Hyundai Repair Questions? Ask a Mechanic for Answers ASAP
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If the work has not been checked over for anything electrical that may have been bumped loose at all this should be done.I have seen issues with loose wiring or connections when the plugs and wires are replaced that can cause this issue here.
If this is o.k. and the shop actually crossed two electrical plug ins plugging them in incorrectly this can cause damage to the engine/transmission ecu causing this fault here.I have seen this occur as well in the past before.
If you have not had the fault codes checked/read out using a fully compatible scan tool plugged into your model to see what codes are set this should be done.If any codes are set in any of the computers the codes will need diagnosed to help in locating and repairing this issue here.If the crossed connections did cause damage to the ecu (which I suspect it may have) then the shop that did the repair should cover the costs for repair to resolve this here.
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