Q: If I have a bad throttle position sensor will my car hesitate to start

asked by on February 18, 2017

My truck hesitates to start and know my gas pedal is not working

My car has 19700 miles.
My car has an automatic transmission.

Hello There, I believe you are correct in that you may have a faulty throttle position sensor. There are trouble codes that are typically associated with the TPS. One code will set if the TPS voltage is too high when the computer expects to see it lower. Another code will set if the TPS voltage is lower than the computer expects to see. The TPS code for low voltage is the most common and will usually set if the TPS is out of adjustment or the sensor has failed. The first thing you should do when you get a TPS code is to check adjustment and signal output of the TP sensor before replacing it. Be sure to wiggle all connections while watching scan data/voltage readout to make sure the problem is not a loose or bad connection. One of the most common symptoms of a failing TPS would be a tip-in hesitation or stumble when you apply throttle to take off from a stop. This can be caused by a dead spot in the TP sensor’s internal circuitry, which usually causes the output voltage signal to not change (or it drops out) when the throttle opens. I would recommend having an expert from YourMechanic come to your location to diagnose and inspect your vehicle.

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