The national cost for a body control module replacement in 2023 is between $402 and $1286 with an average of $602​

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POPULAR VEHICLES

National average cost of a a Body Control Module Replacement
for popular vehicles:

Car Model

Avg. cost

$50

What is a body control module and how does it work?

The body control module, or “BCM”, is the heart of a modern vehicle’s electrical system for all components that are not directly linked to the powertrain. The BCM receives signals from most every switch and sensor in the body, frame, and interior of the vehicle, along with data from select other systems related to the engine and transmission. 

The BCM uses this data to operate components from the anti-lock brakes, cruise control, air conditioning, supplemental restraint system, anti-theft system, and many others. It also controls the lighting system, door locks, power seats, and proximity sensors. In short, there really is no electrical component on the body or frame that functions without a relationship with the BCM.

COMMON SYMPTOMS

How do I know if my vehicle needs a body control module replacement?

The body control module controls a wide range of components and systems in your vehicle. Unless it is a part of the engine or transmission, the BCM probably controls it or communicates with it in some fashion. Because of this, signs of a faulty BCM can number in the hundreds, and can be extremely difficult for technicians to troubleshoot and diagnose. Some of the more common signs of a faulty BCM are:

The check engine light comes on

Power windows, power locks, or power seats do not function properly

Air conditioning does not work as it should

Your engine will not start

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HOW IS THIS SERVICE PERFORMED?

How is a a Body Control Module Replacement done?

The body control module is often located inside a vehicle, beneath the dashboard or behind a kick panel. To replace the module, a technician will likely take the following general steps:



  • Remove any trim covers, panels, or ducts necessary to gain access to the body control module
  • Disconnect the wiring harness plug from the body control module
  • Unfasten the module from its mount
  • Remove the module and insert the new one
  • Re-attach the mounting screws and reconnect the wiring harness
  • Re install the components that were removed for access
  • Program the new body control module with a scan-tool to ensure compatibility with the rest of the vehicle
  • Verify the repair by test driving the vehicle and checking that all systems function normally

Other questions customers ask

Does a new body control module (BCM) need to be programmed?
Yes. When a technician replaces a body control module, it usually needs to be “flashed”, which is another way of saying that it needs to be programmed to the other vehicle systems before it will communicate and work properly with all of the other components.
Is it safe to drive with a bad BCM?
No. Driving with a bad BCM could mean driving without many of the vital systems on the vehicle functioning properly. For example, a malfunctioning BCM can prevent the supplemental restraint system (air bags), power steering, anti-lock brakes, and much more from working. Those systems are, of course, critical to passenger safety.
What causes a body control module to fail?
A body control module can fail if, for some reason (such as bad wiring, getting wet, or a faulty electrical component), it receives too much or too little voltage. Corrosion of its electrical contacts can have an effect as well. The BCM can also fail from physical damage in a crash.

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