What is OBD-II Code P2622 – Throttle Position Output Circuit High

Throttle Position Output Circuit High: OBD-II Code P2622

As an experienced mechanic, I understand how frustrating it can be for car owners to see a notification pop up on their dashboard indicating a problem with their vehicle. However, the beauty of modern technology has made it possible for such problems to be detected and diagnosed using the On-Board Diagnostic (OBD) system.

One of the codes that drivers might see is OBD-II Code P2622 – Throttle Position Output Circuit High. In this article, I will explain what this code means, the possible causes, and the best way to go about fixing it.

Understanding OBD-II Code P2622

Whenever your car’s computer system detects a problem, it generates a fault code, which in turn triggers your check engine light. OBD-II Code P2622 specifically refers to a problem with the Throttle Position (TP) sensor and its output circuit. The TP sensor, also known as the accelerator position sensor, is responsible for communicating the position of the throttle to the engine control module (ECM) so that it knows how much fuel and air to mix for combustion.

When the ECM detects that the TP sensor’s output is higher than expected, it triggers the P2622 code, indicating a problem with the TP sensor’s output circuit. The code is shown as “Circuit High.” In other words, the voltage reading is too high, indicating that something is wrong either with the sensor itself or the circuitry responsible for sending the signal to the ECM.

Possible Causes of P2622 Code

Finding the real cause of this code requires expertise in diagnosing engine problems. However, the following are some of the common causes of OBD-II Code P2622:

1. Faulty Throttle Position Sensor

TP sensor failure is often the primary cause of a high voltage output signal. Usually, the sensor becomes worn over time, making it difficult to read signals or produce the correct voltage. Additionally, it may become loose or damaged due to wear and tear, contamination, or improper adjustment, causing the signal to become intermittent.

2. Corroded or Damaged Wiring

Corroded or damaged wiring is another possible reason for the OBD-II Code P2622. Broken wires or corroded connections between the TP sensor and the ECM may cause the voltage to become unstable. The wiring could also be internally damaged or frayed, leading to short circuits between various components.

3. Damaged or Loose Connectors

Blown fuses or damaged connectors between the TP sensor and the ECM can also cause voltage problems. In such situations, the circuit may have no power, or the voltage signal produced may differ from the one expected by the ECM.

4. ECM Malfunction or Faulty Software

A malfunctioning ECM can also lead to the P2622 code. Although rare, a computer malfunction might cause the ECM to interpret the TP sensor output signal incorrectly. Alternatively, corrupted software may cause the ECM to malfunction or output incorrect codes.

5. Improper Adjustment of Throttle Position Sensor

An incorrectly adjusted TP sensor can also mislead the ECM into interpreting the throttle position as higher than it should be. Adjusting the sensor correctly might sometimes solve the problem.

Repairing the P2622 Code

Fixing the OBD-II Code P2622 depends on the exact issue that’s causing it. By using a code scanner, you can identify the root of the problem:

1. Inspect and Repair the TP Sensor

If the TP sensor is faulty, the best remedy is to replace it altogether. However, you can inspect the sensor’s wiring harness and connectors to ensure they are in good condition. Ensure all connections are tight and repair any wires that may be corroded or frayed.

2. Check and Repair the Wiring Harness

Check the wiring harness for breaks or fraying along its length. Repair them by cutting out the affected section and splicing in a new section.

3. Fix Damaged Connectors

Repair any corroded or damaged connectors, replace blown fuses, and make sure all connections are tight and secure.

4. Check the ECM, Replace if Necessary

Diagnosing an ECM problem or software issue might be harder. If nothing seems to fix the OBD-II code P2622, the possible culprit is the computer. In such a scenario, diagnose with the aid of specialized diagnostic tools and replace the ECM or upgrade its software.


1. Can I drive my vehicle with the P2622 code on?

Driving a car with the P2622 code on may cause further damage to the engine, potentially leading to costly repairs. It would be best to avoid driving the vehicle until you have it diagnosed and repaired.

2. How much does it cost to fix OBD-II Code P2622?

The cost of repairing P2622 varies depending on the severity and cause of the issue. You can avoid additional costs by diagnosing and fixing the issue promptly.

3. How long does it take to fix the P2622 code?

The time required to repair OBD-II Code P2622 also varies depending on the root cause of the issue. A typical repair time can range from one to five hours, depending on your mechanic.

4. Can I fix the P2622 code myself?

The P2622 code is best diagnosed by a professional mechanic who has the necessary diagnostic equipment. In a bid to avoid unintended damage, an untrained individual is discouraged from attempting the repair themselves.

5. What are the benefits of fixing the P2622 code?

Fixing the P2622 code will result in better engine performance, a return to improved fuel efficiency, an increase in the vehicle’s lifespan, and better driving experience.


OBD-II Code P2622 often indicates a problem with the Throttle Position Sensor output circuit, with several possible causes. Regular engine scanning helps detect issues before they turn into major problems, allowing for timely and inexpensive repairs. As a car owner, you should always ensure that your car is serviced on time and keep an eye on the dashboard for any trouble indications. With proper diagnosis and repairs, you will enhance your vehicle’s performance and extend its lifespan.

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