5 Signs That Body Control Module Isn’t Working and Replacement Cost

Complex communication networks are essential for today’s automobiles to function properly. Many different computer modules are connected to various terminals, wires, and sensors in this network. Most of the time, each vehicle’s networks have a computer module that controls them.

The BCM, or body control module, is one example of a module that may be found in nearly all modern vehicles. Safety and comfort-related functions are supported by this module that has a significant impact on a vehicle’s driver and other passengers.

If the vehicle’s body control module has serious operational faults, it may fail completely. Several problematic symptoms may emerge as a result of this, many of which can be extremely troubling to deal with.

It is important to know what to do if your body control module fails, so please continue reading for more information.

What is a Body Control Module, and how does it work?

One of the primary functions of a vehicle body control module (BCM) is to monitor and control the vehicle’s many body-related systems.

The body control module of a vehicle is responsible for a variety of tasks, depending on the type. There are a few exceptions to this, such as when the wipers are on or when the vehicle’s BCM is activated.

When a car has multiple control modules, one of them is responsible for communicating with the rest of them. Communication between the vehicle’s critical systems can now be streamlined for more efficient and trouble-free operation.

What is the location of a Body Control Module?

The body control module is typically located under the dashboard in the vast majority of automobiles. Most modules of this type may be found within a short distance of this location, making it a pretty standard setting.

It is, however, important to note that the location of the BCM (driver/passenger) differs from car to vehicle.

Accessing the BCM may necessitate disassembling the dashboard and surrounding trim to some extent. Fortunately, many dash-related components are assembled with little more than push-style clips, so doing so is rarely difficult.

5 Signs and Symptoms of Faulty Body Control Module

The body control module might fail for a variety of reasons. However, some of these symptoms are significantly more common than others, but it is crucial to be familiar with each in the event that you are ever confronted with a fault of this type.

When a body control module fails, these 5 are the most prevalent symptoms:

1) Constantly Battery Draining

A parasitic draw is a symptom of a failing body control module that involves repetitive, excessive battery drain.

The parasitic pull allowed by a BCM malfunction can drain a battery in hours whereas a small amount is acceptable. When a BCM continues to give power to a certain accessory at inopportune times, this draw happens.

2) Inconsistent Electrical Function

Intermittent activation of electrical features, such as the vehicle’s horn, lights, and wipers, can also be caused by a faulty body control module.

A faulty body control module can be identified by the wild sweeping of the instrument cluster dials, as well as by the erratic working of the door lock and radio. When more than one of these symptoms is present at the same time, the likelihood that the problem is caused by the BCM increases.

3) Deficiencies in the security system

The body control module is nearly always responsible for operating a vehicle’s security system. Because of this, it’s simple to conclude that a vehicle’s security system is plagued by a broken or failing body control module.

Problems with a vehicle’s keyless or passive entry system can also fall under this category.

4) Warning Lights on the Dash

The instrument panel of a car might be seriously damaged by a malfunctioning body control module. A dash display that would normally be uninteresting can be transformed into something that looks like a Christmas tree in an instant.

The transmission control module, the powertrain control module, or the airbag control module may not be able to interact with a BCM when this occurs.

5) Failed to Start

In some situations, a malfunctioning or non-functioning body control module might prohibit a vehicle from starting.

If a defective BCM fails to detect the transponder chip in a key, or if it fails to provide a “start” signal from a vehicle’s ignition switch, the starter will not activate.

The BCM’s inability to communicate with other control modules can also cause difficulty in starting the vehicle.

Is it Possible to Drive With a Faulty BCM?

Although theoretically conceivable, it is not recommended to operate a vehicle with a defective body control module. This is due to the unpredictable nature of a failed computer module.

On any given day, it is impossible to predict which of a damaged computer’s functions would work as expected. BCM failure can’t be predicted because it’s hard to know whether or not a safety-related issue would occur from its failure.

This doesn’t mean that a defective BCM will never fail to turn on the lights of a vehicle when it’s supposed to. The occupants of a car are at risk because of this.

Replacement Costs for Body Control Modules

The cost of replacing a body control module varies widely depending on the brand and model of the vehicle. This is due to the fact that the cost and time required to repair different body control modules varies.

But below is a breakdown of the costs associated with replacing the body control module.

The replacement of a body control module typically costs $300-$600 on average. The most important factor in this price is the cost of the failing module.

Due to a lack of available modules in the current market, shipping costs involved with discovering and purchasing these parts can have an impact on repair prices.

Is it possible to reset a BCM (Body Control Module)?

In some cases, a vehicle’s BCM can be reprogrammed to work properly again. Internal circuitry must be working properly for this to work, as a reset cannot fix a malfunctioning circuit.

If your vehicle’s BCM is malfunctioning due to a “glitch” of some kind, a reset may be the only solution. The technique for resetting a car’s body control module varies from vehicle to vehicle.

Most of these processes include removing power to a vehicle’s BCM for a predetermined amount of time, however, Ford, Dodge, and Chevy/GMC all have their own protocols.

Many vehicles may simply be disconnected from the battery, while others require the removal of a specific fuse.

Before attempting to reset the body control module of your car, truck, or SUV, you should always reference factory-specific service information for your vehicle. If this isn’t done, the unit may suffer permanent harm.

5 Signs That Body Control Module Isn’t Working and Replacement Cost

Hi, this is Viney Bhatia, a blogger, an engineer, and your virtual mechanic. You'll get all the latest information about cars, reviews, tips, service methods, and various other things related to automobiles on our blog.

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