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Engine-Codes – Generic – B1A28

B1A28 Code - PCM Mismatch With SKIM

Quick Answer

The B1A28 diagnostic trouble code (DTC) indicates a mismatch between the Powertrain Control Module (PCM) and the Sentry Key Immobilizer Module (SKIM) in the vehicle. Common causes include Faulty PCM or SKIM module, Wiring issues between PCM and SKIM, Software malfunction. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B1A28 indicates PCM Mismatch With SKIM.
Common causes
Common causes include Faulty PCM or SKIM module, Wiring issues between PCM and SKIM, Software malfunction.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code B1A28 Description

The B1A28 diagnostic trouble code (DTC) indicates a mismatch between the Powertrain Control Module (PCM) and the Sentry Key Immobilizer Module (SKIM) in the vehicle. The PCM is responsible for controlling various engine functions, while the SKIM is a security feature that prevents the engine from starting if an unauthorized key is used. When there is a mismatch between these two modules, it can lead to issues with the vehicle's performance and security system.

OBDII Code B1A28 - PCM Mismatch With SKIM
B1A28 Code - PCM Mismatch With SKIM

Common Causes of B1A28

  1. Faulty PCM or SKIM module
  2. Wiring issues between PCM and SKIM
  3. Software malfunction
  4. Poor electrical connections
  5. Corrosion or damage to PCM or SKIM components

Symptoms of B1A28

  1. Engine starting issues
  2. Engine misfires
  3. Rough idling
  4. Stalling
  5. Limp mode activation

How to Fix B1A28

  1. Diagnose the issue using a diagnostic scanner to retrieve the trouble codes and identify the specific problem.
  2. Inspect the wiring harness between the PCM and SKIM for any damage or loose connections.
  3. Test the PCM and SKIM modules for proper functionality and replace any faulty components.
  4. Clear the DTC using the diagnostic scanner and perform a relearn procedure to synchronize the PCM and SKIM.
  5. Test drive the vehicle to ensure the issue has been resolved and that all systems are functioning properly.

Cost to Fix B1A28

The cost of repairing a PCM mismatch with SKIM can vary depending on the extent of the issue and the specific components that need to be replaced. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. It is important to note that labor rates at auto repair shops can vary, with rates typically ranging between $80 and $150 per hour. Additionally, the cost may be higher at dealerships or in metropolitan areas, while independent shops may offer more affordable rates. It is recommended to obtain quotes from local repair shops to get a more accurate estimate for this repair.

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Code B1A28 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1A28 Code

1. What are common symptoms of OBDII code B1A28 (PCM Mismatch With SKIM)?

- Common symptoms include engine stalling, rough idling, difficulty starting the vehicle, and the illumination of the Check Engine Light.

2. What causes the OBDII code B1A28 to appear?

- The code B1A28 typically indicates a mismatch between the Powertrain Control Module (PCM) and the Sentry Key Immobilizer Module (SKIM), often caused by a communication error or a faulty module.

3. How can I diagnose the issue related to code B1A28?

- Diagnosis involves using an OBDII scanner to retrieve the code, checking for any other related codes, and conducting a thorough inspection of the PCM and SKIM modules for any signs of damage or malfunction.

4. What should I do if I encounter the OBDII code B1A28?

- If you encounter the code B1A28, it is advisable to consult a professional mechanic or dealership for a proper diagnosis and repair to avoid potential drivability issues.

5. Can I drive my vehicle with the OBDII code B1A28 present?

- While it may be possible to drive with the code present, it is not recommended as it can lead to further complications and potential safety hazards. It is best to address the issue promptly.

6. Are there any DIY repair tips for OBDII code B1A28?

- DIY repair for code B1A28 is not recommended due to the complexity of the PCM and SKIM systems. It is best to seek professional help to ensure the issue is properly diagnosed and repaired.

7. How much does it cost to repair OBDII code B1A28?

- The cost of repairing the OBDII code B1A28 can vary depending on the extent of the issue, the need for replacement parts, and labor costs. It is best to obtain quotes from reputable mechanics or dealerships.

8. Can a software update fix the PCM mismatch issue causing code B1A28?

- In some cases, a software update may resolve the PCM mismatch issue causing code B1A28. However, it is essential to have the update performed by a qualified technician to ensure proper calibration and functionality.

9. Is the OBDII code B1A28 a common issue in certain vehicle makes and models?

- The OBDII code B1A28 (PCM Mismatch With SKIM) is more commonly found in Chrysler, Dodge, and Jeep vehicles equipped with SKIM systems. However, it can potentially occur in other vehicle makes and models as well.

10. Can disconnecting the battery reset the PCM and SKIM modules to clear the code B1A28?

- Disconnecting the battery may reset the modules temporarily, but it is not a guaranteed fix for the underlying issue causing code B1A28. It is best to have the problem properly diagnosed and repaired by a professional.

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