P0120 2007 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction
Quick Answer
The throttle position sensor (TPS) responds to the accelerator pedal movement. Common causes include Faulty Throttle Position Sensor, Throttle Position Sensor circuit is open or shorted, Throttle Position Sensor 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
- P0120 2007 Toyota Highlander indicates Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction.
- Common causes
- Common causes include Faulty Throttle Position Sensor, Throttle Position Sensor circuit is open or shorted, Throttle Position Sensor 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 P0120 2007 Toyota Highlander Description
Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sensor. This sensor controls engine operation such as fuel cut. On the other hand, the Wide open and closed throttle position switch, which is built into the throttle position sensor unit, is not used for engine control.
What are the Possible Causes of the DTC P0120 2007 Toyota Highlander?
- Faulty Throttle Position Sensor
- Throttle Position Sensor circuit is open or shorted
- Throttle Position Sensor poor electrical connection
How to Fix the DTC P0120 2007 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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0120 2007 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 P0120 2007 Toyota Highlander Code
1. What is OBDII code P0120 on a 2007 Toyota Highlander?
OBDII code P0120 indicates a malfunction in the Throttle Pedal Position Sensor/Switch 'A' Circuit. This sensor communicates the position of the throttle pedal to the engine control module (ECM) to adjust fuel injection and engine timing.
2. What are common symptoms of code P0120 in a 2007 Toyota Highlander?
Symptoms include erratic throttle response, engine stalling or hesitating, reduced fuel efficiency, and the engine light turning on. The vehicle may also enter a limp-home mode where engine power is reduced to prevent damage.
3. What causes a P0120 code to appear on a 2007 Toyota Highlander?
Common causes include faulty throttle position sensor, poor electrical connection at the throttle position sensor, or a damaged throttle body. Wiring issues or a malfunctioning ECM could also trigger this code.
4. How can I troubleshoot and fix code P0120 in my 2007 Toyota Highlander?
Start by checking the electrical connections and wiring to the throttle position sensor for damage or loose connections. If the connections are secure, test the throttle position sensor itself and replace it if it fails the test. Also, inspect the throttle body for any signs of damage or obstruction.
5. Is it safe to drive my 2007 Toyota Highlander with code P0120?
While you may be able to drive for a short distance, it’s not advisable to continue driving with this issue as it can lead to more serious problems like stalling or reduced vehicle control. It's best to address the problem promptly.
6. Can a faulty battery or alternator cause code P0120 in a 2007 Toyota Highlander?
While not the most common cause, electrical irregularities due to a faulty battery or failing alternator can sometimes lead to sensor malfunctions, including the throttle position sensor. It’s worth checking if other electrical issues are present.
7. How much does it typically cost to repair a P0120 issue in a 2007 Toyota Highlander?
The cost can vary significantly based on the root cause. If it's just a sensor replacement, it may cost between $150 to $300 including parts and labor. However, if the issue involves electrical repairs or ECM issues, the cost could be higher.
8. What tools are needed to diagnose the P0120 code on a 2007 Toyota Highlander?
You will need an OBDII scanner to read the code and monitor live data. Additionally, a multimeter can be useful for checking the sensor’s functionality and verifying the integrity of wires and connections.
9. Could code P0120 affect the transmission behavior of my 2007 Toyota Highlander?
Yes, since the throttle position sensor influences engine timing and fuel mixture, a malfunction can also impact transmission shift timing and smoothness, leading to rough or erratic gear shifts.
10. What should I check first if I get a P0120 code on my 2007 Toyota Highlander?
First, inspect the throttle pedal position sensor and its connections for any obvious signs of damage or disconnection. Ensure that the wiring harness is secure and that there are no broken or frayed wires.
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