B1306 – Oil Level Switch Circuit Open

The ODBII code B1306 indicates that there is an open circuit in the oil level switch, meaning the vehicle’s system is not receiving a signal from the oil level sensor, which may affect oil level monitoring.

The severity of ODBII code B1306 Oil Level Switch Circuit Open is moderate.

Common Causes For: B1305 Accessory Delay Relay Coil Circuit Short To Ground

• Faulty oil level switch
• Damaged wiring or connectors
• Poor electrical connections
• Corroded terminals
• Short circuit in the wiring
• Faulty engine control module (ECM)

Common misdiagnosis for B1306 Oil Level Switch Circuit Open

• Faulty oil level switch
• Wiring issues or shorts in the circuit
• Faulty engine control module (ECM)
• Oil level sensor malfunction
• Incorrect oil level readings due to oil contamination
• Issues with the vehicle’s electrical system
• Faulty connectors or terminals related to the oil level switch

Common Troubleshooting Steps

The OBD-II code B1306 indicates an issue with the oil level switch circuit, specifically that the circuit is open. This means that the vehicle’s computer is not receiving the expected signal from the oil level switch, which could be due to a variety of reasons. Here are some common troubleshooting steps to diagnose and resolve the issue:

• Check for Additional Codes: Before proceeding, check for any other trouble codes that may be present. This can provide additional context for the problem.
• Inspect the Oil Level Switch:
• Locate the oil level switch, which is typically found in the oil pan or near the oil filter.
• Visually inspect the switch for any signs of damage, corrosion, or leaks.
• Check Wiring and Connectors:
• Inspect the wiring harness and connectors leading to the oil level switch for any signs of damage, fraying, or corrosion.
• Ensure that all connections are secure and free of dirt or moisture.
• Test the Oil Level Switch:
• Use a multimeter to test the resistance of the oil level switch. Consult the vehicle’s service manual for the specific resistance values.
• If the switch is faulty, it may need to be replaced.
• Check for Ground Issues:
• Ensure that the oil level switch has a good ground connection. A poor ground can cause the circuit to appear open.
• Use a multimeter to check for continuity between the switch and the ground.
• Inspect the Engine Control Module (ECM):
• In some cases, the issue may lie with the ECM itself. Check for any signs of damage or corrosion on the ECM connectors.
• If necessary, perform a software update or reset the ECM.
• Check for Short Circuits:
• Inspect the wiring for any signs of short circuits that could cause the circuit to open.
• Use a multimeter to check for continuity in the wiring between the switch and the ECM.
• Clear the Codes and Test Drive:
• After performing the necessary repairs, clear the trouble codes using an OBD-II scanner.
• Take the vehicle for a test drive to see if the code reappears.
• Consult a Professional: If the issue persists after following these steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1306 code.