B1377 Code Meaning, Symptoms, Causes and How to Fix

The B1377 code indicates a possible problem with the Oil Change Lamp, as detected by the Powertrain Control Module (PCM) in the vehicle's OBDII system.

This code may be triggered due to a faulty lamp, wiring issues, or a malfunctioning PCM.

Automotive professionals should be aware of the meaning, symptoms, causes, and possible fixes for the B1377 code.

What does it mean

The B1377 code indicates a malfunctioning Oil Change Lamp. This lamp is responsible for alerting drivers when an oil change is needed. It does not directly affect vehicle performance. However, it is important to address this issue to ensure accurate maintenance notifications.

There are some common misconceptions surrounding this code. One misconception is that it impacts engine performance. However, the B1377 code is specific to the Oil Change Lamp and does not have any direct effect on the engine's performance.

Another misconception is that the code signals a major problem. In reality, a malfunctioning Oil Change Lamp is a relatively minor issue that can be easily resolved. It is important to understand that this code is simply indicating a problem with the lamp itself, rather than a larger underlying issue with the vehicle.

what are the symptoms

The B1377 code is commonly associated with the Engine Light or Service Engine Soon Warning Light turning on, indicating a potential issue with the Oil Change Lamp. The symptoms may vary depending on the type of vehicle you have.

To effectively troubleshoot the B1377 code, here are some tips to consider:

1. Check the Oil Change Lamp by inspecting the bulb and the related wiring harness.
2. Look for any damage to the wiring harness and connectors, such as fraying or corrosion.
3. Examine the connector pins for any issues like being broken, bent, pushed out, or corroded, as it may affect the electrical connection.

What are the causes

The B1377 code can be caused by various factors, including:

• Faulty Oil Change Lamp
• Open or shorted Oil Change Lamp harness
• Poor electrical connection in the Oil Change Lamp circuit
• Faulty Powertrain Control Module (PCM)
• Other potential causes not listed

To diagnose the B1377 code correctly, it is important to avoid common diagnostic mistakes. These may include overlooking loose or corroded connectors, not thoroughly inspecting the wiring harness for damage, or failing to check for broken or pushed out connector pins.

To prevent the B1377 code from occurring again, you should follow these steps:

1. Check the Possible Causes listed above and address any issues accordingly.
2. Conduct a visual inspection of the related wiring harness and connectors, looking for any signs of damage.
3. Ensure that all connector pins are intact, not bent, and free from corrosion.

What Tools are Needed to diagnose

To diagnose the B1377 code, you will need specific diagnostic tools. Here are the common tools required:

1. OBD-II scanner: This tool accesses the vehicle's onboard diagnostic system and retrieves the trouble codes stored in the PCM. It helps identify the specific issue causing the B1377 code.
2. Digital multimeter: This tool measures electrical voltage, resistance, and continuity in the wiring harness and connectors related to the Oil Change Lamp circuit. It helps determine if there are any open circuits, shorted wires, or poor electrical connections.
3. Wiring diagram: This tool provides a visual representation of the electrical system, helping technicians trace and identify any faults or anomalies in the wiring harness and connectors.

Here are some tips for diagnosing the B1377 code:

1. Start by using the OBD-II scanner to retrieve the trouble codes and freeze frame data. This information can provide valuable insights into the conditions present when the code was set.
2. Visually inspect the wiring harness and connectors for any signs of damage or corrosion. Repair or replace any damaged components as necessary.
3. Use the digital multimeter to test the voltage, resistance, and continuity in the Oil Change Lamp circuit. Pay close attention to any readings that deviate from the manufacturer's specifications.

How to fix Step by Step

Step 1: Check the possible causes listed in the article, including a faulty Oil Change Lamp, an open or shorted Oil Change Lamp harness, a poor electrical connection in the Oil Change Lamp circuit, or a faulty Powertrain Control Module (PCM).

Step 2: Visually inspect the related wiring harness and connectors for any signs of damage. Pay attention to broken, bent, pushed out, or corroded connector pins.

Step 3: If the Oil Change Lamp needs to be reset, follow the instructions provided by the vehicle's manufacturer.

Step 4: If the Oil Change Lamp harness is found to be faulty, it will need to be replaced.

Step 5: Be sure to use the correct replacement harness for your specific vehicle make and model.

What are the Common Diagnosis Mistakes

Common diagnosis mistakes can occur when troubleshooting the B1377 code. To avoid these mistakes, it is important to approach the diagnostic process with caution and attention to detail. Here are some common mistakes that technicians may make when dealing with the B1377 code:

1. Not properly inspecting the oil change lamp: The oil change lamp can be a possible cause of the B1377 code. Technicians should thoroughly inspect this component and ensure it is working correctly.
2. Neglecting to check the wiring harness and connectors: The wiring harness and connectors related to the oil change lamp may be open, shorted, or have a poor electrical connection. It is crucial to inspect them thoroughly to identify any issues.
3. Overlooking other potential causes: Although the possible causes of the B1377 code are listed, it is important not to overlook other potential causes that may not be mentioned. Technicians should consider all possibilities and conduct a comprehensive diagnosis.

What is the Repair Cost

The repair cost for the B1377 code varies depending on factors such as location, vehicle make and model, and engine type. Common repairs may include checking the oil change lamp for faults, inspecting the harness for open circuits, and examining the circuit for poor connections.

Regular maintenance and timely oil changes can help prevent costly repairs.

Can I drive safely with this code?

Driving safely with the B1377 code is not recommended. Ignoring this code can lead to damage to your engine and other critical components.

It is important to address the B1377 code as soon as possible to ensure the longevity and performance of your vehicle. Continuing to drive with the code can create potentially unsafe driving conditions.

Conclusion

In conclusion, the B1377 code indicates a potential issue with the Oil Change Lamp. Common symptoms include the Engine Light being on or the Service Engine Soon Warning Light being illuminated.

The causes can include a faulty Oil Change Lamp, wiring harness issues, poor electrical connections, or a faulty PCM. It is important to visually inspect the wiring harness and connectors for damage and check for any broken or corroded pins.

The cost to diagnose and resolve this code can vary depending on various factors.