B1249 Double Locking ECU Communication Stop

OBD2 Code: B1249

Description: Double locking ECU communication stop.

Definition: This code indicates a communication failure between the double locking system and the ECU (Electronic Control Unit). It suggests that there is an issue with the data exchange necessary for the proper operation of the vehicle’s double locking mechanism, which may affect security features.

b1249 – Double Locking ECU Communication Stop

Severity: Critical

Common Causes

b1249 – Double Locking ECU Communication Stop

Description: This OBD2 code indicates a communication error with the Double Locking ECU.

Common Causes:

• Faulty wiring or connections in the communication system
• Defective Double Locking ECU
• Interference from other electronic devices

Common Misdiagnosis

OBD2 Code: B1249

Description: Double Locking ECU Communication Stop

Common Misdiagnosis: Replacing the ECU without checking for wiring issues or connector problems.

Common Diagnostic Steps

OBD2 Code: B1249
Description: Double Locking ECU Communication Stop

• Check for Faulty Double Locking ECU: Inspect the double locking ECU for any visible damage or signs of malfunction.
• Inspect Wiring and Connectors: Examine the wiring harness and connectors associated with the double locking system for any loose connections, corrosion, or damage.
• Test Communication Lines: Use a multimeter to test continuity on communication lines between the double locking ECU and other related modules.
• Scan for Additional Codes: Use an OBD2 scanner to check if there are additional codes that might indicate related issues in the vehicle’s network.
• Update or Reprogram ECU Software: Check if there is an available software update for the double locking ECU and perform reprogramming if necessary.
• Perform a Hard Reset: Disconnect the battery for a few minutes to reset all ECUs, then reconnect and check if the issue persists.