Question about 2003 Cadillac CTS

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2003 cadillac cts after the ecm was replaced the car will not start all the time

My ECM was replaced on my car. It is still in the shop and they told me the starter is going out because it doesn't start all the time. Could that possibly be from the ECM and not the starter.

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If the ECM was replaced properly it have no efffect on the engine starting. If the starter is turning the engine over then it's doing all it was designed for. I think I would get it out of that shop. I smell a rat over the internhet.

Posted on Oct 27, 2012


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SOURCE: I have an cadillac Cts 2003 with starting problems

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SOURCE: 82 Cadillac ECM wiring diagrams/ troubleshooting

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SOURCE: 2003 cadillac cts v6 3.2 liter. white smoke

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SOURCE: ECM replacement for an '05 Cadillac CTS 3.6L

I was reading through the replacement procedure for the ecm in your vehicle.Here`s what I may use a used ecm but it does have to be reprogrammed to your vehicle and it can only be done at the dealership.This I know because I worked at a Cadillac and G.M. dealership.I worked at a dealership for 16 yrs.The other thing is you don`t` need the vehicles vin that the used computer came from.The only one you need is your vin number.This number has all the information that your car is equipt with.The used ecm will have the other vehicles fuel continue password so the programming will put in the fuel continue from your vehicle.The other thing that needs to be programmed is the engine oil life and the transmission oil life or they revert to 100%.Then an idle relearn procedure will have to be performed.The only thing any other shop can do is get the codes or clear the codes.But they can not program a computer.Only the authorized dealerships have this software.Hope this helps clear up your any questions.Good luck.

Posted on Dec 22, 2009

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We have a 1994 Mitsubishi 3000 gt 5 speed and was told the ecm and starter are bad but could be a ground wire. How do we check this and how do you replace ecm?

First thing is to check the cheapest bit first. The ground wire (earth wire) was mentioned and as this wire controls all the electronics I would spend time ensuring that it is in good condition . tight and fixed to a clean -non-rusted --surface . Ensure battery terminals and posts are shiny clean and tight . Now if the battery has a dead cell then it indicates a starter problem. However a simple test with a load tester on the battery will show up where the problem may be.. Lastly the ECM may be tested at an auto electrical shop or tested with a known reliable spare replacement unit

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Sounds like a starter that is in the 1st stages of death : ) Starters don't just die, (usually) they kinda die a long agonizing death, agonizing for you cuz most of us tend to push it and hope that it just keeps going, Forget it! It's dead replace it and move on. : ) I would def change out the starter though. That'll probably solve your problem. Good luck.

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Told starter was out, vehicle does not turn over at all. how do i replace starter

Can not go by something your told, unless
a repair shop had it on the lift & diagnosed it

Could be several things in starting system

Basic hand tools to remove it

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You may be right. Sometimes a starter test doesn't reveal everything. But before you pull the starter, do this quick test. It should confirm if problem is the starter or the ignition switch. When the car won't crank over, pull the small wire off the starter solenoid (on the starter), and check if it has power when key is held in crank position. You need a helper to hold the key in crank. If the wire has power (use a testlight or meter to check for power), and the starter won't crank, pull the starter off for testing or replacement. But if there is no power on the wire when key is held in crank, then it confirms that power is not being transmitted from the switch to the starter. Not to say for sure it is the switch, could also be another part in the path from switch to solenoid (like the neutral safety switch). But more common for the ignition switch to go out first. Either replace the switch or continue testing your start circuit. Post back with results or for further help. Good luck.

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How expensive & complicated to fix a brain in 2000 saturn lw2 wagon?

Unless you were on this site months ago,I do not see
where you stated what problems you were having with
the car

The ECM/PCM doesn't fail often. There is no such thing as
a brain. What you have is a combined Powertrain Module,
that controls both engine & transmission functions, in an OBD2
1996 & later vehicle,vs: prior OBD1 Systems, that used an ECM
& body BCM, as Gm did decades ago.

Everything above you were told is true

You could get a salvage yard Pcm
You could & should buy a factory cleaned
& tested, reconditioned one.

You should have it flashed with current updates
& unless you had a way to know what it came out
of,then it will have to be flashed (programmed) to
work with your vehicles systems,as it was built

None of the discussion should be your concern
You need to have the car properly diagnosed first

A repair shop is cheaper than a dealer

Some repair shops have the adapter to put between their
scan tool & the cable, to your under dash connector,that
is used to connect to the internet & flash your electronics,
if necessary

The issue is,as you were told, to flash a Pcm, you need to
buy a one time licence from the MFG. So usually the dealer
is the first choice. Ten years from now, an apprentise mechanic
will be doing it & the cost will be $50.00 per car,were as it may be
several hundred now, for a one time licence for one car.

Your way beyond a solution at this point

If you have in fact had the vehicle checked over by different
repair shops & dealers and there is no definitive answer that
please you,your at a cross road.

If no money has been spent to speek of,then you have to
decide what's next

I would start fresh & find out what does work well & what doesn't

Again, I doubt the PCM is bad.
If it come to that you know enough to buy a reman,try it out,
scan the system,professionally,& see if it needs to be flashes

Your going $500.00 to a $1000.00 no matter what,unless
everyone missed a simple corroded wire terminal or a $40.00

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