

How do I fix a B1A28 diagnostic trouble code?

To fix B1A28: Check connections between PCM and SKIM. Read trouble codes using an OBD-II scanner. Check the condition of the ignition key. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1A28?

Yes, but get it checked soon

How much does it cost to fix B1A28?

The estimated repair cost for B1A28 is $56–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat