Fix P2123: STEP-BY-STEP diagnostic GUIDE!

The P2123: Throttle/Pedal Position Sensor/Switch ‘D’ Circuit High refers to an issue where the throttle or pedal position sensor ‘D’ is receiving a higher-than-expected voltage or signal. This can be caused by a faulty sensor or wiring issues.

P2123 – Quick Overview

CodeInformation
MeaningP2123: Throttle/Pedal Position Sensor/Switch ‘D’ Circuit High
Is it serious?Yes, it can affect throttle response and lead to drivability issues.
Possible causes– High voltage or signal from throttle/pedal position sensor ‘D’
– Faulty sensor
– Wiring issues
How to diagnose?– Measure voltage or signal from the sensor
– Test the sensor for faults
– Inspect wiring and connections

P2123 Meaning

The P2123 code indicates that the throttle/pedal position sensor ‘D’ is experiencing a higher-than-normal voltage or signal input. This issue can prevent the throttle from responding correctly, leading to poor vehicle performance. It is often caused by a defective sensor, wiring problems, or electrical faults.

Step-by-step diagnostic guide

ActionDescriptionTools Needed
Check for Other CodesUse an OBD-II scanner to check for other related codes that could provide more insight into the issue.OBD-II Scanner
Inspect Throttle/Pedal Sensor WiringVisually inspect the wiring and connectors for the throttle/pedal position sensor ‘D’ for any signs of damage, loose connections, or corrosion.Flashlight, Multimeter
Measure Voltage or SignalUse a multimeter to measure the voltage or signal being sent by the throttle/pedal position sensor ‘D’. Compare the readings to manufacturer specifications.Multimeter
Test Sensor for FaultsUse a diagnostic tool to test the throttle/pedal position sensor ‘D’ for any internal faults or malfunctions.Diagnostic Tool
Inspect Wiring for ShortsCheck the wiring connected to the throttle/pedal position sensor ‘D’ for any shorts, open circuits, or other issues.Multimeter, Wiring Diagram
Clear the Code and Test DriveAfter repairs or adjustments, clear the code with an OBD-II scanner and take the vehicle for a test drive to confirm the issue is resolved.OBD-II Scanner
Recheck for CodesAfter the test drive, re-scan the vehicle to ensure the P2123 code has not returned.OBD-II Scanner
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