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P1121 Pedal Position Sensor A Circuit Range/Performance

 P1121 Pedal Position Sensor A Circuit Range/Performance


If you have a P1121 code on your vehicle, it means that the powertrain control module (PCM) has detected a problem with the pedal position sensor A circuit. The pedal position sensor is a device that measures the angle of the accelerator pedal and sends a signal to the PCM to adjust the fuel and air mixture, the ignition timing, and the transmission shift points. The pedal position sensor A circuit is the one that provides the primary signal to the PCM.


The P1121 code indicates that the PCM has detected a range or performance issue with the pedal position sensor A circuit. This could mean that the sensor signal is too high, too low, or erratic. The PCM will set the code and illuminate the check engine light when it determines that the sensor signal is out of the expected range or does not match the throttle position sensor signal.


There are several possible causes for a P1121 code, such as:


- A faulty pedal position sensor

- A damaged or corroded wiring harness or connector

- A short or open circuit in the sensor wiring

- A faulty PCM


To diagnose and fix a P1121 code, you will need to perform some tests and inspections, such as:


- Checking the pedal position sensor for proper operation and resistance using a multimeter

- Inspecting the wiring harness and connector for any signs of damage, corrosion, or loose connections

- Testing the continuity and voltage of the sensor circuit using a multimeter and a wiring diagram

- Replacing the pedal position sensor if it is defective or out of specification

- Clearing the code and test driving the vehicle to see if it returns

- Replacing the PCM if it is determined to be faulty


A P1121 code can affect the performance and drivability of your vehicle, as well as increase your fuel consumption and emissions. Therefore, it is important to address this issue as soon as possible and prevent further damage to your engine and transmission. If you need professional help with diagnosing and repairing a P1121 code, you can contact a certified mechanic or visit your local auto repair shop.

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Location: New York, NY, USA

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