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Disconnect both battery cables (positive and negative) and clamp or use a jumper wire to hold them together, turn key to on position and let it sit for 10 minutes. Then turn ignition off and remove key, reconnect battery cables at a time, positive first then negative. This should reset the system.
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You need a scan tool that can access the immobilizer system and check for codes, this would be the next step.
Check all fuses if you are unable to connect with the scan tool.
A blown fuse can cause a no communication problem.
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