B2110 OBD-II Trouble Code: Front Wiper Motor Relay Circuit Open

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Cost of diagnosing the B2110 code

B2110 is a diagnostic trouble code (DTC) for "Front Wiper Motor Relay Circuit Open". 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
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Toyota$20.00
BMW$20.00
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B2110 code definition

The B2110 trouble code detects a circuit failure in the front wiper motor relay.

What the B2110 code means

The B2110 code is a standard OBD-II body trouble code that signals a front wiper motor relay circuit error. The wiper relay is an important part of the front windshield wiper system, and essentially acts as a switch for the wipers. When the windshield wiper switch is set, the wiper relay is used to turn on the wipers to a predetermined setting. If the wiper control module at any point detects an abnormal voltage reading from the front wiper motor relay circuit, then it is likely that the B2110 trouble code will be detected.

What causes the B2110 code?

The B2110 trouble code may be caused by a few different problems, such as:

  • Defective front wiper relay
  • Damaged front wiper relay circuit
  • Damaged electrical components in the front windshield wiper system
  • In very rare cases, a malfunctioning wiper control module or powertrain control module (PCM)

What are the symptoms of the B2110 code?

Vehicles that have a stored B2110 trouble code will likely experience front windshield wiper failure. In some cases, the wipers will still work, but only at one speed. In other cases, the wipers may only work intermittently. And in many cases, the wipers will not work at all, regardless of the setting. It is also common for the check engine soon Warning Light to illuminate on the vehicle’s instrument panel when the B2210 code is detected.

How does a mechanic diagnose the B2110 code?

The B2110 code will be diagnosed with the help of a standard OBD-II trouble code scanner. A reputable technician will hook up the scanner to view the freeze frame data and gather information about the B2110 code. The scanner will also be used to look for additional trouble codes which, if detected, will need to be diagnosed in the order that they appear in. The trouble codes will then be reset, the vehicle restarted, and the B2110 code checked for. If the code is no longer present, then it was likely the result of an intermittent error, or an erroneous detection.

If the B2110 code remains present, then a visual inspection should be performed on all of the electrical components in the front windshield wiper system. Any shorted wires, open or corroded connectors, or blown fuses will need to be replaced. After checking these electrical parts, the circuit voltage will be tested, and then the front wiper relay will be carefully inspected.

When any parts are replaced or repaired, the inspection will be paused while the codes are again reset, the vehicle restarted, and the B2110 code checked for again. This will inform the mechanic as soon as the issue is resolved.

Common mistakes when diagnosing the B2110 code

The most frequently made mistake when diagnosing the code comes from a failure to abide by the OBD-II diagnosis protocol. Mechanics should follow the protocol at all times, step by step, to help guarantee accurate and efficient inspections.

It is common for defective electrical components to be overlooked, which can result in the unnecessary replacement of fully operational front wiper relays.

How serious is the B2110 code?

A vehicle with the B2110 code will still be drivable, and will not experience any drivability issues. The front windshield wiper system will likely not perform properly, however, which may result in erratic operation, being stuck on one setting, or an inability to work at all. Windshield wipers are an important safety feature, so the vehicle should not be driven in the rain, snow, or mist until the vehicle has been diagnosed and repaired.

What repairs can fix the B2110 code?

Repairs for the B2110 trouble code are:

Additional comments for consideration regarding the B2110 code

The B2110 trouble code is a manufacturer specific code. Manufacturer specific codes have meanings that can vary depending on the automaker, so while this code represents a front wiper motor relay circuit error for some cars, it may detect a very different body issue in other vehicles. Mechanics should take into account the vehicle that is being inspected when diagnosing the B2110 code.

Need help with a B2110 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 1-800-701-6220.

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