OBD-II Code P2123 is defined as a Throttle/Pedal Position Sensor/Switch “D” Circuit High. This trouble code indicates that there is a problem with the Accelerator Pedal Position (APP) Sensor, which is a critical component of the electronic throttle control system (ETCS). The APP sensor communicates the driver’s acceleration requests to the engine’s control module (PCM), which then controls the throttle valve accordingly.
What Does the P2123 Code Mean?
The P2123 code means that the PCM has detected a high voltage signal from the Throttle/Pedal Position Sensor/Switch “D” circuit. This can prevent the engine from receiving the proper input regarding how much power the driver is requesting, potentially affecting engine performance.
What Causes the P2123 Code?
Several factors can lead to the P2123 code being triggered, including:
- Accelerator Pedal Position (APP) assembly failure
- Powertrain Control Module (PCM) failure
- Throttle control motor failure
- Wiring issues, such as short circuits or damaged connectors
What Are the Symptoms of the P2123 Code?
Drivers may notice several symptoms when the P2123 code is present, including:
- Decreased engine performance
- Engine may enter limp home mode, reducing available power
How Serious Is the P2123 Code?
The P2123 code is categorized as urgent, meaning immediate action is necessary. Failure to address this issue can lead to severe damage to the engine or create unsafe driving conditions for the driver and passengers.
How to Diagnose the P2123 Code
To diagnose the P2123 code, a mechanic should perform the following steps:
- Use an OBD-II scanner to confirm the P2123 code and check for additional codes.
- Inspect the wiring and connectors associated with the APP sensor for damage or corrosion.
- Test the APP sensor’s resistance and voltage output to ensure it operates within specifications.
- Check the PCM and throttle control motor for faults.
Common Repairs for the P2123 Code
Common repairs to resolve the P2123 code may include:
- Replacing the Accelerator Pedal Position (APP) assembly
- Repairing or replacing damaged wiring and connectors
- Replacing the throttle control motor
- Reprogramming or replacing the Powertrain Control Module (PCM)
How Much Does It Cost to Fix the P2123 Code?
The cost to fix the P2123 code can vary significantly based on the specific repair needed. On average, repairs can range from $100 to $1,000, depending on whether it involves replacing an APP sensor, repairing wiring, or replacing the PCM.
Can I Fix the P2123 Code Myself?
While some DIY enthusiasts may be able to address minor wiring issues, most repairs related to the P2123 code, such as replacing the APP sensor or PCM, require specialized knowledge and tools. If you are not experienced in automotive repairs, it is advisable to seek professional assistance to ensure the issue is resolved correctly.
