Hyundai Palisade, Kia Telluride & Sorento Throttle Body Issues: Stalling, Limp Mode & Replacement Costs (2017-2025)

Symptoms of a Failing Throttle Body

A faulty throttle body can cause a range of noticeable engine problems. Because it directly controls the air supply, any malfunction can disrupt the air-fuel mixture and lead to poor performance. Here are the most common signs that the throttle body in your Kia or Hyundai V6 may be failing:

• Check Engine Light: This is often the first indicator. The vehicle's computer monitors the throttle body's position and performance. If it detects a problem, it will trigger a warning light. Common diagnostic trouble codes (DTCs) associated with throttle body failure include P0121, P0222, P0638, P2110, P2118, P2119, and P2135.
• Limp Mode (Reduced Engine Power): To prevent potential engine damage, the vehicle's computer may put the car into a 'limp-home mode'. This will severely limit engine power and acceleration, making the vehicle feel very sluggish. A "Reduced Power" warning may also appear on the dashboard.
• Rough or Unstable Idle: A malfunctioning throttle body can't regulate airflow correctly at idle. This can cause the engine to idle too high, too low, or fluctuate unpredictably. You might feel shaking or notice the engine sounds like it's about to stall at a stoplight.
• Poor Acceleration or Hesitation: When you press the gas pedal, you may experience a delay or hesitation before the vehicle responds. This happens because the throttle plate isn't opening correctly to allow more air into the engine.
• Stalling: In more severe cases, the engine may stall completely, especially when coming to a stop or at low speeds. This can be dangerous in traffic.

Vehicle-Specific Issues, Recalls, and TSBs

This electronic throttle body, part number 35100-3L100, is shared across several popular models, including:

• 2020-2025 Hyundai Palisade (3.8L V6)
• 2020-2025 Kia Telluride (3.8L V6)
• 2019-2020 Kia Sorento (3.3L V6)
• 2019-2021 Kia Sedona (3.3L V6)
• 2017-2020 Kia Cadenza (3.3L V6)

Despite its wide use, research has not identified any specific recalls or widespread Technical Service Bulletins (TSBs) from Hyundai or Kia for premature failure of this specific throttle body on these V6 models. Most issues appear to be related to normal wear and tear of electronic components over time rather than a specific design flaw. Some owners of the Kia Telluride have reported a feeling of delayed throttle response, but this is often related to the vehicle's drive mode settings (like Eco mode) rather than a faulty part.

DIY Replacement and Relearn Procedure

Replacing the throttle body is a manageable job for a DIY mechanic with basic tools. The difficulty is low, and it typically takes less than an hour.

Replacement Steps:

1. Disconnect the Battery: Always disconnect the negative battery terminal before working on electronic components.
2. Remove the Air Intake Hose: Loosen the clamp holding the large plastic air intake hose to the throttle body and pull the hose off.
3. Disconnect the Electrical Connector: Carefully unplug the electrical connector from the throttle body.
4. Remove Mounting Bolts: There are typically four 10mm bolts holding the throttle body to the intake manifold. Remove these bolts.
5. Install the New Throttle Body: Clean the mounting surface on the intake manifold. Install the new or used throttle body with a new gasket. Torque the bolts to the manufacturer's specification.
6. Reconnect and Reassemble: Re-attach the electrical connector and the air intake hose. Reconnect the negative battery terminal.

Required Throttle Relearn/Calibration Procedure

After installing a new or used throttle body, you must perform a 'relearn' procedure. This allows the car's computer (ECM) to calibrate itself to the new part's closed and open positions. Skipping this step can lead to a high or erratic idle. Fortunately, this does not require a special scan tool for most Hyundai and Kia vehicles.

Simple Relearn Method:

1. Ensure the engine is warmed up.
2. Turn the ignition to the 'ON' position (do not start the engine). For push-button start, press the button twice without your foot on the brake.
3. Leave it in the 'ON' position for 10-15 seconds. You may hear the new throttle body making slight movements as it calibrates.
4. Turn the ignition 'OFF' and wait for 10 seconds.
5. Repeat this on/off cycle a few times before starting the engine.

If the simple method doesn't resolve an idle issue, a full ECU reset by disconnecting the battery's negative terminal for about 15 minutes can also work.

Buying a Used Fuel Injection Throttle Body

A used OEM throttle body can be a reliable and cost-effective alternative to an expensive new part. Since these are electronic components, a visual inspection is key. Here’s what to look for:

• Verify the Part Number: Make sure the part number is an exact match: 35100-3L100.
• Inspect the Electrical Connector: Check the pins inside the electrical connector. They should be straight, clean, and free of any corrosion or green buildup. Damaged pins are a major red flag.
• Check the Throttle Plate: Look inside the bore. The butterfly valve (throttle plate) should be relatively clean. Manually push it open; it should move smoothly without sticking or binding and spring back shut cleanly.
• Look for Physical Damage: Inspect the housing for any cracks, deep gouges, or signs that it has been dropped. Ensure all mounting points are intact.
• Consider the Source: Purchase from a reputable seller that offers a warranty. A warranty provides peace of mind that you can get a replacement if the part is defective.

Cost Comparison

The cost to replace a throttle body can vary significantly depending on the parts source and labor rates. Here is a general breakdown of expected costs:

Legal and Emissions Requirements

The throttle body is a key component of the emissions system because it regulates the air-fuel ratio. A malfunctioning throttle body will cause a Check Engine Light, which will result in an automatic failure of an emissions inspection in states that require it. However, unlike catalytic converters, throttle bodies are generally not subject to California Air Resources Board (CARB) compliance rules, meaning there are no separate 'California' and 'Federal' emissions variants of this part.

Frequently Asked Questions