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The only code it gives me is p0123. Does anybody know if the throttle position sensor is reading too high would that cause the PCM not to let the car start? The common causes of TPS errors (apart from aftermarket throttle bodies and aftermarket TPS sensors): - TPS sensors go bad, especially in ... ... P0123 Code: Dirty Throttle Body Bad Throttle Position (TP) Sensor Bad Accelerator Pedal Position (APP) Sensors Wiring Open or Short By using ... It doesn't respond to inputs at the gas pedal like it should. It has a VERY slow response, making the car extremely sluggish and dangerous to drive. Your TPS itself is bad or the wiring and connection are bad. If you are going to replace the TPS, check the wiring and connector to the current one first. It sounds like the TPS sensor is bad. Here are instructions on how to change the sensor out in the diagrams below. It looks like it self- ... The P0123 CEL description TPS/APP Circuit High and Throttle Position Sensor 1 Circuit High; which I read as meaning the same thing... I would ... How to quickly test and replace the throttle position sensor for your car or truck. Typical symptoms of a bad or failing TPS include: poor ... It sounds like the spot check is OK, Try wiggling and moving the wires. The computer only has to see the high voltage for .5 seconds to set the code. Code reads 0123 - Throttle/Pedal Position Sensor/Switch A Circuit High Input. Along with this code I have some downstream sensor circuit codes.