Symptoms of a Bad Body Control Module (BCM)

Common symptoms of a bad Body Control Module (BCM) and What to Check to see if it has failed.

What is a Body Control Module?
The body control module (BCM) monitors and controls electronics located in the body of the vehicle. This includes power windows, power mirrors, AC system, immobilizer system, central locking, lights, horn, wipers, and more. The BCM also communicates with other on-board computer modules such as the ECM.

Symptoms of a Bad Body Control Module (BCM)
Electrical Components Don't Work or Work Erratically
Dash Warning Lights
Battery Keeps Draining
Security System Problems
Failure in Driver Assist Systems
Communication Failure Codes (U0140)

Things Check with a Failed Body Control Module
Check Battery and Alternator are Good.
Check Fuses
Check BCM Ground Wire
Check Wire Harness for Damage
Check for Brunt Smell

By using this information user assumes all risk of use.

[Bthagreat]

I just found out about the BCM after buying and replacing a Tail light/ Brake light assembly just to have it do the same thing. My car had all those symptoms but I didn't understand how. Thank you for this video bro!

[lukegleason]

Very good video, almost all the lights and gauges on my dash either came on or stopped working all together. Spent the day just chasing wires and checking fuses but this sounds like the answer to my problem. Thanks!

[ekimsnevets]

My GMC Sierra 2500 HD has door locks clicking intermittently, ignition start function isolation, the rpm undulates up and down while cruising, cruise control light shows on but won’t set a speed and there is a check engine light. Already changed the brake switch 8 months ago and it cleared up. Now it’s back

[slugo]

Yep, having one ordered today. 2006 mazda 6 while lights is on if i use right or left turn signals the hazards come on! If i turn lights off the turn signals work like their supposed to. Also if i lock my doors with the key fob the hazards come on. My mechanic has one on the way. Just hopefully it won't need reprogrammed which will cost more. Fingers crossed.

[evangelistalexcar]

What about the emergency lights going on and off while I’m driving?

[Cycles_]

My radio doesn’t go on, my screen is off and the air won’t go off. 😢😢😢

[dafelogistics]

Thanks for the informative video. I have an urgent request concerning a problem with my truck. This is an International truck. The DEF, check engine and the triangle lights came on. I was asked to change the Turbo Actuator. Two days later, same lights came back on. This time around, my mechanic said it's the Body Controller Module. He said there's no communication between the BCM and the Turbo Actuator. There is no loss of power from the truck. The truck runs good even when those lights came on both times. Is this really the problem? If this is the problem, can I use a used BCM or I should just go ahead and buy a brand new one? Thank you

[tiffiegbabie]

Could a bad BCM make my air conditioner and radio go super loud every time I turn the key? Also can it make a brand new battery turn into a dead cell? I've gone through 3 new ones

[handymantoo]

So if the immobilizer key light is on and the dash lights for gear isn’t lit, the headlights won’t work and I can’t start the vehicle because I can’t get the immobilizer light off or dash lights to come on. Would I need Bcm or ecm and would I need to have it programmed to vehicle first. Or can dealership flash and reprogram my original if I take it out and to them to save a few bucks on tow

[TheLoner]

My bcm on my 19 f350 is getting replaced as I type. Some of the tpm sensors have to be replaced as well. My horn, lights, hazards, tpm, ebrake chime, door locks, tranny module etc started going nuts. $2200 so far. The harness connection had corrosion but it seems to be all right. What a pain in the arse.

[puffythecampfireplayer]

With the key out, I can still turn on the wipers, roll down windows, the headlights stay on, etc… So the battery draws a ton of power and will be dead in an hour or so. The dealer says I can’t get a new bcm and my vehicle rejected the salvage one I brought in. Now what????

[douglascarrier]

I have a 2006 pontiac grand prix..and my headlights keep coming back on by themselves when car is off and today I was locked out

[normaltedw]

Thanks - very helpful video! My 04 GMC Yukon has randomly exhibited the following crazy alarms, displays and behaviors: Seatbelts (when all are fastened), Tire Pressure Monitor, Service Stability Control. Once the key fob stopped unlocking and then was OK. Also the left turn signal was freezing without flashing and coming on (solid) with brake pedal. AutoZone read the following fail codes: C0196 Yaw Rate Circuit Malfunction and C0455 Steering Position Sensor Circuit Malfunction. Does all this sound like the BCM is the likely culprit? And if so, does a replacement have to be programmed by a dealer?

[willykrahn]

I have a 2019 ram 1500 limited i was driving the whole day and while driving al the lights came on the ac started to blow heat instead of cooling and the about 5 to 10 minutes the logo came back like if you turn the key on to start and then everything was back to normal it happens 5 times n 4 hour is the any body that could help me thanks

[Mejia]

Great information! I am having a problem with an 06 300C 5.7l. My headlights turn on for a second, and relay cuts both off.is that a bad bcm? No blown fuses.

[houstonbrown]

I replaced my bcm in 2019, now on 2024 same symptoms again, dim lights, all of my ground wires are tight, plus battery cables, when I put in park turn off engine, the speakers pop, sounds like bcm again, plus sluggish going up hill, at 55mpg plus, have new transportation 6 speed gmc 2500hd 6.0,

[ShannonNicholas-ybfo]

I have 2016 Chevy Silverado 2500 it shows all the signs you have described in your video of Bad BCM bought new one from Chevy dealership an asked them to program new one to truck they said had no communication to it my fuse box on passenger side has no power to it checked all fuses seem good need help is dealership just trying to get more money out of me

[weropfi]

I have 97seville the dashboard lights go on for a couple minutes gos off and the fuses are good

[curtismcnulty]

My 03 ford f150 won't start after a rain or humidity and the dash cluster lights go crazy

[cwollenzien]

2013 ram 1500 sport. All of those issues you talked about in your video. The truck wouldn't shut off so we unhooked to battery and after hooking it back up, pretty much no power to anything but the cab light, the side mirrors have power, the push start says off, headlights, tail lights, but no dash lights or power. If this is replaced, does it have to be programmed by a shop or dealer?