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Ask Dr.Carz Your Own Question
Dr.Carz, ASE Certified Technician
Category: Chevy
Satisfied Customers: 303
Experience:  12 years in and still going
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I have a 2007 chevy 1500, the customer had it towed in no

Customer Question

i have a 2007 chevy 1500, the customer had it towed in for a no start condition. we checked the battery, it had a bad cell. we replaced the battery and continued in on our diagnosis. We put a Scanner on the car to check for codes and it read BCM no communication. we checked the fuse for the BCM and it was good. so we replaced the BCM and now were getting a no COMM for the AUX BCM. the Indicator does not have the indicator under what gear it is in. and the reverse lights are staying on.......
i took a known good shift module and put it on the truck to see if it fixed the indicator and it sitll did not work. I also have a NO COMM for the HVAC system
any help would be very much appreciated
Submitted: 1 year ago.
Category: Chevy
Expert:  Gary replied 1 year ago.

I am sorry your having this problem'was the new BCM programmed to the trucks vin number with a programming scan tool and the software installed in it ?

Customer: replied 1 year ago.
we replaced the BCM and it did in fact read now and it has been reprogrammed
if you can call me it would be easier(###) ###-####
Expert:  Gary replied 1 year ago.

so now the BCM communicates ?

does it physically crank over and just not fire up now ?

Customer: replied 1 year ago.
the BCM is communicating
no it does not crank over.
if i jump the starter it will crank but not fire
Expert:  Gary replied 1 year ago.

key ON the check engine light is lit up the dash ?

Customer: replied 1 year ago.
the CEL does illuminate. it tells me that the aux BCM is not communicating
the codes were u0073, u0140
Expert:  Dr.Carz replied 1 year ago.

Just a thought. Was the truck jump started and by chance even for a second did the jumper cables get put on backwards? If so then I would say replace the under hood fuse box if not try removing the under hood box and spraying out all the connectors with contact spray and then apply di-electric grease and see what happens. Good luck hope this helps I was just reading through and had this thought.