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Engine & Transmission - P0123 Code - Working on my mothers 97 Blazer 4.3 , used a code reader and pulled a P0123 TPS high voltage. OBD-II code P0123 means that there is a high input in the Throttle/Pedal Position Sensor/Switch 'A' Circuit. This sensor provides input from ... The ODBII code P0123 indicates that the Throttle Position Sensor (TPS) is sending a high voltage signal to the engine control module (ECM), ... DTC P0123: APP SENSOR SIGNAL VOLTAGE TOO HIGH Monitor & Set Conditions Accelerator Pedal Position Sensor (APPS) voltage is monitored when ... CEL P0123 Throttle Position Sensor/Switch A Circuit High Input help Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) The code is TPS related so a new throttle body should fix the issue since it is built in to the throttle body itself. I got the code P0123 so I figured I'd check the Tps sensor voltage and it was reading fine (has power, signal, ground) also checked it with throttle open and ... Within five seconds of turning off your vehicle's ignition switch, press down on both brake pedals firmly for at least 5 seconds and release ... P0123 Code - Throttle Position Sensor/Switch A Circuit High Input - MAP Cooling. MAP cooling can be fix with replacing thermostat. The common causes of TPS errors (apart from aftermarket throttle bodies and aftermarket TPS sensors): - TPS sensors go bad, especially in ...