The diagnostic trouble code (DTC) B101E:48 on a Chevrolet vehicle indicates “Electronic Control Unit Software – Security Code Not Programmed.” This error typically arises during key programming or immobilizer-related procedures. This article discusses a real-world scenario encountering this DTC while attempting to program a new smart key fob using a Topdon Topscan PRO diagnostic tool.
Troubleshooting B101E:48 with Topdon Topscan PRO
Initially, a full diagnostic scan revealed no DTCs. The IMMO (immobilizer) function within the Topscan PRO was used to read the immobilizer password using three available methods:
- Read Immobilizer Password (BCMAUTO): This method succeeded on the first attempt.
- Read Immobilizer Password (ECM): This method failed repeatedly.
- Read Immobilizer Password (ECM-Type01): This method also failed repeatedly.
Subsequently, the “Keyless System (CAN)” module was accessed to add a new OEM smart key. The tool correctly identified four existing keys (out of a maximum of five). The “Add Smart Key” function was initiated, requiring the previously obtained password. After placing the new key in the designated slot and waiting the instructed 12 minutes (and then 20 minutes), the process hung.
A second attempt resulted in a fleeting “wait 12 minutes” message, followed by the error: “78:The request message is received correctly, and the response is pending.” Confirming this message returned to the main menu without successfully adding the key.
A subsequent diagnostic scan revealed the DTC B101E:48, which was not present before the key programming attempt. Furthermore, all three password reading methods now failed. Contacting Topdon support resulted in a dismissive response indicating the device’s inability to handle this procedure and recommending the use of an original manufacturer’s device.
Potential Causes of DTC B101E:48
The appearance of the B101E:48 DTC after using the Topdon Topscan PRO suggests the tool may have corrupted the immobilizer password or related data within the ECM (Engine Control Module). While initially able to read the password, subsequent attempts failed, and the DTC appeared. This strongly indicates a correlation between the tool’s actions and the resulting error. It underscores the importance of using approved and validated diagnostic equipment for security-sensitive procedures like key programming. Incorrect procedures or faulty tools can lead to ECM corruption, requiring professional intervention and potentially significant repair costs.
Conclusion
Experiences with the Topdon Topscan PRO in this scenario suggest its limitations in handling Chevrolet smart key programming and the potential for causing the B101E:48 DTC. When dealing with security and immobilizer systems, utilizing manufacturer-approved tools and procedures is crucial to avoid potential damage and ensure successful key programming. If encountering DTC B101E:48, consulting a qualified Chevrolet technician with access to the appropriate diagnostic equipment is recommended.
