Cadillac STS 2008 V6 3.6, showing 'service theft system' warning but running ok.Then suddenly engine. not cranking . Cranking once in a 100 attempts but showing 'reduced engine power
Analysed on MDI COMPUTER , showing fault codes : U0100 , U2105 , U2106, U2120. Strange , because is virtually a brand new car , done 2,000 km only. It's a RHD CAR , bought from UK , AT ZERO KM IN 2010 .
Check your Battery and ground first tighten all connections
Check the hood latch then all battery connections and ground, those problems are electrical in nature.
Today the engine did crank but was facing the following problems.
1). Engine Check Light ( Engine Symbol ) steadily On .
2). Displays : Engine Power Reduced .
3). Displays : Service Theft System .
4). TC Light On.
5). RPM Not Going Beyond 1,500.
6). Burning Smell started within 3 to 4 mins , and
7). Battery Positive Cable became quite Hot.
Switched the engine off .
The car starts once in a few days like this .
Then car does not start again
A)Vehicle accident and grnds not reattached well.
B)Rodent ate through grnds.
Whatever it is fixit fast if not modules may go down as well.
I do remember some threads linking odd security system warnings to the hood-latch-sensor. Without a dealer, you've got a challenge.
Have you tried calling the International Cadillac number and explaining your problem of no qualified shop? They may have a relationship with a shop in a nearby city. You need someone with a TechII and a connection to GM's service network.
Thanks for your input.
I was also thinking along the rodent angle, because nothing can / should go wrong overnight , in a unused car like this .
Since it seems that the modules are not able to communicate with each other, some wires have been messed up .
Will get it checked by a mechanic , and revert to you .
Things can go wrong with a car that just sits. Driving a car regularly keeps the battery charged, the oil water-free and all flexible parts pliable.