how to fix the B1234 code on my Ford Explorer Sixth Generation (2020-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Tools required: OBD-II scanner, multimeter, load tester, socket set, wire brush.

2. Clean Battery Terminals

• Use a wire brush to clean any corrosion on the battery terminals and cable connectors.
• Ensure that both positive and negative terminals are free from any buildup.
• Reconnect the terminals securely.

3. Test and Replace Battery (if necessary)

• If the battery voltage is below 12.4V or the load test fails, proceed to replace the battery.
  • Remove the battery by loosening the hold-down bracket and disconnecting the terminals (negative first, then positive).
  • Install a new battery, connecting the positive terminal first, followed by the negative terminal.
  • Ensure the battery is secured with the hold-down bracket.

4. Inspect and Replace Battery Management Module (if necessary)

• If the battery and connections are good but the B1234 code persists:
  • Locate the battery management module (typically near the battery or integrated into the engine bay).
  • Disconnect the battery and remove the module by unscrewing any retaining screws and disconnecting the wiring harness.
  • Install a new module, reconnect the wiring harness, and secure it with screws.

5. System Reset

• Reconnect the negative battery terminal and use the OBD-II scanner to clear the B1234 code.
• Start the vehicle to ensure that the code does not reappear.