Skip the auto shop - Our mechanics make house calls

Q: Suburban won't start with no interior lights at all

asked by on

My truck will not turn over or anything. No dashlights/radio/security telltale. I've tried about every fix I've found and haven't come up with anything. Before all this it would turn over but die within seconds and like an idiot I disconnected the bcm without disconnecting the battery and now I'm down to nothing happening. Did I fry my bcm?

My car has 174000 miles.
My car has an automatic transmission.

It is possible you did burn out the BCM. The BCM relies on grounds in the harness and when you disconnected it, you may have disconnected the wrong connector first and it will burn out the internal circuits of the BCM. I recommend having the system checked first to see if it can be scanned, and then diagnose any codes before replacing the module.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Engine swap from 327 to 1999 Vortec 350?

The engine swap should not be a problem. The problem you are going to have is the two wire harnesses and computers being different as this could make it more difficult to program each computer. You may not be able...

Q: Car just clicks. Tried a battery and starter and it still just clicks. Help?

Hello, thank you for writing in. Your vehicle may be having one of many issues. To begin, make sure your battery cables and the starter's cables are all clean, dry, and tight. You will then want to see if the...

Q: After repairs, clunk-type noise still persists

Hello. It sounds like you may have a problem with an axle shaft of the front differential in your truck. Also, make sure that you have the truck in 2WD, not auto 4WD or 4WD high. If you have it...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.