Troubleshooting P2122 Code in Hyundai Sonata: What to Do Next

AvatarByCarl Frisch

P2122 is an OBD-II diagnostic trouble code (DTC) that indicates a problem with the throttle/pedal position sensor/switch ‘A’ circuit low input. This code is common on Hyundai Sonata vehicles, which are equipped with a 2.4 liter engine. The throttle position sensor helps the vehicle’s computer control the amount of air and fuel entering the engine, and helps regulate engine performance. If this sensor fails, it may cause the engine to run rough, as well as cause poor fuel economy and reduced power output. To diagnose this code, a technician will need to visually inspect all wiring related to the throttle position sensor, as well as check for any stored codes or system malfunctions that may be related to this code. Once all wiring is confirmed to be good and all related codes have been addressed, then the technician can focus on testing the throttle position sensor itself. If all tests pass, then it is possible that a faulty throttle position sensor is at fault for this code being set.

Automobile

What is the Hyundai Sonata P2122 Code?

The Hyundai Sonata P2122 code is an error code that pertains to the vehicle’s electronic throttle control system. The code is triggered when an issue is detected in the throttle control system, such as a malfunctioning sensor or a faulty wiring harness. The code comes in two varieties: a soft code and a hard code. A soft code indicates that the problem is intermittent and can be resolved without further diagnosis; however, a hard code indicates that the problem needs to be addressed immediately.

Causes of the Hyundai Sonata P2122 Code

The most common cause of the Hyundai Sonata P2122 code is a faulty throttle position sensor (TPS). Other possible causes include a malfunctioning accelerator pedal position (APP) sensor, loose or corroded wiring connections, an open circuit in the wiring harness, or even an internal fault in the electronic throttle control module itself. In some cases, dirt buildup on the throttle body can also cause this code to appear.

Symptoms of the Hyundai Sonata P2122 Code

When this code appears, you may notice several symptoms, including:
• An illuminated check engine light
• Poor acceleration
• Hesitation when accelerating
• Reduced fuel efficiency
• Engine misfires
• Rough idle
• An engine that stalls when coming to a stop.

Diagnosing the Hyundai Sonata P2122 Code

Preparation for Diagnosis

Before starting any diagnosis for this particular error code, it’s important to make sure you have all of the necessary tools and supplies ready at hand. This includes: an OBD-II scanner; access to technical service bulletins; any wiring diagrams or repair manuals specific to your make and model; and any other specialty tools required for your specific vehicle. You should also make sure you have updated software installed on your scanner as well as any updates from your vehicle’s manufacturer if applicable.

Checking for Common Problems

Once all of your supplies are ready and your vehicle has been properly prepared for diagnosis, start by checking for any common causes of this particular error code using your OBD-II scanner. This includes checking for any loose or corroded connections in your vehicle’s wiring harness as well as checking all of your sensors for proper operation using their respective diagnostic functions on your scan tool. If any issues are found with these components then they will need to be repaired or replaced before continuing with further diagnosis.

Automobile: P2122 Code Hyundai Sonata

The P2122 trouble code indicates that the engine control module (ECM) has detected an issue with the throttle/pedal position sensor/switch “A” circuit. This code is specific to certain Hyundai Sonata models, and can cause serious issues with engine performance if not properly diagnosed and repaired. In this article, we will look at the general engine performance issues related to the P2122 code, as well as ignition and fuel system issues that may also be associated with it.

General Engine Performance Issues Related to the P2122 Code

The first symptom that a driver may notice when a P2122 code is present is decreased acceleration or stalling. This occurs because the ECM cannot accurately measure throttle position or power output due to a faulty signal from the throttle/pedal position sensor. As a result, the ECM cannot accurately adjust fuel mixture or ignition timing in order to optimize engine performance. Other symptoms that may be present include rough idling, misfires, hesitation during acceleration, and reduced fuel economy.

Ignition System Issues Related to the P2122 Code

In some cases, an incorrect signal from the throttle/pedal position sensor may cause erratic ignition timing which can lead to poor combustion and misfires. If this is left unchecked for too long it can cause permanent damage to spark plugs and other components of the ignition system. It is important to investigate any potential issues with the ignition system as soon as possible in order to avoid further damage down the road.

Fuel System Issues Related to the P2122 Code

A faulty throttle/pedal position sensor can also cause incorrect readings when it comes to fuel delivery by leading to an insufficient amount of fuel being delivered into the cylinders during combustion. This can lead to poor performance and reduce overall efficiency of your vehicle’s engine. In some cases, it can even lead to stalling which can be extremely dangerous while driving on public roads. It is important that any fuel system problems are addressed immediately in order for your vehicle’s engine performance to return back to normal levels.

It should be noted that these are only some of potential problems associated with a P2122 code on Hyundai Sonata models. In order for a proper diagnosis and repair plan, further diagnostic tests must be done in order identify any underlying issues before attempting any repairs or replacements of parts on your vehicle’s engine. Once these tests have been completed and all necessary repairs have been made, then you can return your vehicle back out on public roads with confidence knowing that you have taken all necessary steps towards restoring its normal operation levels once again!

FAQ & Answers

Q: What is the Hyundai Sonata P2122 Code?
A: The Hyundai Sonata P2122 code indicates an issue with the throttle/pedal position sensor/switch ‘B’ circuit, which affects the car’s ability to control its speed.

Q: What are the causes of the Hyundai Sonata P2122 Code?
A: Possible causes of the P2122 code in a Hyundai Sonata include a faulty throttle position sensor, a faulty pedal position sensor, an electrical issue with wiring or connectors, and an issue with the engine control module.

Q: What are the symptoms of the Hyundai Sonata P2122 Code?
A: Common symptoms of this code include illuminated check engine light, difficulty starting or accelerating, rough running engine, and poor fuel economy.

Q: What steps should be taken when diagnosing a Hyundai Sonata P2122 Code?
A: When diagnosing this code, it is important to check for common issues such as loose or corroded wiring and connectors. Additionally, diagnostic tests should be performed to determine if there is an issue with the throttle position sensor or pedal position sensor. The final step is to reset the system after repairs have been made.

Q: What are some engine performance issues related to a Hyundai Sonata P2122 Code?
A: Issues related to this code can include general engine performance issues such as difficulty starting or accelerating, rough running engine, and poor fuel economy. Additionally, ignition system issues such as misfiring spark plugs and clogged fuel injectors can occur. In some cases, fuel system issues such as clogged fuel filters may also be present.

The P2122 code for Hyundai Sonata is a diagnostic trouble code that indicates an issue with the vehicle’s throttle pedal position sensor. This code can be caused by a variety of issues, including a faulty sensor, wiring problems, or even a faulty ECU. If this code is present, it is important to diagnose and repair the problem in order to ensure the safety and reliability of the vehicle. With proper diagnosis and repair, drivers can rest assured that their Hyundai Sonata will continue to provide reliable performance for many miles to come.

Author Profile

Carl Frisch
Carl Frisch
With more than 30 years in the bicycle industry, I have a strong background in bicycle retailing, sales, marketing and customer service. I have a passion for cycling and a dedication to excellence. As a manager, I worked diligently to increase my capabilities and responsibilities, managing up to eleven mechanics (at Palo Alto Bicycles) and later as a working partner in my own store.

As the shop owner of Spoke n’ Word Cycles in Socorro, NM, the success of the mission was my responsibility, which I pursued passionately since we opened in 2003 through the spring of 2011. I am adept at managing owned and loan inventory, preparing weekly & annual inventory statements, and managing staff. The role as managing partner also allowed me tremendous freedom. I used this personal freedom to become more deeply involved in my own advancement as a mechanic, to spearhead local trail building, and advocating for cycling both locally and regionally.

As a mechanic, I have several years doing neutral support, experience as a team mechanic, and experience supporting local rides, races, club events. I consistently strive to ensure that bicycles function flawlessly by foreseeing issues and working with the riders, soigners, coaches and other mechanics. Even with decades of experience as a shop mechanic and team mechanic, and continue to pursue greater involvement in this sport as a US Pro Mechanic, and UCI Pro Mechanic.

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