B1867 – Battery Power Supply ECU Circuit Short To Ground

The ODBII code B1867 indicates a short circuit to ground in the battery power supply circuit of the ECU (Electronic Control Unit), which can disrupt the normal operation of the vehicle’s electrical systems.

The severity of ODBII code B1867 is typically considered moderate to severe.

Common Causes For: B1866 Battery Power Supply ECU Circuit Short To Battery

• Damaged wiring or connectors
• Shorted wires
• Faulty Battery Power Supply ECU
• Corroded connectors
• Grounding issues
• Faulty fuses
• Water intrusion or moisture damage

Common misdiagnosis for B1867 Battery Power Supply ECU Circuit Short To Ground

• Faulty Battery
• Bad Ground Connections
• Defective Wiring Harness
• Malfunctioning ECU
• Shorted Sensors
• Corroded Connectors
• Faulty Fuses
• Incorrectly Installed Aftermarket Accessories

Common Troubleshooting Steps

When dealing with an OBD-II code B1867, which indicates a “Battery Power Supply ECU Circuit Short to Ground,” it’s important to follow a systematic approach to troubleshoot the issue. Here are common troubleshooting steps:

• Verify the Code:
• Use an OBD-II scanner to confirm the presence of the B1867 code. Clear the code and see if it returns after a short drive.
• Inspect Wiring and Connectors:
• Visually inspect the wiring harness and connectors related to the Battery Power Supply ECU. Look for signs of damage, fraying, corrosion, or loose connections.
• Pay special attention to areas where the wiring may be exposed to heat, moisture, or physical wear.
• Check for Shorts to Ground:
• Use a multimeter to check for continuity between the battery power supply circuit and ground. If there is continuity, it indicates a short to ground.
• Inspect the wiring for any points where it may be pinched or damaged, causing a short.
• Test the Battery Power Supply ECU:
• If the wiring appears intact, test the Battery Power Supply ECU itself. Check for proper voltage at the ECU connector with the ignition on.
• If the ECU is not receiving the correct voltage, further investigate the power supply circuit.
• Inspect Related Components:
• Check any related components that may be connected to the Battery Power Supply ECU, such as fuses, relays, or other modules. A failure in one of these components could cause the code to trigger.
• Check Fuses and Relays:
• Inspect the fuses and relays associated with the Battery Power Supply circuit. Replace any blown fuses and test the relays for proper operation.
• Look for Additional Codes:
• Check for any other OBD-II codes that may be present. Sometimes, multiple codes can provide clues about the underlying issue.
• Perform a Visual Inspection of the ECU:
• If accessible, inspect the Battery Power Supply ECU for any signs of physical damage, corrosion, or water intrusion.
• Consult Wiring Diagrams:
• Refer to the vehicle’s wiring diagrams to understand the circuit layout and identify any potential issues in the circuit path.
• Professional Diagnosis:
• If the issue persists after performing the above steps, consider seeking help from a professional mechanic or technician who has experience with your specific vehicle make and model. By following these steps, you should be able to identify and resolve the issue causing the B1867 code. Always remember to take necessary safety precautions when working with electrical systems in vehicles.