AutoCodes – Generic – B1A28

B1A28 Code - PCM Mismatch With SKIM

Quick Answer

For the engine to start, the Sentry Key Immobilizer (SKIM) feature of the Radio Frequency Hub (RF Hub) and the Powertrain Control Module (PCM) must successfully communicate data over the data bus. Common causes include Faulty Radio Frequency Hub (RF Hub), Faulty Powertrain Control Module (PCM). 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 Radio Frequency Hub (RF Hub), Faulty Powertrain Control Module (PCM).
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.

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Code Popularity 13,777

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 13, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1A28 Description

For the engine to start, the Sentry Key Immobilizer (SKIM) feature of the Radio Frequency Hub (RF Hub) and the Powertrain Control Module (PCM) must successfully communicate data over the data bus. Once the RF Hub sends the message that a valid Fob-Integrated-Key (FOBIK) is being used, the PCM and RF Hub perform a "handshake" routine, encrypted with the VIN, to validate this information, and a match allows the engine to run when the ignition state transitions to Start or a remote start occurrence. The repair of this fault is determined by the ability of the RF Hub and PCM to complete a successful handshake routine over the bus. Whenever a valid FOBIK is in the vehicle and the ignition is turned to the ON position or a valid remote start is active, the RF Hub/PCM handshake takes place. The RF Hub validates that the message is sent to, and received by the PCM.
When a valid FOBIK is used and the RF Hub receives a mismatching cryptology code from the PCM as part of the routine, the RF Hub will send the command to flash the Security warning lamp and set this Diagnostic Trouble Code (DTC) as active. The engine will not start and the DTC will remain active until the RF Hub and PCM complete a successful handshake.

OBDII Code B1A28 - PCM Mismatch With SKIM - AutoCodes.com — B1A28 Code - PCM Mismatch With SKIM

What does this mean?

What are the Possible Causes of the DTC B1A28?

Faulty Radio Frequency Hub (RF Hub)
Faulty Powertrain Control Module (PCM)

How to Fix the DTC B1A28?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1A28 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Information for Specific Makes

B1A28 Chrysler — PCM Mismatch With SKIM
B1A28 Dodge — PCM Mismatch With SKIM
B1A28 Jeep — PCM Mismatch With SKIM
B1A28 RAM — PCM Mismatch With SKIM

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.