B1306 — Oil Level Switch Circuit Open #

The wording of this code may vary depending on the vehicle manufacturer (OEM). Always refer to your vehicle’s specific service documentation for the most accurate description.

• Oil Level Switch Circuit Open (General)
• Engine Oil Level Sensor Circuit Open (Ford)
• Engine Oil Level Switch, Open Circuit (GM/Chevrolet)
• Oil Sensor Circuit Open (Toyota)

Summary of code B1306 #

The B1306 code is an OBD-II Body system Diagnostic Trouble Code (DTC) that indicates the oil level switch circuit has been detected as open by the vehicle’s control module. In simple terms, this means the electrical circuit monitoring the engine oil level is interrupted or not working as intended. This could be due to a disconnection, damaged wiring, or a failed sensor. While this code typically does not cause immediate drivability issues, it may prevent the oil level warning system from alerting you to low oil conditions, potentially putting your engine at risk. Early diagnosis and repair help ensure your engine is protected from low oil levels and related damage.

Frequent symptoms for code B1306 #

When the B1306 code is stored, symptoms are often subtle and related to the oil level monitoring system. Most of the time, you may not notice any change in how the vehicle drives, but the following symptoms can occur:

• Oil warning light or message on the dashboard
• “Check Engine” or “Service Engine Soon” indicator illuminated
• Oil level reading unavailable on the instrument cluster
• Intermittent or false oil level warnings
• No oil level warning, even when oil is low

Probable causes for code B1306 #

The B1306 code is most commonly caused by faults in the oil level switch circuit itself. The following are the top probable causes, listed from most to least frequent:

1. Damaged or disconnected wiring at the oil level switch
2. Faulty engine oil level switch (sensor)
3. Corroded or loose electrical connector at the oil level switch
4. Open or shorted circuit between the oil level switch and the control module
5. Faulty Body Control Module (BCM) or Engine Control Module (ECM)—rare

Step-by-step diagnostic guide for code B1306 #

A methodical approach is key to correctly diagnosing the root cause of the B1306 code. Here is a step-by-step guide you can follow:

• Verify the code with a scan tool and record any accompanying codes.
• Inspect the engine oil level and condition—ensure the engine is properly filled.
• Visually inspect the oil level switch and its wiring for damage, disconnection, or corrosion.
• Check the electrical connector for loose pins or contamination; clean and reconnect as needed.
• Using a digital multimeter, test for continuity in the oil level switch circuit between the sensor and control module.
• If the circuit is intact, test the oil level switch for proper operation according to OEM specifications.
• If all checks out, consider scanning for any BCM or ECM update or recall, as a rare control module fault can cause this code.

Possible repairs for code B1306 #

Repairing the B1306 code focuses on restoring proper function to the oil level switch circuit. Depending on your findings, recommended actions include:

• Repair or replace damaged wiring or connectors at the oil level switch
• Replace the faulty engine oil level switch (sensor)
• Clean and secure all electrical connections related to the oil level switch
• Repair open or shorted wiring between the oil level switch and control module
• In rare cases, reprogram or replace the BCM/ECM if confirmed faulty

Can you drive with code B1306? #

Limited. You can drive with code B1306, but caution is advised. This code itself does not directly affect vehicle performance or safety systems. However, it disables the vehicle’s ability to alert you to low engine oil, which is critical for engine protection. If you choose to drive, check your engine oil level manually and monitor it regularly until the issue is fixed. Ignoring this could lead to undetected low oil, risking severe engine damage.

Vehicles most commonly affected by code B1306 #

While the B1306 code can appear on many vehicles, it is most frequently found on models where OEMs use dedicated oil level switches and advanced body control monitoring. The following vehicles are commonly affected:

• Ford F-Series (F-150, F-250, etc.)
• Chevrolet Silverado and GMC Sierra
• Toyota Camry, Corolla, and RAV4
• Honda Accord and Civic (select years)
• Hyundai Sonata and Elantra

This list is not exhaustive; always check your vehicle’s OEM service information for specifics.

Common mistakes & best practices for code B1306 #

A few common pitfalls can delay or complicate the repair of B1306. Following best practices will help you avoid unnecessary repairs and costs:

• Replacing the oil level switch without first checking wiring and connectors
• Ignoring the code because the car drives normally—risking low oil damage
• Overlooking corrosion or water intrusion at the sensor connector
• Not clearing the code after repairs, leading to confusion if the warning remains illuminated
• Using incorrect replacement parts—always use OEM or high-quality equivalents

Quick FAQ for code B1306 #

Here are some rapid-fire answers to frequently asked questions about B1306:

• Q: Will B1306 cause my car to fail inspection?
  A: In most regions, B-codes do not cause an inspection failure, but a persistent warning light may raise flags with inspectors.
• Q: Can I reset the code without fixing the problem?
  A: You can clear the code with a scan tool, but it will return if the underlying issue is not resolved.
• Q: Is it safe to replace the oil level switch myself?
  A: If you are comfortable with basic tools and electrical connections, this is a straightforward DIY repair. Always disconnect the battery before working on electrical components.