B1297 – Power Supply Sensor Circuit Open

The ODBII code B1297 indicates that there is an open circuit in the power supply sensor, which may affect the operation of various electrical components in the vehicle.

The severity of ODBII code B1297 is moderate.

Common Causes For: B1296 Power Supply Sensor Circuit Failure

• Open circuit in the wiring
• Faulty power supply sensor
• Poor electrical connections
• Blown fuse
• Corroded connectors
• Short circuit in the harness
• Faulty engine control module (ECM)

Common misdiagnosis for B1297 Power Supply Sensor Circuit Open

• Battery issues
• Faulty wiring or connectors
• Malfunctioning power supply module
• Defective sensors
• ECU (Engine Control Unit) problems
• Grounding issues
• Other circuit faults in the vehicle’s electrical system

Common Troubleshooting Steps

The OBD-II code B1297 indicates a problem with the power supply sensor circuit, specifically that the circuit is open. This can be related to various components in the vehicle’s electrical system. Here are some common troubleshooting steps to diagnose and resolve the issue:

• Check the Vehicle’s Battery:
• Ensure the battery is fully charged and in good condition. A weak or dead battery can cause various electrical issues.
• Inspect Fuses:
• Check the fuses related to the power supply sensor circuit. A blown fuse can lead to an open circuit.
• Visual Inspection:
• Inspect the wiring and connectors associated with the power supply sensor. Look for any signs of damage, corrosion, or loose connections.
• Test the Power Supply Sensor:
• If applicable, test the power supply sensor itself using a multimeter. Check for proper voltage and resistance according to the manufacturer’s specifications.
• Check Ground Connections:
• Ensure that all ground connections related to the power supply sensor are secure and free of corrosion. Poor ground connections can lead to circuit issues.
• Scan for Additional Codes:
• Use an OBD-II scanner to check for any other trouble codes that may provide additional context or indicate related issues.
• Inspect Related Components:
• Depending on the vehicle, the power supply sensor may be linked to other components (like the engine control module or body control module). Inspect these components for faults.
• Perform a Continuity Test:
• Use a multimeter to perform a continuity test on the wiring harness associated with the power supply sensor. This will help identify any breaks in the circuit.
• Check for Short Circuits:
• Look for any short circuits in the wiring that could be causing the open circuit condition.
• Consult Service Manual:
• Refer to the vehicle’s service manual for specific diagnostic procedures and specifications related to the power supply sensor circuit. 1
• Clear Codes and Test Drive:
• After performing repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns. If these steps do not resolve the issue, it may be necessary to consult a professional mechanic or technician for further diagnosis and repair.