B2491 – OBD-II DTC

OBD-II DTC B2491 – RF PARK LAMP OUTPUT CIRCUIT Short to Battery

DTC B2491 meaning

DTC B2491 refers to a diagnostic trouble code indicating a short circuit in the RF (right front) park lamp output circuit to battery. This code is generated when the vehicle’s onboard diagnostic system detects that the voltage in the park lamp circuit is higher than expected, suggesting a direct connection to the battery voltage.

DTC B2491 symptoms

Common symptoms associated with DTC B2491 may include:

• Right front park lamp not functioning
• Illumination of the check engine light or warning indicator
• Possible malfunction of other lighting systems
• Inconsistent operation of the vehicle’s electrical systems

DTC B2491 causes

Several factors can lead to the occurrence of DTC B2491, including:

• Short circuit in the wiring harness
• Faulty park lamp assembly
• Corroded or damaged connectors
• Malfunctioning body control module (BCM)
• Incorrectly installed or aftermarket lighting components

DTC B2491 seriousness

DTC B2491 is considered a moderate to serious issue. While it may not immediately affect the drivability of the vehicle, it can lead to safety concerns due to non-functional lighting. Additionally, unresolved electrical issues can cause further damage to the vehicle’s electrical system.

How to diagnose DTC B2491

To diagnose DTC B2491, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the code.
2. Inspect the right front park lamp circuit for visible damage or corrosion.
3. Check the wiring harness for shorts or breaks.
4. Test the park lamp assembly for proper operation.
5. Examine the body control module for faults or programming issues.
6. Perform continuity and resistance tests on the circuit.

How to fix DTC B2491 step-by-step instructions

To fix DTC B2491, follow these steps:

1. Disconnect the vehicle’s battery to ensure safety.
2. Inspect and repair any damaged wiring or connectors in the park lamp circuit.
3. Replace the right front park lamp assembly if it is faulty.
4. Check and, if necessary, reprogram or replace the body control module.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Test the park lamp operation to ensure the issue is resolved.

How to erase DTC B2491

To erase DTC B2491, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the trouble codes section on the scanner.
4. Select the option to clear or erase the codes.
5. Confirm the action and wait for the scanner to complete the process.
6. Disconnect the scanner and start the vehicle to verify that the code does not return.

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