On the 2005 Saturn Vue, the P2138 is pointing to a problem with the Accelerator Pedal Position Sensors. The code states there is a correlation error between the two sensors. These sensors are built into and part of the accelerator pedal assembly. Carefully inspect the electrical connector and wire harness for any loose, broken or damaged wires. Inspect for any signs of water intrusion. If the inspection checks ok, and there are no other codes set, it sounds like the Accelerator Pedal Position Sensors will need to be replaced.
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