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does your unlock button work in car? If it does, do you have another keyless entry key fob? If so does it work? If you just replaced the battery you can try removing battery and cleaning contacts within remote. I know some of the nissan altimas had the same issue and the only solution was a new key fob. Good Luck
probably sensor for keyless entry,but would not advise u too get this from a junk yard as the sensors are vin specific,will put ur car into anti-theft mode then u will have to replace the body control computer,have a dealer order u a keyless entry sensor vin specific for ur car,these are usually under dash up top middle area its a little black box,will have to remove dash pad or dash to replace.
Replace the battery in the keyless entry. Pry the plastic apart and look at the battery...should look like a watch battery or simply take it to a dealer and they should replace for the cost of the battery.
If this doesn't work it will need to be reprogrammed. You manual should tell you how.
I have a 2006 Chevy Uplander and I also drive a 2008 Chevy HHR for my company vehicle. this may not be your problem but in my personal vehicle and also our company fleet vehicles i have experiened Key fob failures. the first symptom was that the fob would stop working intermittently, then stop working all together. if you open it you may see that the clip that holds the battery and makes the circuit connection has come un-soldered from the board. if you are careful you can re-solder this and you are back in business. be careful not to damage the case. if it shows signs of opening, the dealer will not troubleshoot your problem and they will make you purchase a new fob.
Lock your car with the keyless entry.Push it twice.Then walk over to passenger side and un lock with key.Then put key in ignition and start the car..If that dont work lock the doors again with the keyless entry.Push lock twice and then push the unlock twice..that should start your car,Repost if you have no luck to consider different stratigies.