P0601 means your engine computer has an internal error; P0606 means that the engine computer has stored in memory exactly the running condition( much like a "black box") that the vehicle was in when the P0606 was triggered. P1518 also relates to the PCM in the matter of low voltage.
Try testing the battery as improper voltage can cause all of these codes. Otherwise it means that your PCM has failed and either needs to be reprogrammed or replaced.
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