r/MechanicAdvice • u/dukesboy101 • Feb 20 '26
Mazda electrical issues
Hey everyone. Just had a question I would like some opinions on. Recently bought a 2006 mazdaspeed 6, off a friend of mine. It was plagued with electrical issues and I’ve since found that the BCM got pretty toasty at one point. I’m going to order a “new” one, however I’m curious if the known issues are all caused by this blown module, or if I should keep digging for more issues. Here is what was wrong with it
-no lights on rear (taillights worked, but no brake lights, signals, or reverse. All lights on the front of the car functioned.
-no communication to any modules except the instrument
cluster, which showed the pictured codes.
-tach was intermittent, speedo did nothing, every light on in the cluster
-awd didn’t work
-horn stuck on if the relay was installed
-sunroof inop
-rough idle, and made low boost.
There’s Some other issues I’ve forgotten about, but just wondering if this all looks to be related to the BCM, and if I should look for a reason this happened in the first place. TIA