Skip the auto shop - Our mechanics make house calls

Q: No crank no start no communication with BCM

asked by on

No crank no start replace ignition switch and lock cylinder, did relearn and still no crank

My car has 117592 miles.
My car has an automatic transmission.

A: Does your vehicle have power on the purple ...

Does your vehicle have power on the purple wire at the starter? If you have power on the purple wire during cranking you likely have a faulty starter. If you have no communication with the body control module (BCM), the most likely cause is a faulty BCM. These vehicles are known for having bad BCMs. Unfortunately the BCM will need to be setup with a factory scan tool. If you'd like, a certified YourMechanic technician can come to your home or place of business to help you perform a Car is not starting Inspection and diagnose this issue.

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・Save up to 30%

Get a quote

What others are asking

Q: Car cuts off while driving after sitting for a few hours cuts back on check engine light comes on but does not stay on

Hello there, faults such as this can be a bit difficult to diagnose. When the cars cut off like this but then starts fine when they cool off, it points to a part that is failing once it gets hot...

Q: How do I accept a phone call?

When a paired device receives a phone call through the infotainment system, the sound system will be muted, and you will hear a ring through the sound system. To accept the phone call, rotate the MENU/SEL knob to Answer, then...

Q: Car shaking

The car shaking is likely from a motor or transmission mount, but you could be having other issues, such as an engine misfire. I recommend that you have a mechanic, such as one from YourMechanic, run a diagnostic check of...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.