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Engine not start


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Hi i have a STS from -99. Me and family vhere out and driving and then abs and tc lamp start lighting, i stop after a few kilometer and al people go out from the car. Door windov and trunck was open for abut 1/2 hour. Then drive away again after 500 meter motor stop and service stab and theft system come in the display. I take off + pol from battery 1 hour but the car will not start.

Now i have a lot of curent cod:ABS C1276,U1255. RSS C1783,1784. DDM,DIM,IPC,IPM,IRC,RFA,RIM,SDM al U1255.MSM U1000. And VTD U1255 history.

I understand thath this is a "class 2 communication malfunction serial dataline malfunction."

What can i do so i find what are wrong in the car? Can a Tech 2 instrument find out whats wrong?

Have the theftsystem stopped computer?

Thank you Anders

Edited by Anders Kronlund
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Hello

I would have the battery load tested, when the battery is bad or there is a bad connection LOTS of codes can be set due to low or intermittan power

Clean the battery connections, especially the red or positive (+) cable. That positive cable is two wires sandwidged with a lead (Pb) lug between them. That joint gets corroded and prevents the engine from drawing power to start.

Let us know how this turns out, Mike

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Thank you Mike, i allredy clean the connections and alot of fuses. The starter is working.

Anders

Oh, so the starter turns it won't start. Sorry

With all of those codes, I still think battery. Can you have the battery load tested?, to eliminate that possibility

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Charging the battery is the first step, the second step is to test it. It is possible for the battery to read 'charged' and put out 12 volts but to die/bog down when a load is placed on it, with the available voltage dropping to 8 or 9 volts...

Have it load tested or use a KNOWN GOOD battery

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Hi again, i just talk to a man who had repared my car before and he said that it has been WATER in it. Now i had to check connections on the floor perhaps something wrong with them. Anders

check for rust or corrosion BEHIND the fuse panels. Also pull out several fuses, and spray wd-40 in there before you reseat the fuses. Water can do lots of damage to an already delicate electrical system.

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  • 2 weeks later...

Did you put a new battery in it? - how are your volts? is your alternator functioning properly? - please let us know the results. Again, your symptoms are similar to a starved electrical system.

hmmm. are you saying it was a flood car. in other words it was submerged underwater, and then repaired? - if that is the case, it could be a bad PZM,PCM or similiar componant.

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  • 2 months later...

Hallo, i want to give feedback about the problem with my car. I took it to a garage and in the tech2 instrument they can see it was ground problem. After working 15 hour they find a cable under the gearbox which have a bad connection. Now everything ok with the car no current codes only a lot of history codes. :yupi3ti: Anders

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Thanks for following up. So it sounds like it is an engine ground -I guess the water affected the ground connection underneath the car?

This is not a flod car but the first time problem start was when it raining a lot and ABS stop working and then come more and more problems so your guess is correct. If you have problem with abs rss etc. check batery and ground connections because the computers are not so often brake down. Anders

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