Having problems with your 2005 Saturn ION ?
What does an error code u2100 mean - 2005 Saturn ION
Well a U code like U2100 is a communication error,meaning there is a bad computer in the car or a wires issue,one of the other computer in the car can not talk to the other so its send a loss of communication code as you got,,,,i would highly rec you go to the dealer for this concern
Repair Help & Product Troubleshooting for 2005 Saturn ION
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