B1299 – OBD-II DTC

OBD-II DTC B1299 – Power Supply Sensor Circuit Short To Ground

DTC B1299 meaning

DTC B1299 refers to a diagnostic trouble code indicating a short circuit to ground in the power supply sensor circuit. This code is typically associated with issues in the vehicle’s electrical system, particularly affecting the sensors that monitor power supply levels. When the power supply sensor detects an abnormal condition, it triggers the code to alert the vehicle’s onboard diagnostic system.

DTC B1299 symptoms

Common symptoms associated with DTC B1299 may include:

• Illumination of the check engine light
• Erratic or unstable readings from the power supply sensor
• Possible issues with vehicle performance
• Increased fuel consumption
• Electrical components malfunctioning or behaving unpredictably

DTC B1299 causes

Several factors can lead to the occurrence of DTC B1299, including:

• Wiring issues such as frayed or damaged wires
• Corroded connectors in the power supply sensor circuit
• Faulty power supply sensor
• Short circuits in the electrical system
• Issues with the vehicle’s battery or charging system

DTC B1299 seriousness

DTC B1299 can be considered serious as it may indicate a failure in the power supply sensor circuit, which can affect the vehicle’s overall electrical system. If left unaddressed, it may lead to further electrical issues, reduced vehicle performance, or even complete failure of electrical components. It is advisable to diagnose and repair the issue promptly to avoid complications.

How to diagnose DTC B1299

To diagnose DTC B1299, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the DTC.
2. Inspect the wiring and connectors associated with the power supply sensor for any visible damage or corrosion.
3. Check the power supply sensor for proper operation using a multimeter.
4. Test for continuity in the wiring to ensure there are no breaks or shorts.
5. Examine the vehicle’s battery and charging system for any irregularities.
6. Clear the DTC and perform a road test to see if the code returns.

How to fix DTC B1299 step-by-step instructions

To fix DTC B1299, follow these step-by-step instructions:

1. Identify and repair any damaged wiring or connectors in the power supply sensor circuit.
2. Replace the power supply sensor if it is found to be faulty.
3. Ensure all connections are clean and secure to prevent future issues.
4. Test the vehicle’s battery and charging system, replacing any faulty components as necessary.
5. Clear the DTC using an OBD-II scanner.
6. Perform a road test to confirm that the issue has been resolved and the code does not return.

How to erase DTC B1299

To erase DTC B1299, 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 DTC menu on the scanner.
4. Select the option to clear or erase the trouble codes.
5. Confirm the action and wait for the scanner to complete the process.
6. Disconnect the scanner and start the vehicle to ensure the code does not reappear.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.