B1377 OBD-II Trouble Code: Oil Change Lamp Circuit Failure

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the B1377 code

B1377 is a diagnostic trouble code (DTC) for "Oil Change Lamp Circuit Failure". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE B1377 DIAGNOSTIC Get a fair and transparent estimate upfront

B1377 code definition

The B1377 trouble code notes a malfunction with the oil change lamp circuit.

What the B1377 code means

The B1377 code is a standard OBD-II trouble code that detects a circuit issue with the oil change lamp. The oil change lamp is a warning light on the vehicle’s instrument panel that illuminates when the car should have the oil changed. This lamp is normally triggered when the vehicle has driven a certain number of miles. When the powertrain control module (PCM), body control module, or one of the many other control modules (such as the instrument panel control module) notes a circuit failure from the oil change lamp, then the B1377 trouble code will likely be triggered.

What causes the B1377 code?

A few different things can cause the B1377 trouble code to be stored:

  • Defective oil change lamp bulb
  • Faulty oil change lamp circuit
  • Damaged wires, connectors, and fuses in the controller area network (CAN) bus harness
  • In rare cases, a malfunctioning PCM, body control module, or CAN bus

What are the symptoms of the B1377 code?

When the B1377 trouble code is present, the oil change Warning Light will likely have issues. The lamp may illuminate even when the vehicle is not due for an oil change, or the lamp may not illuminate at all, even when it should. It is also possible that the lamp will blink repeatedly. In addition to oil change Warning Light failure, the check engine soon Warning Light may illuminate.

How does a mechanic diagnose the B1377 code?

The B1377 code will be diagnosed using an OBD-II trouble code scanner. A reputable technician can use the scanner to observe the freeze frame data for the B1377 code, and also to check for the presence of additional trouble codes. If there are multiple trouble codes detected, then they should be diagnosed in the order that they appear in. The mechanic will then reset the trouble codes, restart the vehicle, and check to see if the B1377 code remains present. If not, then an intermittent error, or an erroneous trigger are likely to blame.

If the code is still detected, then the technician will begin by visually inspecting the electrical components in the CAN bus harness. Any blown fuses, corroded connectors, and damaged wires will need to be replaced. If any of the electrical components appear to be damaged as the result of other issues (such as leaks), then a further inspection for the root of the problem will be required.

Next, the oil change lamp bulb and circuit will be inspected. If the issue remains, then a specialized CAN scanner can be hooked up to help pinpoint the problem.

After any replacements or repairs are made, the technician will need to reset the trouble codes, restart the vehicle, and again check for the presence of the B1377 code. By doing this, the mechanic will know as soon as the problem has been fixed.

Common mistakes when diagnosing the B1377 code

The most frequently made error when diagnosing this code comes from failing to properly follow the OBD-II diagnosis protocol. It is imperative that technicians abide by the protocol step by step, to help ensure efficient diagnoses, and avoid erroneous repairs.

It is common for functioning oil change lamp circuits to be condemned when a fuse or a wire was the only problem.

How serious is the B1377 code?

The B1377 trouble code won’t keep a car from being drivable, but it will likely prevent the oil change reminder system from operating properly. As with all trouble codes, when the B1377 code is detected, an inspection should be scheduled.

What repairs can fix the B1377 code?

Repairs for the B1377 trouble code include:

  • Oil change lamp bulb replacement
  • Oil change lamp circuit replacement
  • Replacement of the electrical components in the CAN bus harness
  • In rare cases, replacement of the PCM, CAN bus, or body control module

Additional comments for consideration regarding the B1377 code

The B1377 trouble code is a manufacturer specific code. This means that the definition of the code can vary depending on the manufacturer. While the B1377 represents an oil change lamp circuit failure for many vehicles, it represents a different problem for some makes and models. Technicians should always take into consideration the vehicle they are working on when diagnosing the B1377 code.

Control module failure is very rarely associated with the B1377 code, so all other potential causes should be thoroughly checked before controller damage is presumed. If a control module does require replacement, it will also require reprogramming.

Need help with a B1377 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
OBD-II
B1377

No more waiting rooms! Our mechanics will come to you to diagnose and fix the B1377 code.

SCHEDULE B1377 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

4,987

Rating Summary
4,593
191
48
28
127
4,593
191
48
28
127

Robert

12 years of experience
6 reviews
Robert
12 years of experience
Ford Fusion - Check Engine Light is on - Stockton, California
Robert was very knowledgeable and professional. He is also very friendly and likable individual. I’m very pleased and satisfied with his work.

Sonal

16 years of experience
19 reviews
Sonal
16 years of experience
Mercedes-Benz S550 - Check Engine Light is on - Federal Way, Washington
Sonal was very knowledgeable and took the time to explain each of the 50 point checklist thoroughly. Sonal definitely has an abundance of Mercwdes Benz experience regarding mechanical problems.

Daniel

20 years of experience
301 reviews
Daniel
20 years of experience
Chrysler Town & Country - Check Engine Light is on - Santa Fe, Texas
Daniel was on time and performed a 50 inspection for us. We now have a path forward for repair and will be scheduling Daniel to return and make the repairs.

Michael

15 years of experience
515 reviews
Michael
15 years of experience
Chevrolet Equinox - Check Engine Light is on - Woodstock, Georgia
Mike really knows his stuff. He took alot of time with me making sure I understood what was going on with my vehicle.


More related articles

B1955 OBD-II Trouble Code: Seat Front Up/Down Potentiometer Feedback Circuit Open
B1955 means there is a circuit failure related to one of the front seat's potentiometers, likely due to a faulty potentiometer or bad wiring.
B2106 OBD-II Trouble Code: Throttle Position Input Out of Range High
B2106 trouble code means there's a range issue with the throttle position input in a 4WD system, caused by a damaged circuit in the 4WD system.
B1270 OBD-II Trouble Code: Servo Motor Potentiometer Defrost Circuit Short to Battery
B1270 means there is a malfunction with the servo motor potentiometer defrost circuit, likely caused by a defective potentiometer or faulty motor.

Related questions

Throttle body error codes. Car still accelerates.

The codes should have cleared when the battery was disconnected. I would suggest driving the car as normal for a bit to see if they come back on. Chances are if the car is running normally, they have been cleared...

Intake maifold runner control is stuck open

Hello, thanks for writing in about your 2001 Mazda Miata. Due to this trouble code, the intake manifold runner control will need to be replaced. If this is not done you can cause serious damage to your car. If you...

The emergency brake is not working and multiple brake lights are on

The OBD-II error code P-0501 is a generic code that indicates an issue with the transmission speed sensor. This component is vital in the operation of the ABS and traction control system, which is probably why the light is illuminated....

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com