P2120 2001 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'D' Circuit
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
- P2120 2001 Toyota Highlander indicates Throttle Pedal Position Sensor/Switch 'D' Circuit.
- 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 P2120 2001 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 P2120 2001 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 P2120 2001 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 P2120 2001 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 P2120 2001 Toyota Highlander Code
1. What does the OBDII code P2120 mean for a 2001 Toyota Highlander?
P2120 indicates an issue with the Throttle Pedal Position Sensor/Switch "D" Circuit, which monitors the position of the accelerator pedal.
2. What are the common symptoms of a P2120 code in a 2001 Toyota Highlander?
Symptoms may include reduced engine performance, the vehicle going into limp mode, unresponsive acceleration, and the check engine light turning on.
3. What causes the P2120 code to appear in my 2001 Toyota Highlander?
Common causes include a faulty throttle pedal position sensor, damaged wiring or connectors, a malfunctioning engine control module (ECM), or corrosion in the electrical circuit.
4. Can I drive my 2001 Toyota Highlander with a P2120 code?
While the vehicle may still drive, it could enter limp mode with reduced power. Driving in this condition is not recommended as it may lead to further damage or unsafe driving conditions.
5. How do I diagnose a P2120 code on my 2001 Toyota Highlander?
Diagnosing involves checking the throttle pedal position sensor, inspecting wiring and connectors for damage, and using a multimeter to test the circuit. An OBDII scanner can also help confirm the issue.
6. How do I fix the P2120 code in my 2001 Toyota Highlander?
Repairs may include replacing the throttle pedal position sensor, repairing damaged wiring, cleaning corroded connections, or, in rare cases, replacing the ECM.
7. How much does it cost to fix a P2120 code on a 2001 Toyota Highlander?
Repair costs vary but generally range from $100 to $300 for parts and labor, depending on whether the issue is with the sensor, wiring, or other components.
8. What tools do I need to fix a P2120 code on my 2001 Toyota Highlander?
You'll need an OBDII scanner, a multimeter for testing wiring and sensor output, and basic hand tools to remove and replace the sensor if necessary.
9. Can a dirty throttle body cause a P2120 code in a 2001 Toyota Highlander?
No, a dirty throttle body is unlikely to cause a P2120 code. This code specifically relates to the throttle pedal position sensor circuit, not the throttle body itself.
10. Will clearing the P2120 code turn off the check engine light permanently?
Clearing the code might turn off the light temporarily, but if the underlying issue isn’t fixed, the code will return after the vehicle completes a drive cycle.
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