The B1399 code indicates a problem with the Body Control Module (BCM) in a vehicle's Passive Anti-Theft System (PATS).
Symptoms of this code may include difficulty starting the vehicle, the engine not turning over, or the vehicle not starting at all.
The causes of the B1399 code can vary, but common culprits include a faulty BCM, a malfunctioning PATS key transponder, or a wiring issue.
To fix this problem, it is recommended to first diagnose the specific cause of the code using professional diagnostic tools.
Once the cause is determined, the appropriate repairs can be made, such as replacing the BCM, repairing or replacing the PATS key transponder, or fixing any wiring issues.
It is important to address this issue promptly to ensure the vehicle's anti-theft system functions properly and to avoid potential immobilization of the vehicle.
What does it mean
The B1399 code indicates a problem with the Body Control Module (BCM) reading an unprogrammed PATS key during key programming. This can prevent the engine from starting and affect the vehicle's performance.
Promptly addressing the B1399 code is important to ensure proper operation of the vehicle, including resolving engine light illumination and potential reduced functionality of certain systems.
what are the symptoms
The B1399 code may cause the engine light to turn on and could affect certain vehicle systems. Here are some common signs of the B1399 code and whether it is safe to drive with this code:
- Engine Light ON: When the B1399 code is detected, the engine light on the dashboard will illuminate. This indicates a problem with the PATS key programming.
- Reduced Functionality: The B1399 code can reduce the functionality of specific vehicle systems like the ignition and immobilizer. This may make it difficult to start the vehicle or prevent it from starting altogether.
- Security Concerns: Incorrect PATS key programming can pose a security risk. Without proper programming, unauthorized individuals may be able to start the vehicle, compromising its safety.
- Potential Drivability Issues: Depending on the severity, you might experience drivability problems such as stalling, rough idle, or reduced power.
It is advisable to have the B1399 code diagnosed and repaired by a professional repair shop to ensure the vehicle's safety while driving.
What are the causes
The B1399 code can be caused by several factors. To prevent DTC B1399 from occurring, it is important to take the following precautions:
- Make sure to program the Passive Anti-Theft System (PATS) key correctly. If the key is not programmed, it can trigger the B1399 code.
- Check if the Body Control Module (BCM) is faulty. The BCM activates the transceiver to read the key during programming. If the BCM is not working properly, it can prevent the key from being programmed correctly.
- Inspect the wiring harness and connectors related to the BCM. Look for any visible damage, such as broken or corroded connector pins. These issues can cause the code to appear.
- Consider other potential causes that may not be listed here. While the above causes are common, there may be other underlying issues that need attention.
It is also important to be aware of common signs of a faulty BCM, such as the engine light turning on. By addressing these causes and keeping an eye on the BCM's functionality, the occurrence of DTC B1399 can be reduced.
What Tools are Needed to diagnose
To diagnose the B1399 code, you will need specific diagnostic tools. These tools are necessary to accurately identify the cause of the code and determine the appropriate repair. Here are four important diagnostic tools for diagnosing the B1399 code:
- Diagnostic scanner: You will need a professional-grade diagnostic scanner to retrieve the B1399 code from the vehicle's onboard computer system. This scanner provides access to live data, freeze frame data, and any other relevant information needed to diagnose the code.
- Multimeter: A multimeter is used to measure voltage, resistance, and continuity in the electrical system. It is crucial for testing the wiring harness, connectors, and components associated with the B1399 code.
- PATS key programming tool: Since the B1399 code is related to the Passive Anti-Theft System (PATS), you may need a PATS key programming tool to program or reprogram the PATS keys if they are found to be unprogrammed or faulty.
- Oscilloscope: An oscilloscope is an advanced diagnostic tool that can be used to analyze electrical signals and waveforms. It is particularly useful for troubleshooting complex electrical problems that may be contributing to the B1399 code.
It is important to rely on professional diagnosis for the B1399 code as it requires specialized tools and expertise. Attempting to diagnose and repair the code without the proper tools can lead to misdiagnosis and potentially costly repairs.
How to fix Step by Step
Step 1: Check if the Passive Anti-Theft System (PATS) key is programmed.
Step 2: Inspect the wiring harness and connectors for any visual damage.
Step 3: Visually inspect for broken, bent, pushed out, or corroded connector pins.
Step 4: If the issue persists, investigate the Body Control Module (BCM).
Step 5: Regularly check and program the PATS keys, ensuring they are properly synchronized with the BCM.
Step 6: Maintain the integrity of the wiring harness and connectors to prevent future occurrences of DTC B1399.
What are the Common Diagnosis Mistakes
Common mistakes in diagnosing the B1399 code include:
- Not thoroughly checking the wiring harness and connectors for visible damage. This can cause potential issues to be missed, which may be contributing to the code being triggered.
- Assuming that the Body Control Module (BCM) is always responsible for this code. It is important to consider other possible causes as well.
- Not inspecting the key programming process for any problems. The B1399 code indicates an unprogrammed PATS key, so it is crucial to ensure that the key has been properly programmed.
- Assuming that the code is solely related to the PATS system without conducting a proper diagnosis to rule out other potential issues.
It is important to address these common mistakes to accurately diagnose and resolve the B1399 code.
What is the Repair Cost
The repair cost for DTC B1399 can vary depending on factors like location, vehicle make and model, and engine type. Labor charges range from $75 to $150 per hour, with diagnosis time typically taking 1.0 hour.
It's important to ensure the PATS key is properly programmed and there are no issues with the BCM to prevent this code. Consulting professional repair shops and accessing Factory Service Manuals is recommended for accurate information and guidance.
Can I drive safely with this code?
Driving with the B1399 code is generally safe, but it's important to address the underlying issue. The code indicates an unprogrammed PATS key or a faulty BCM.
Have the vehicle diagnosed by a professional to prevent potential damage. Ignoring the code may lead to more severe problems.
Address it promptly for optimal performance and reliability.
Conclusion
In conclusion, the B1399 code indicates a problem with the Body Control Module in a vehicle's Passive Anti-Theft System. This code is triggered when an unprogrammed PATS key is detected.
To diagnose the issue, it is recommended to check the possible causes, visually inspect the wiring harness and connectors, and examine for any damaged components or corroded connector pins.
The cost to diagnose and repair this code may vary depending on various factors.