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P2123 is a diagnostic trouble code (DTC) for "Throttle/Pedal Position Sensor/Switch D Circuit High Input". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $79.99. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Throttle/Pedal Position Sensor/Switch D Circuit High Input
The P2123 trouble code indicates that the Engine Control Module (ECM), which is in charge of receiving a signal from the throttle position sensor, has detected a malfunction within one of the circuits of the throttle position sensor.
This code is usually only found on vehicles that have an electronic throttle body. With that taken into consideration, some of the possible causes of the P2123 trouble code may include:
A mechanic may begin diagnosing the P2123 trouble code by popping the hood and locating the throttle body.
Once the throttle body has been located, the mechanic would then check the wiring and connectors to the throttle body motor and throttle position sensor.
If the wiring and connectors seem to be in good condition, the mechanic would then test the throttle position sensor and throttle body motor for proper function using the manufacturer’s recommended procedure.
In the unlikely event that the problem is not found at this point, the mechanic would then test the Engine Control Module to ensure that it is operating properly.
Whichever parts are found to be faulty would be replaced at the customer’s request.
A common mistake that could be made when diagnosing the P2123 trouble code would be to replace the throttle position sensor due to the fact that this part is mentioned in the trouble code definition. This is in fact the most common mistake when diagnosing any trouble code that mentions a part.
The P2123 trouble code should be considered very serious as it could cause drivability issues, such as preventing the vehicle from accelerating or even starting up. Even worse, this code can cause the vehicle to stall and leave the driver stranded. It is important to have the issue diagnosed and repaired as soon as possible in order to prevent being stranded on the side of the road.
Oftentimes, mice and other small animals can get up under the hood of a vehicle from the underside and nest or sleep in small areas of the engine bay. These animals like to sleep in the engine bay because it is warm. While these animals are in the engine bay, they like to chew on wires they find. If this is the case, the driver may be able to easily locate the issue by looking around under the hood.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.