B2571 – OBD-II DTC

OBD-II DTC B2571 – Left Lamp Outage Signal Circuit Short to Ground

DTC B2571 meaning

DTC B2571 refers to a diagnostic trouble code indicating a “Left Lamp Outage Signal Circuit Short to Ground.” This code is triggered when the vehicle’s onboard diagnostic system detects a short circuit in the left lamp outage signal circuit, which is responsible for monitoring the operation of the left side lighting components, such as headlights, turn signals, and taillights.

DTC B2571 symptoms

Common symptoms associated with DTC B2571 may include:

• Illumination of the check engine light or warning indicator on the dashboard.
• Inoperative left side lighting components, such as headlights or turn signals.
• Flashing or erratic behavior of the left side lights.
• Possible issues with other electrical components related to the lighting system.

DTC B2571 causes

Several factors can lead to the triggering of DTC B2571, including:

• A short circuit in the wiring harness associated with the left lamp.
• Faulty left lamp assembly or bulb.
• Corroded or damaged connectors in the lighting circuit.
• Issues with the body control module (BCM) that manages the lighting system.

DTC B2571 seriousness

The seriousness of DTC B2571 can vary based on the specific symptoms and the vehicle’s usage. However, it is generally considered a moderate issue because:

• Inoperative left side lights can lead to safety hazards, especially during nighttime driving.
• Ignoring the code may result in further electrical issues or damage to the vehicle’s lighting system.
• It may affect the vehicle’s compliance with local vehicle safety regulations.

How to diagnose DTC B2571

To diagnose DTC B2571, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC B2571.
2. Inspect the left lamp assembly and wiring for visible damage or corrosion.
3. Check the connectors for proper seating and signs of wear.
4. Test the left lamp bulb for continuity and replace if necessary.
5. Use a multimeter to check for shorts in the wiring harness.
6. Examine the body control module for faults or software issues.

How to fix DTC B2571 step-by-step instructions

To fix DTC B2571, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety while working on the electrical system.
2. Inspect and repair any damaged wiring or connectors in the left lamp circuit.
3. Replace any faulty bulbs or lamp assemblies as needed.
4. Reconnect the battery and clear the DTC using an OBD-II scanner.
5. Test the left side lighting components to ensure they are functioning correctly.
6. Re-scan the vehicle to confirm that DTC B2571 has not returned.

How to erase DTC B2571

To erase DTC B2571, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the vehicle’s ignition without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the trouble codes from the vehicle’s memory.
5. Disconnect the scanner and start the vehicle to ensure the code does not reappear.

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