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Starter turns when I hook the battery backup on 07 Pontiac G5


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Fishbum656
New User

Sep 8, 2018, 2:05 PM

Post #1 of 4 (197 views)
Starter turns when I hook the battery backup on 07 Pontiac G5 Sign In

Hello,
I have a 2007 Pontiac G5 with a 2.2L Ecotec engine and automatic transmission.
My wife and I bought this car new in 07 and have just recently give it to our son. He was driving the other day when he stopped at the store. He tried to start the vehicle, but the starter just made clicking noises. (From the time he called me till the time I could get there he kept turning the key the whole time trying to start the car. The battery was covered in acid by the time I got to him and turning the key did nothing.) I tried to jump start the vehicle, but by then the car was doing nothing when the key was turned. We put a new battery in it, but still nothing when the key was turned. So I decided the starter was bad and purchased a new starter. We installed the new starter, however as soon as we touched the negative cable to the battery the starter would start spinning. We disconnected the starter and hooked the wires up again and this time nothing happened even when we turned the key. We removed the starter from the vehicle, checked the starter and it was working fine. We re-installed the starter on the vehicle and again as soon as we hooked the battery up the starter would start turning. I have checked every fuse and relay on the starter system and everything works. I checked continuity between the relay and the solenoid and I am getting continuity there. I am not sure what to try next. Any help would be appreciated.



PS I put a code reader on it and the only code was U0100 "Lost Communication with ECM/PCM A" I don't know if that has anything to do with it or is just a symptom of disconnecting and reconnecting the battery.


(This post was edited by Fishbum656 on Sep 8, 2018, 2:09 PM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 8, 2018, 2:16 PM

Post #2 of 4 (191 views)
Re: Starter turns when I hook the battery backup on 07 Pontiac G5 Sign In

My guess is there is an installation problem. When you attached the battery cable to the starter pole, sometimes it will rotate and make contact with another connection or it may even be wired incorrectly.

He also could have fried the starter relay with all the extended cranking.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Sep 8, 2018, 2:17 PM)


Fishbum656
New User

Sep 16, 2018, 3:31 PM

Post #3 of 4 (111 views)
Re: Starter turns when I hook the battery backup on 07 Pontiac G5 Sign In

Thank you for your assistance and I'm sorry it took so long to respond, I have been rained out for the past week.

Update, I checked the relays and they were all working. You are correct it was an installation problem. When my son tightened on the nuts on the starter, the battery wire turned with the nut until it was touching the S post. Thus causing the starter to turn when the battery was connected.

However, after correcting that problem, the engine still will not start. When you turn the key it does nothing. We pulled the alternator and had it tested and it was bad, so we installed a new alternator. It still does nothing when the key is turned.

Do you have any other ideas?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 16, 2018, 3:44 PM

Post #4 of 4 (107 views)
Re: Starter turns when I hook the battery backup on 07 Pontiac G5 Sign In

That is going to require some testing by someone that has some electrical knowledge that can follow a wiring diagram.

I can supply the wiring diagram and maybe answer questions about it but that's about all the help I can supply.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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