B2107 OBD-II Trouble Code: Front Wiper Motor Relay Circuit Short to Vbatt

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

Red stars EXCELLENT RATING ON

Cost of diagnosing the B2107 code

B2107 is a diagnostic trouble code (DTC) for "Front Wiper Motor Relay Circuit Short to Vbatt". 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 for $154.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $50.0 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 $154.99 $50.0
Toyota $154.99 $50.0
BMW $164.99 $50.0

*Estimates may vary by market

SCHEDULE B2107 DIAGNOSTIC Get a fair and transparent estimate upfront

B2107 code definition

The B2107 trouble code notes a front wiper motor relay circuit failure.

What the B2107 code means

The B2107 code is a generic OBD-II body trouble code that detects a circuit error in the front wiper motor relay. The wiper motor relay acts as a switch for the vehicle’s front windshield wipers, and allows the wipers to operate at a predetermined speed. When the wiper control module receives an abnormal voltage reading from the front wiper motor relay circuit, then the B2107 trouble code may be stored.

What causes the B2107 code?

There are a few different issues that can cause the B2107 trouble code to be stored:

  • A damaged relay circuit
  • Damaged electrical components in the front wiper system
  • Failed front wiper relay
  • In rare cases, a defective wiper control module or powertrain control module (PCM)

What are the symptoms of the B2107 code?

When the B2107 trouble code is detected, it is likely that the front windshield wiper system will not operate properly. The wipers may work only intermittently, or they may not work at all. In some cases, the wipers may only work at one speed, and will not be adjustable. The code may also be accompanied by an illuminated check engine soon Warning Light on the vehicle’s gauge cluster.

How does a mechanic diagnose the B2107 code?

The B2107 code will be diagnosed using a standard OBD-II trouble code scanner. A certified mechanic will use the scanner to view the freeze frame data and assess the B2107 code, while also checking to see if any other trouble codes have been detected. If the technician notes multiple present codes, then they will need to be addressed in the order that the scanner displays them in. The codes will then be reset and the vehicle restarted, so that the B2107 code can be checked for again. If the code is no longer present, then it was likely inaccurately detected, or is the result of an intermittent issue.

If the code remains present following the reset, then the electrical components in the windshield wiper system should be visually inspected, and any shorted wires, open connectors, or blown fuses will need to be replaced. The voltage to the circuit should then be tested, followed by an inspection of the front wiper relay.

After any components are repaired or replaced, the trouble codes will once again be reset, the vehicle restarted, and the B2107 code checked for again. By doing this, the technician will know as soon as the problem is fully resolved.

Common mistakes when diagnosing the B2107 code

The most commonly made mistake when diagnosing the B2107 code comes from a failure to properly adhere to the OBD-II trouble code diagnosis protocol. It is imperative that mechanics follow the protocol step by step at all times, to ensure thorough and efficient diagnoses, and accurate repairs.

Oftentimes fully functional front wiper relays are replaced because damaged electrical components were overlooked.

How serious is the B2107 code?

The B2107 code will not keep a car from being drivable, or present any drivability concerns. However, the windshield wipers will likely not work properly. The wipers may be erratic, or not work at all, which can cause both practicality and safety concerns when driving in wet conditions. When the B2107 code is detected, an inspection should be scheduled, and the vehicle should not be driven in rain, snow, or mist.

What repairs can fix the B2107 code?

Repairs for the B2107 trouble code include:

Additional comments for consideration regarding the B2107 code

The B2107 code is a manufacturer specific trouble code, which means that the definition can vary depending on the automaker. In many vehicles the B2107 code represents a front wiper motor relay circuit error, but in other cars this code can detect an entirely different body issue. As is always the case, the mechanic should take note of what car is being worked on when diagnosing the B2107 trouble code.

Need help with a B2107 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.

Check Engine Light
wipers
trouble codes
B2107

No more waiting rooms! Our mechanics will come to you to diagnose and fix the B2107 code.

SCHEDULE B2107 DIAGNOSTIC
Get a $50 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(8600)

Rating Summary
8017
273
65
46
199
8017
273
65
46
199
 at YourMechanic

Brandon

9 years of experience
133 reviews
Brandon
9 years of experience
Ford Escort L4-2.0L - Check Engine Light is on - Nashville, Tennessee
Brandon showed up ahead of schedule, was very personable and diagnosed my problems. He also scheduled my next appointments which will be with him.
 at YourMechanic

William

23 years of experience
33 reviews
William
23 years of experience
Lexus IS250 V6-2.5L - Check Engine Light is on - Mableton, Georgia
Arrived early which was great. William was courteous, and attentive to the issue. Even though it took several attempts I'm so happy he was determined to fix it and he did!
 at YourMechanic

Dan

40 years of experience
1080 reviews
Dan
40 years of experience
Plymouth Grand Voyager - Check Engine Light is on - Lawrenceville, Georgia
Mr. Dan Barber was quite patient, courteous and quite knowledgeable. From my observation, Mr. Barber appears to be quite professional.
 at YourMechanic

Christopher

9 years of experience
120 reviews
Christopher
9 years of experience
Ford Fiesta L4-1.6L - Check Engine Light is on - Smyrna, Georgia
Chris communicated with us each step of the way up until his arrival. He listened well, was knowledgeable, and was prepared. He took the time to diagnose the problem, explained the what, why and how and provided a solution. I would definitely recommend him and will use him again.


More related articles

P2765 OBD-II Trouble Code: Input/Turbine Speed Sensor B Circuit
P2765 means the system is receiving a bad or no signal from the input/turbine speed sensor B due to faulty sensors or solenoids or electrical issues.
P0880 OBD-II Trouble Code: Traction Control Module (TCM) Power Input Signal
P0880 means that the TCM communication circuit is not communicating with the PCM due to a malfunction in the activation switch.
P0788 OBD-II Trouble Code: Shift/Timing Solenoid High
P0788 means that the ECM has detected a high voltage from the timing solenoid valve (TCM) terminal due to low or dirty fluid, or shorted solenoid.

Related questions

Windshield wipers not working
Hello. The first thing to check with any electrical device is to check the fuse. If the fuse is blown, replace it and try the wipers again. If the wipers work, then you are set to go. If it blows...
My car won't move when i press the gas pedal i have never had a problem before. I did notice a leak but i thought it was the oil from the transmission.
You should check for any codes that could be stored in the ECM (computer) as the check engine light is on. This will give you a starting place to check for the condition that you are having. Since the vehicle...
Was does system too lean bank 1 and bank 2 mean?
If you have codes stored in the engine computer for lean bank 1 and 2 is caused by the entire engine is running lean. This is caused by not enough fuel getting into the engine or too much unmetered air...

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 (855) 347-2779 · hi@yourmechanic.com