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97 Cadillac Deville Concours
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8 Posts
Discussion Starter #1
Hi...car is in great shape with 120k. After driving down a N. Michigan snowy/slushy road, the ABS/Stability control dash lights came on. I stopped shortly after that at the store, when I came back out and started the car, they did not come back on. Then over the next two weeks, once in a while upon starting, they would come on, but if the car was restarted, they wouldn't. For the last 3 days, every single time the car is started and I drive it, these lights are on. Each time from start till now, the scrolling digital readout did show reduced stability control.
Any ideas on where I should start to check this out, or what could be the problem?
Thank you so much in advance
 

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Super Moderator
2010 DTS
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87,430 Posts
Start by pulling the DTC's. Post the codes and definitions. See the sticky at the top of the forum if you don't know how to pull them.
 

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Registered
97 Cadillac Deville Concours
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8 Posts
Discussion Starter #3
Thank you for the info...I hope I did it correctly but here is what it showed when I followed the directions as stated.
PCM 0603
PCM 1520
NO IPC
NO ACM
NO SDM
NO RSS
NOPZM
NO IRC
NO RFA
NO CCP
NO MSM
NO MMM
Does that help in determining the problem? Trying to look up the P codes it said
P0603 - Control Module Long Term Memory Reset and

P1520 - Transmission Range Switch Circuit

Are these major repairs or a simple replacement???
Thank you again, any help would be appreciated.
don
 

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Super Moderator
2010 DTS
Joined
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87,430 Posts
I'm guessing the Transmission Range Switch is the PRNDL switch, but not positive. The shift cable should lead you to it, but I'm not sure if replacing that would solve the problem or not. Might try cleaning the connections first.
 
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