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My 99 Deville with 135,000 would not start this morning. No symptoms or problems til this morning. Got the message"THEFT SYSTEM PROBLEM CAR MAY NOT START". Codes are: B0533, B2471, B2750, C1276, U1016, U1255.

Looks like the passkey is messed up. Any ideas or suggestions? I tried both of my keys too.

Happy New Year,


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Try spraying the key and lock with WD40 and work it in and out to distribute it. Someone posted a method (I think Kevin) to bypass this issue, but I can't remember what year it was for..

DTC B0533 Fuel Sensor Feedback Shorted High

B2471 - Interior Lamp Fault

>>B2750 - PASSKey Data Communication Failure<<

DTC C1276 Delivered Torque Signal Circuit Malfunction

DTC U1016 Loss of Communications with PCM

DTC U1255 Class 2 Initialization Error

I would clean your battery cables real good also, maybe you are getting an intermittant on one of your positive cables.

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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Probably wires inside the lock cylinder failed. You can replace the lock cylinder or fool the system installing a resistor equal to one in your key into the circuit. A few months ago there was a post with similar condition. The model year does not matter.

The saddest thing in life is wasted talent

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