The B1391 code indicates a circuit failure with the oil level switch in the vehicle's PCM. This causes the Engine Light or Service Engine Soon Warning Light to illuminate, indicating the need for immediate attention to avoid additional damage.
Possible causes include:
- A defective oil level switch
- A damaged or shorted wiring harness
- Poor electrical connections
- A faulty PCM
It is recommended to seek professional diagnosis and repair due to the complexity of the issue.
What does it mean
The B1391 code indicates a circuit failure with the oil level switch, affecting engine performance. Promptly address this issue to avoid engine damage.
Disconnecting the battery temporarily clears the code, but professional diagnosis and repair are recommended for a permanent solution.
what are the symptoms
The B1391 code may cause the Engine Light or Service Engine Soon Warning Light to turn on, indicating a problem with the Oil Level Switch circuit. Other symptoms may vary depending on the vehicle, but could include inaccurate oil level readings on the dashboard, engine performance issues, and engine stalling or hesitation during acceleration.
To diagnose the B1391 code, you can follow these steps:
- Use an OBD-II scanner to check for trouble codes stored in the PCM.
- Inspect the Oil Level Switch and its wiring for any damage or corrosion.
- Test the resistance of the Oil Level Switch using a multimeter to see if it meets the required specifications.
- Check the connectors and terminals for any loose or damaged connections.
- If necessary, replace the Oil Level Switch and clear the codes to see if the issue is resolved.
If you're unsure about the diagnosis or repair process, it's recommended to seek professional help.
What are the causes
One possible reason for the B1391 code is a faulty oil level switch.
Other potential causes may include a damaged or shorted wiring harness, a weak electrical connection in the oil level switch circuit, or a defective Powertrain Control Module (PCM).
To avoid the B1391 code from appearing, it is advised to thoroughly inspect the listed possible causes, visually examine the wiring harness and connectors, and check for any signs of damage.
Additionally, one should look for any broken, bent, pushed out, or corroded connector pins.
If necessary, it may be wise to seek professional assistance for a proper diagnosis.
What Tools are Needed to diagnose
To diagnose the B1391 code, you will need a diagnostic scanner. This tool allows technicians to connect to the car's onboard computer system and retrieve any stored trouble codes.
Along with a diagnostic scanner, there are other common tools that can be helpful in diagnosing the B1391 code:
- Multimeter: This tool is used to measure voltage, resistance, and continuity in the electrical circuits related to the oil level switch.
- Wiring diagram: A wiring diagram is necessary to trace the circuitry and identify any potential wiring issues.
- Visual inspection tools: These tools, like a flashlight and mirror, can be used to visually inspect the oil level switch and its wiring for any signs of damage or corrosion.
For DIY diagnosis, here are some tips to consider:
- Start by visually inspecting the oil level switch and its wiring for any obvious issues.
- Use a multimeter to test the electrical connections and measure voltage at the oil level switch.
- Refer to a wiring diagram to ensure proper circuit connectivity and identify any potential problems.
How to fix Step by Step
Step 1: Visually inspect the related wiring harness and connectors, checking for any damage or corrosion.
Step 2: Look for broken, bent, pushed out, or corroded connector pins.
Step 3: Ensure a proper electrical connection with the oil level switch by cleaning the connectors and terminals, and making sure they are securely fastened.
Step 4: If necessary, replace the oil level switch with a new one.
Step 5: Check the powertrain control module (PCM) for any faults and address them accordingly.
Step 6: If the issue persists, seek professional diagnosis and repair.
What are the Common Diagnosis Mistakes
Common diagnosis mistakes can cause incorrect identification of the issue related to the B1391 code. This can result in delays in repairing the vehicle properly. It is important to avoid these common diagnostic errors and seek professional assistance when dealing with this code.
Here are some common mistakes to be aware of:
- Misinterpreting the code: It is crucial to fully understand the meaning of the B1391 code and what it specifically indicates for the vehicle's oil level switch circuit. Misinterpreting the code can lead to ineffective repairs.
- Neglecting visual inspections: It is essential to visually inspect the wiring harness, connectors, and components to identify any physical damage or poor electrical connections that may be causing the code. Neglecting these inspections can result in overlooking important issues.
What is the Repair Cost
The repair cost for resolving the B1391 code varies based on factors like location, vehicle make/model, and specific repairs needed. Labor rates range from $75 to $150 per hour, with an average diagnosis time of 1.0 hour. Additional costs may apply for parts and repairs.
Regular maintenance and inspections can help prevent the code. Seek professional diagnosis for accurate resolution.
Can I drive safely with this code?
Driving with the B1391 code can compromise safe driving. Seek professional diagnosis and repair to prevent potential issues with the oil level switch, affecting engine performance and vehicle functionality. Regular maintenance and inspections of the switch and related components are crucial. Ignoring the code can lead to engine damage and costly repairs. Promptly address the B1391 code for safe driving conditions.
Additional details:
The B1391 code indicates a problem with the oil level switch, which can impact the engine's performance. This can lead to issues such as poor fuel economy, reduced power, and potential engine damage.
Driving with this code can also affect other vehicle systems, such as the transmission and emissions control.
It is important to address the issue promptly to prevent further complications and ensure safe driving conditions.
Conclusion
In conclusion, the B1391 code indicates a circuit failure related to the oil level switch in the vehicle's PCM. This can result in the Engine Light or Service Engine Soon Warning Light turning on.
The causes of this code can include a faulty oil level switch, wiring harness issues, or a faulty PCM.
It is recommended to seek professional diagnosis and repair to prevent further damage to the vehicle.