P2123 2003 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
Quick Answer
The Accelerator Pedal Position (APP) sensor is mounted on the accelerator pedal to detect the angle of the accelerator pedal. Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Accelerator Pedal Position (APP) Sensor harness is open or shorted, Accelerator Pedal Position (APP) Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P2123 2003 Toyota Highlander indicates Throttle Pedal Position Sensor/Switch 'D' Circuit Input High.
- Common causes
- Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Accelerator Pedal Position (APP) Sensor harness is open or shorted, Accelerator Pedal Position (APP) Sensor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P2123 2003 Toyota Highlander Description
In the accelerator pedal position sensor, the voltage applied to terminals VPA and VPA2 of the Engine Control Module (ECM) changes between 0 V and 5 V in proportion to the angle of the accelerator pedal. The VPA is a signal to indicate the actual accelerator pedal angle and is used for the engine control. VPA2 is used to detect malfunctions of the sensor itself.
The ECM monitors the accelerator pedal angle from VPA and VPA2 signal outputs, and controls the throttle motor based on these signals.
What are the Possible Causes of the DTC P2123 2003 Toyota Highlander?
- Faulty Accelerator Pedal Position (APP) Sensor
- Accelerator Pedal Position (APP) Sensor harness is open or shorted
- Accelerator Pedal Position (APP) Sensor circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P2123 2003 Toyota Highlander?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P2123 2003 Toyota Highlander code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P2123 2003 Toyota Highlander Code
1. What are the common symptoms of OBDII code P2123 in a 2003 Toyota Highlander?
The common symptoms of OBDII code P2123 include reduced engine power, hesitation or stalling when accelerating, and the vehicle going into limp mode.
2. What does the OBDII code P2123 in a 2003 Toyota Highlander indicate?
OBDII code P2123 indicates an issue with the Throttle Pedal Position Sensor/Switch 'D' Circuit Input being too high, signaling a problem with the throttle position sensor.
3. What are the possible causes of OBDII code P2123 in a 2003 Toyota Highlander?
Possible causes of OBDII code P2123 include a faulty throttle position sensor, damaged wiring or connectors in the throttle pedal position sensor circuit, or a problem with the engine control module (ECM).
4. How can I diagnose the OBDII code P2123 in my 2003 Toyota Highlander?
Diagnosing OBDII code P2123 involves using a scan tool to read the code, checking the throttle position sensor's wiring and connectors for damage, and testing the sensor's voltage output.
5. Can I still drive my 2003 Toyota Highlander with OBDII code P2123?
It is not recommended to drive your 2003 Toyota Highlander with OBDII code P2123, as it can lead to potential safety hazards due to reduced engine power or stalling.
6. How can I repair OBDII code P2123 in my 2003 Toyota Highlander?
Repairing OBDII code P2123 involves replacing the faulty throttle position sensor, repairing any damaged wiring or connectors, and clearing the code with a scan tool.
7. Will disconnecting the battery reset OBDII code P2123 in my 2003 Toyota Highlander?
Disconnecting the battery may temporarily clear the code, but it is important to diagnose and repair the underlying issue causing OBDII code P2123 to prevent it from reoccurring.
8. Can a dirty throttle body cause OBDII code P2123 in a 2003 Toyota Highlander?
While a dirty throttle body can cause performance issues, OBDII code P2123 specifically relates to the throttle position sensor, so cleaning the throttle body may not resolve this particular code.
9. How much does it cost to fix OBDII code P2123 in a 2003 Toyota Highlander?
The cost to fix OBDII code P2123 can vary depending on the extent of the issue. Replacing a throttle position sensor can range from $100 to $300, with additional costs for labor if done by a mechanic.
10. Can I prevent OBDII code P2123 from occurring in my 2003 Toyota Highlander?
Regular maintenance, such as checking and cleaning throttle sensors, inspecting wiring for damage, and using quality fuel, can help prevent OBDII code P2123 in a 2003 Toyota Highlander.
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