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mikera
New User
Jan 17, 2014, 5:52 PM
Post #1 of 7
(2631 views)
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2005 cadillac sts
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got a 2005 sts with northstar engine I drove it home from work everything worked fine next morning went to start it hit the brakes pushed the button all the dashboard lights turned off everything then 15 seconds later it came back on when I tried to scan it for codes there is no communication with the pcm but my scanner can communicate with the tcm and all the other moduals starter is not bad I jumped it from the relay box and it cranks the engine but still no start any one else have this kind of problem
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Discretesignals
Ultimate Carjunky
/ Moderator
Jan 17, 2014, 6:11 PM
Post #2 of 7
(2618 views)
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Re: 2005 cadillac sts
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Does the check engine light bulb check when you turn the ignition on? Do you have a volt meter and know how to do voltage drop testing?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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mikera
New User
Jan 18, 2014, 9:37 AM
Post #3 of 7
(2594 views)
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Re: 2005 cadillac sts
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yes the check engine light comes on and all the other lights on the dash but when u wait a second they turn back off and yes I got volt meter and I know how to use it I replaced the battery brand new from dealer but still the same problem when I hit the start button everything turns off inside the car everything then about 10-15 seconds later everything comes back on when I scan the tcm for codes I get U0100
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 18, 2014, 9:38 AM
Post #4 of 7
(2590 views)
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Re: 2005 cadillac sts
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Sounds like you have a connection problem in the cables somewhere.
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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.
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Discretesignals
Ultimate Carjunky
/ Moderator
Jan 18, 2014, 10:03 AM
Post #5 of 7
(2586 views)
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Re: 2005 cadillac sts
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If the TCM pushed out that code that means it can't communicate with the ECM. You have two possible scenarios: (1) A communication issue with the data bus (2) A faulty or inactive ECM. This might be above your pay grade and would require an experienced drive-ability tech to check it out.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jan 18, 2014, 10:35 AM
Post #6 of 7
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Re: 2005 cadillac sts
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Intuition: New battery dealer or not the connections right there as it was touched at all for any reason can be a pest and mess up any other testing. Lights go out you said and can come back. To me the suggest those connections.
See, battery side post female threads are lead and bolts are steel. They no like being overtightened, corroded, or all hell if one ever cross threaded. Doesn't much matter if a Cadillac or Cavalier they have to be right, snug, clean, good and not stripped,
T
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mikera
New User
Jan 18, 2014, 2:03 PM
Post #7 of 7
(2572 views)
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Re: 2005 cadillac sts
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took it to the dealer they said its a bad PCM $800 to fix thanks for you're help
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