2003 Cadillac CTS

2003 CADILLAC CTS
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MRJOSHUA200204
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  • 2 POSTS
Electrical problem
2003 Cadillac CTS 6 cyl Two Wheel Drive Manual
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sometimes doesn't start. says theft needs service.
Sep 6, 2008 at 11:32 PM
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BWNUNNALLY
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For your Cadillac's theft deterrent system, when you insert the key into the ignition coils around the ignition energize a transponder in the key. Do you have the same behavior with both of your keys?

Security Indicator Stays Illuminated and Engine Starts

Theft system could not measure transponder value or the ECM lost communication with the system while the engine was last running.

Security Indicator Illuminates when Engine is Running

Same while currently running.

Security Indicator Illuminated and Engine Does Not Start

System unable to read the transponder, or problem with the system or system is in learn mode.

Security Indicator Flashes and Engine Does Not Start

Incorrect value measured for transponder, or the calculation to the challenge is incorrect, or the ECM lost communication. This is considered a tamper condition.
Dec 16, 2018 at 9:42 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.