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Gary
Gary, ASE Certified Technician
Category: Chevy
Satisfied Customers: 742
Experience:  Senior Technician
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I just replaced the ECM and the BCM on my 03 chevy

Customer Question

I just replaced the ECM and the BCM on my 03 chevy silverado. When you go to start it no security light comes on, it cranks and puffs almost like it wants to start but wont. My scanner wont communicate with the pcm at all which is why i think its an electrical problem. I checked all of the fuses and relays and they all work. Any ideas?
Submitted: 4 months ago.
Category: Chevy
Expert:  Gary replied 4 months ago.

Hi there,

Can I ask why you replaced a PCM and a BCM at the same time?

If replacing any module, it would be normal practise to reset it to unlink it from the vehicle, replace that module, SPS program it to the vehicle, etc.

Did you do this to each module?

Did either one work prior to adding the other?

Gary

Customer: replied 4 months ago.
They are both programed to my vin. I changed the pcm dirst and it was the same problem and when i looked at the board on the bcm it was fried. When i tell you why your going to laugh but ive never had a problem welding before but i guess it just takes once right. I was welding new plates on the frame and I accidently hit the body with my arc and I just heard a pop.
Expert:  Gary replied 4 months ago.

Ok, sorry to hear that, and I'm not laughing, I have seen it before, happens to many people.

How did you program the modules? Via TIS2WEB?

During BCM replacement, is there different options for new PCM as well etc?

Keys were programmed?

Gary

Customer: replied 4 months ago.
Well at least I am not the only one then. I do not know I had ordered them from Rock Auto with my VIN and Milage. Does the key need to be reprogramed?
Expert:  Gary replied 4 months ago.

I would prefer to have both modules programmed by a Chevy dealer.

Did you link the modules together?

The keys would need to be programmed.

Please don't be upset about this, I have seen the results of welding many times.

We had one car that we could not eliminate an engine code that would keeping relogging.

Eventually worked out the frame had been electromagnetized from welding.

I hope my advice has been of assistance to you.

Gary

Customer: replied 4 months ago.
It has just been a very expensive mistake. About how much would it cost to have gm reprogram them? Also, how would I go about linking them together and reprograming the key? Thank you.
Expert:  Gary replied 4 months ago.

If you have fitted everything already I would say 2 hours of programming setup will have it running.

The GM programming tools are the best way to do any of this.

Do you have a GM dealer nearby?

Gary

Customer: replied 4 months ago.
I do. Would they be able to program the key as well? And could I just bring the boards there or will I have to get my truck towed there?
Expert:  Gary replied 4 months ago.

You need to take the vehicle with the modules, preferably fitted, but ok if not fitted.

And all keys, preferably at least 2.

So that does mean towing it there on a truck.

I have done this a few times for smash repairers etc.

Gary

Expert:  Gary replied 4 months ago.

Hi again,

Have you made any progress with your problem?

I hope my advice has been of assistance to you.

Kind regards

Gary

Customer: replied 4 months ago.
thank you. Im trying to see if gm has a service that can come to me but I did also discover that my starter was not spinning. One more question though, I know you will advise me against it but is there a way to perminatly disable the passlock system? I have been stranded because of it before and would really not like that to happen again?
Expert:  Gary replied 4 months ago.

The starter not working will be because the programming hasn't been done yet.

I have done this sort of job a few times to save large towing fees for customers.

You might find a dealer who is willing.

There may be a tuner out there who can disable the passlock, but I advise to get it running from the GM programming platform.

Hope it works out for you soon.

Kind regards

Gary

Customer: replied 4 months ago.
I tried jumping out the starter, I guess if you send 90 amps through it it may not work. Thank you.
Expert:  Gary replied 4 months ago.

Oh ok, you have hurt the starter motor as well?

Sorry to hear that.

Gary

Expert:  Gary replied 4 months ago.

Hi again,

How have you gone with this problem?

Have you had a dealer sort it for you?

I hope my advice has been of assistance to you.

Kind regards.

Gary

Customer: replied 4 months ago.
No, work has been really busy lately with the heat wave but I will keep you posted. Thank you.
Expert:  Gary replied 4 months ago.

You are welcome.

Try and stay out of the heat.

Gary

Customer: replied 4 months ago.
If I am not getting spark to cylinder 1 is there a way to jump a spark to the spark plug from the battery?
Expert:  Gary replied 4 months ago.

Hi again,

Have the modules been replaced by the dealer?

Does the engine run now?

No you cannot get spark from the battery, how many more components do you want to blow up?

Gary

Customer: replied 4 months ago.
Okay well the usless guys at chevy just called me and said that they reflashed it but it starts and then shuts off and that they cant diagnos it. Do you think it could be the cam or crank pos. Sensor?
Expert:  Gary replied 4 months ago.

That's disappointing if they can't diagnose it.

It should log a code if it starts then shuts down.

It won't be a cam or crank sensor doing that.

I have had 2 customers cars that had issues after welding done on them.

Gary

Customer: replied 4 months ago.
What was the problem on their cars? I dont really think they cared to look that much anyway when I dropped it off they were all very rude and no help whatsoever.
Expert:  Gary replied 4 months ago.

Both similar faults on a Cruze.

Engine light, falsing camshaft codes.

I hate rudeness, that gets people nowhere.

I do hope they can sort it for you.

Are they still looking at it now?

Gary

Customer: replied 4 months ago.
No they said pay me for reprograming it and get it towed back. But I was wondering if my ground strap on the firewall that grounds to the block was shorted could that cause it to start and stop?
Expert:  Gary replied 4 months ago.

I would think they should be a little more helpful.

A poor ground could cause this, but the dealer should be able to find things like that.

Gary

Customer: replied 4 months ago.
I will never be using that Chevy dealership ever again.
Expert:  Gary replied 4 months ago.

Have you got your vehicle back now?

Do you have another dealer nearby?

Stupid of the dealer to not help you, now they lose yourself and your circle of friends etc.

Gary

Customer: replied 4 months ago.
Im getting it back today. I read online of a few other people having this same problem and it turned out to be the passlock sensor which has already given me problems in the past but I had never changed it so I was going to change that and check the ground.
Expert:  Gary replied 4 months ago.

The dealer has done all the programming for you?

I can't understand how they can't work why it now runs then stops.

I think they have forgotten part of the key programming sequence.

Let's hope the next dealer may help you.

You can try the sensor, but I'm still dubious, since your dealer doesn't know.

Embarrassing for them.

I'm sorry I can't offer much more at the moment.

Gary

Customer: replied 4 months ago.
I just dont think that they take very much pride in their work. I will keep you updated though so that if you run across someone else with the same problem you can give them a starting point. Thank you though.
Expert:  Gary replied 4 months ago.

They must not have any 'big guns' working there.

I love jobs like this, because the young guys have no clue about it.

If the question times out, come back with a new question if you need to.

Kind regards

Gary

Customer: replied 3 months ago.
Hi, I noticed that the bcm they sent me has the same part number but the boards look different, have different numbers on them and the board came with plugs but the plugs it came with have the wires in different terminals than on my truck. Should the board still work or should I look for a bcm with the same board numbers rather than the part number?
Expert:  Gary replied 3 months ago.

That is interesting and unusual.

I don't like the sound of that either.

Have you queried the dealer about that?

Have you looked around for another BCM in a wreckers yard etc?

Gary

Customer: replied 3 months ago.
I was going to call a different dealership tomorrow. I have 2 new boards with the same part number but different boards. Do I have to match the serial number as well?
Expert:  Gary replied 3 months ago.

Yes, try another dealer, tell them what has been done so far.

They might know what to do.

If the part numbers are the same, they should be the same.

The serial numbers are individual numbers to each assembly.

Customer: replied 3 months ago.
By any chance would you happen to have a diagram of a steering columb you can send me? I figured while it was like this I was going to change all of the joints.
Expert:  Gary replied 3 months ago.

I think you mean the upper and lower shafts, so I have attached what you need here.

How are you going with the BCM issue?

I hope this helps.

Gary

Customer: replied 3 months ago.
Its going. Someone my father used to work with said he specifically works on the computer problems on cars so Im going to ask him to take a look. Thank you, ***** ***** you also have a diagram of all of the springs, bearings, retaining clips behind the steering wheel? Thank you so much once again for all the help you have been.
Expert:  Gary replied 3 months ago.

Are you wanting to replace the steering column?

There are a few special tools required to disassemble the column assembly.

Here is the removal procedure.

I hope this may help you, and I hope my advice has been of assistance to you.

Kind regards

Gary

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