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Need help with U1040, P1571 and P1644

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Hello guys,

I'm having trouble with these 3 codes


U1040 Loss of Class 2 Communications with ABS

P1571 - Traction Control Torque Request Circuit

Usually every time i would turn on the car and put it on reverse or drive the Brake will disingage automatically, now i have to do it manually.

I just noticed yesturday that when i turn on the AC it only blows air to the floor, and it doesnt blow air to the front vents.

My traction control light is on and at times it gives me the brake and ABS light.

I've also noticed that sometimes when i turn on my car it feels like if i have a low battery, or if i turn or if i leave my stereo on for like 5 minutes and gives me the low battery warning it wouldnt do that before. Can someone help me out thanks...

by the way i replaced the rotors and brakes 2 weeks ago.

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These cars require a strong battery delivering steady power with sufficient load capacity

The first thing I would do is have my battery load tested at sears, to test for a dead or weak cell

When i reinstalled it, I would clean the connections really good, especially the positive cable, it is two wires sandwidged between a lead (Pb) lug

Then check the codes again, a weak battery can throw codes

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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