AutoCodes – Chrysler – B1A29 Chrysler

B1A29 Chrysler 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 Wireless Control Module (WCM), 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: B1A29 Chrysler indicates PCM Mismatch With SKIM.
Common causes: Common causes include Faulty Wireless Control Module (WCM), 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 2,482

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 B1A29 Chrysler 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 B1A29 Chrysler - PCM Mismatch With SKIM - AutoCodes.com — B1A29 Chrysler Code - PCM Mismatch With SKIM

What does this mean?

What are the Possible Causes of the DTC B1A29 Chrysler?

Faulty Wireless Control Module (WCM)
Faulty Powertrain Control Module (PCM)

How to Fix the DTC B1A29 Chrysler?

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 B1A29 Chrysler 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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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 B1A29 Chrysler Code

1. What are the common symptoms of OBDII code B1A29 Chrysler indicating a PCM mismatch with SKIM?

The common symptoms include the engine not starting, the vehicle going into anti-theft mode, and the presence of the warning light on the dashboard.

2. What are the possible causes of OBDII code B1A29 Chrysler related to PCM mismatch with SKIM?

The potential causes can include a faulty SKIM module, a malfunctioning PCM, an issue with the wiring between the PCM and SKIM, or a software communication error.

3. How can I diagnose OBDII code B1A29 Chrysler indicating a PCM mismatch with SKIM?

Diagnosis typically involves using a diagnostic scanner to retrieve the fault codes, checking the connections between the PCM and SKIM, and performing a thorough inspection of the SKIM module and PCM.

4. Can OBDII code B1A29 Chrysler indicating a PCM mismatch with SKIM be repaired at home?

Fixing this issue may require specialized tools and knowledge, so it is recommended to consult a professional mechanic or dealership for proper diagnosis and repair.

5. Is it safe to drive with OBDII code B1A29 Chrysler related to PCM mismatch with SKIM?

It is not recommended to drive the vehicle with this code present, as it may lead to starting or anti-theft issues that could leave you stranded.

6. What are the repair options for OBDII code B1A29 Chrysler due to PCM mismatch with SKIM?

Repair options may include reprogramming or replacing the PCM or SKIM module, repairing any wiring issues, or updating the software to ensure proper communication between the modules.

7. How much does it typically cost to repair OBDII code B1A29 Chrysler caused by a PCM mismatch with SKIM?

The cost of repair can vary depending on the specific issue and the labor rates of the repair shop, but it can range from a few hundred to over a thousand dollars.

8. Can a software update fix OBDII code B1A29 Chrysler related to PCM mismatch with SKIM?

In some cases, a software update may resolve the communication issue between the PCM and SKIM, but it is best to consult a professional for the most appropriate solution.

9. How can I prevent OBDII code B1A29 Chrysler from occurring again after repair?

Regular maintenance, proper handling of the vehicle's electronic components, and timely repairs of any related issues can help prevent the recurrence of this error code.

10. Is OBDII code B1A29 Chrysler indicating a PCM mismatch with SKIM a common issue in Chrysler vehicles?

While not extremely common, this error code can occur in Chrysler vehicles, particularly in models equipped with SKIM systems and PCM modules that may experience communication issues.