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What is the meaning of OBD-II code P0122, and what are the possible causes and solutions for this code to be generated?

The P0122 code, which is a standard diagnostic code used by OBD-II systems, shows that the Engine Control Module (ECM) has detected a voltage drop below the normal range in the TPS sensor circuit A. There are various reasons that might trigger the P0122 code, one of which is the TPS sensor circuit A output to the ECM falling below the designated voltage level, reaching a low of .2 volts or less. To diagnose the problem, a mechanic will typically scan codes and view freeze frame data, clear fault codes and retest the vehicle, visually check TPS connections and wiring, compare TPS circuit data, and replace TPS if necessary, with road testing afterward. The resolution for the P0122 code depends on the cause but may involve fixing the TPS connector, repairing damaged wiring, or replacing the TPS sensor. The P0122 code is often accompanied by other TPS codes and may require the manufacturer's pinpoint tests to fix. Most failures are caused by a defective TPS sensor or loose connector and will result in the ECM going into failure mode with similar driving symptoms.

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