If the key fobs for your Cadillac XTS are working for all functions except starting the engine, there could be a few possible reasons for this issue. Here are some steps you can take to diagnose and potentially resolve the problem:
Reprogramming the Key Fobs:
Sometimes, key fobs can lose synchronization with the car's security system. Try reprogramming the key fobs using the vehicle's manual or contacting a dealership for guidance.
Faulty Ignition Switch / Push Start button:
The issue could be with the ignition switch itself. A faulty ignition switch might prevent the engine from starting even if the key fob is functioning properly.
Security System / immobilizer issues:
Modern vehicles often have complex security systems that can sometimes cause issues with starting the engine. If the security system is not recognizing the key fob properly, it may prevent the engine from starting.
Dead Key Fob Batteries:
Even if the other functions of the key fob are working, a weak battery could still cause problems with starting the engine. Make sure the new batteries you've installed are of good quality and fully charged.
Key Fob Signal Interference:
Sometimes, electronic interference can disrupt the communication between the key fob and the car's security system. Make sure there are no strong electromagnetic sources or other potential sources of interference nearby.
Faulty Key Fobs:
Key fobs can experience internal failures that affect specific functions. If the key fobs are not communicating the start signal properly, they might need to be replaced.
