On the 2012 Chevy Traverse, the P2122 and P2138 codes are directly related and are pointing to a problem with the Accelerator Pedal Position Sensor. This sensor is built into and part of the accelerator pedal assembly. Inspect the electrical connector and wire harness for any loose, broken or damaged wires. Inspect the electrical connector for any signs of water intrusion. If no problems are found, replacing the Accelerator Pedal Position Sensor should solve the problem.
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