P0068 on 2013-2018 Hyundai Santa Fe 2.4L: MAP/Throttle Position Correlation Causes and Fixes

What's Unique About the 2013-2018 Hyundai Santa Fe

The 2.4L GDI (Gasoline Direct Injection) engine used in the Santa Fe Sport is a speed-density system, meaning it relies heavily on the MAP sensor for air-fuel calculations instead of a Mass Airflow (MAF) sensor. GDI engines are also prone to carbon buildup in the intake and on the throttle body, which can restrict airflow and cause the throttle plate to stick, directly leading to the P0068 correlation error. Therefore, a dirty throttle body is a very common cause on this specific engine.

Symptoms You May Notice

• Rough or unstable idle
• Hesitation or sluggish acceleration
• Check Engine Light is on
• Poor fuel economy
• Engine may stall, especially when stopping
• Black smoke from the exhaust in some cases
• Difficulty starting the engine

Most Likely Causes

1. Dirty Throttle Body 🔴 High Probability The 2.4L GDI engine's PCV (Positive Crankcase Ventilation) system can route oil vapors and carbon back into the intake, which builds up on the throttle plate over time, restricting movement and airflow. This is a well-documented issue for which Hyundai released a TSB.
   How to confirm: Remove the air intake hose from the throttle body and visually inspect the throttle plate and bore for a thick layer of black carbon.
   Typical fix: Clean the throttle body thoroughly with a dedicated throttle body cleaner and a soft brush or rag. A cleaning procedure is often recommended by Hyundai before replacement, as per TSB 13-FL-002.
   Est. part cost: $10-$20 for cleaner
2. Faulty Manifold Absolute Pressure (MAP) Sensor 🔴 High Probability The MAP sensor is a critical input on this engine, and like any electronic sensor, it can fail with age and heat cycles, providing incorrect pressure readings to the ECU. It is a very common failure point on the Theta II engine.
   How to confirm: After confirming the throttle body is clean, the next step is often to replace the MAP sensor. A more advanced diagnosis involves using a scan tool to monitor the MAP sensor voltage/pressure reading at idle and with the engine off to see if it's within specification. A visual inspection may reveal the sensor is fouled with carbon or even fuel.
   Typical fix: Replace the MAP sensor. It is typically mounted directly on the intake manifold with a single 10mm bolt.
   Est. part cost: $40-$100
3. Vacuum Leak 🟡 Medium Probability Vacuum hoses can become brittle and crack over time, and intake manifold gaskets can fail, allowing unmetered air to enter the engine. This extra air will cause the MAP sensor reading to conflict with what the ECU expects based on throttle position. A stuck-open PCV valve can also be a source of a significant vacuum leak.
   How to confirm: Visually inspect all vacuum lines connected to the intake manifold for cracks or disconnections. A smoke test is the most effective way to find hard-to-see leaks. Listen for a hissing or whistling noise from the engine bay.
   Typical fix: Replace the cracked hose or leaking gasket.
   Est. part cost: $10-$50
4. Damaged Wiring or Connector ⚪ Low Probability The wiring to the MAP sensor or throttle body can be damaged from engine vibration, heat, or improper service. The MAP sensor connector is particularly vulnerable to being pulled by its wires during other service.
   How to confirm: Visually inspect the wiring harnesses and connectors for the MAP sensor and throttle body. Check for frayed wires, loose pins, or corrosion. Ensure the connector is fully seated.
   Typical fix: Repair the damaged section of wiring or replace the connector pigtail.
   Est. part cost: $15-$40

Diagnosis Steps

1. Scan for any other trouble codes. Address any other codes first, especially those related to specific sensors.
2. Visually inspect the air intake system between the air filter and the throttle body for any loose clamps or torn boots.
3. Remove the air intake hose and inspect the throttle body for carbon buildup. If it is dirty, clean it thoroughly using throttle body cleaner and a soft rag, as outlined in TSB 13-FL-002.
4. After cleaning, perform a throttle body relearn procedure. A common method is to turn the ignition to 'ON' (engine off) for 15 seconds, then 'OFF' for 15 seconds. Repeat this 4-5 times before starting the engine. Alternatively, disconnecting the negative battery terminal for 15-30 minutes can also reset the ECU's adaptive memory.
5. If the code returns, inspect the vacuum hoses connected to the intake manifold for any cracks, breaks, or loose fittings. Pay attention to the PCV hose.
6. Inspect the electrical connector and wiring for the MAP sensor. Ensure it is securely connected and free of damage or corrosion.
7. If the throttle body is clean and there are no vacuum leaks or wiring issues, the most likely cause is a faulty MAP sensor. Replace the MAP sensor.
8. If the problem persists, a more advanced diagnosis of the throttle body's internal motor or the PCM may be required.

Parts You'll Likely Need

• Manifold Absolute Pressure (MAP) Sensor (OEM #39300-2G000) — This sensor is the most common part to fail that causes a P0068 code after a dirty throttle body has been ruled out.
  Trusted brands: Hyundai (OEM), Bosch, Delphi, Standard Motor Products (SMP), Walker Products
  OEM price range: $80-$150
  Aftermarket price range: $40-$100
• Throttle Body Assembly (OEM #35100-2G700) — If cleaning the throttle body doesn't resolve the issue and the internal electronics (motor or position sensor) have failed, the entire assembly must be replaced.
  Trusted brands: Hyundai (OEM), Hitachi, Cardone (remanufactured)
  OEM price range: $350-$500
  Aftermarket price range: $150-$250

Related Codes That Often Appear With This One

• P0106 — This code specifically points to a MAP/Barometric Pressure Circuit Range/Performance problem, which is a very common companion code or alternative to P0068, as both relate to implausible MAP sensor readings.
• P0069 — This code indicates a MAP - Barometric Pressure Correlation issue, often triggered by the same faulty MAP sensor that causes P0068.

Technical Service Bulletins (TSBs) & Recalls

• 13-FL-002: Provides a specific cleaning procedure for the Electronic Throttle Control (ETC) throttle body, recommending cleaning before replacement for various drivability issues.
• 17-ST-001: Details the replacement of the flexible steering coupler to fix a common clicking noise when turning. While unrelated to P0068, it's a critical TSB for owners of this platform.
• TSB Bulletin #21-01-041H: While issued for other models like the Elantra, this bulletin notes a software update for the Engine Control Module (ECM) to revise the logic for P0068 correlation errors.
• TSB Bulletin #20-01-028H: This manufacturer record indicates that P0068 and P0106 codes may be stored in the ECU in conjunction with transmission-related conditions requiring an IVT replacement.
• TSB Bulletin #Campaign T5B Dea: A manufacturer service bulletin describing instances where ECU DTC codes P0068 and P0101 are present alongside various transmission control unit codes.

Platform-Specific Known Issues

• Hyundai issued a Technical Service Bulletin (TSB 13-FL-002) that advises cleaning the electronic throttle body as a first step for issues like rough idle or stalling, which are symptoms of P0068.
• The 2.4L GDI engine was subject to recalls and a major class-action lawsuit for connecting rod bearing wear, which could lead to catastrophic engine failure. This is often preceded by a knocking noise and code P1326. A Knock Sensor Detection System (KSDS) software update was released to monitor for early signs of failure and provides a lifetime warranty on the short block if the update was performed.

Mechanic-Grade Diagnostic Values

• MAP Sensor Voltage (Key On, Engine Off) — expected: ~4.5V - 5.0V. Failure: Voltage significantly lower than 4.5V, or not matching the BARO sensor reading on a scan tool.
• MAP Sensor Voltage (Engine at Idle) — expected: ~1.0V - 1.5V. Failure: Voltage is stuck high (near KOEO reading) or does not respond to changes in engine load.
• MAP Sensor 5V Reference Wire — expected: 4.8V - 5.2V. Failure: Voltage is missing or significantly lower than 4.8V, indicating a wiring or PCM issue.
• Throttle Position Sensor (TPS) Voltage at Closed Throttle — expected: ~0.2V - 0.8V. Failure: Voltage is zero, or significantly higher than 0.8V when the throttle is closed.
• Throttle Position Sensor (TPS) Voltage at Wide Open Throttle (WOT) — expected: ~4.3V - 4.8V. Failure: Voltage does not reach over 4.0V or has dead spots/dropouts as the throttle is opened.
• Throttle Position Sensor (TPS) Internal Resistance — expected: 2 kΩ ± 20%. Failure: Resistance is open (infinite) or far outside the specified range.

Scan Tool Commands That Help

• Hyundai GDS (or equivalent professional scanner): Throttle Body / ETS Reset — This function should be used after cleaning or replacing the throttle body to reset its learned idle and off-idle positions. Failure to do so can cause an unstable idle or a persistent P0068 code.
• Manual Procedure (No Scan Tool): Throttle Position Relearn — After cleaning the throttle body or disconnecting the battery. With the engine warm, turn the ignition to 'ON' (engine off) for 10-15 seconds, then 'OFF' for 10-15 seconds. Repeat 4-5 times. This allows the ECU to relearn the closed throttle position.

Wiring & Ground Locations

• MAP Sensor Connector/Harness — On the front of the intake manifold, near the radiator fan.. The wiring is susceptible to damage from the radiator fan if not secured properly. It is also frequently damaged by technicians pulling on the wires instead of the connector body during disconnection, which can break internal connections and cause this code.
• Engine Harness Chafe Points (General) — Inspect harness routing near sharp metal edges like the ECM/TCM bracket, areas of engine movement like near the upper control arm, and around fixed studs like shock tower bolts.. While no specific TSB for this exact chafe point on the Santa Fe was found, harness chafing is a common cause of intermittent electrical faults. A short in the MAP or TPS sensor circuits could trigger P0068. The pattern is well-documented on other vehicles and is a key inspection point for experienced technicians.

Real Owner Repair Stories

• Reddit user comment (Hyundai with a similar GDI engine) — Intermittent P0068 code.
  ❌ Tried (didn't work) Initial diagnosis assumed common causes like vacuum leaks or throttle body issues., Cleaning the contaminated MAP sensor.
  ✅ What actually fixed it The MAP sensor was found to be covered in carbon/sludge from the PCV system. Replacing the MAP sensor resolved the code, as cleaning was ineffective.

OEM Part Supersession History

• 39300-2G000 → 39300-84400 — Standard part update/revision by the manufacturer.

Model Year Variations Within This Range

• 2017-2018: The 2017 model year received a facelift, and the 2.4L GDI engine was rated at 185 hp, down slightly from the 190 hp in 2013-2016 models. This change does not affect the diagnosis or common causes of code P0068, as the core engine architecture and relevant sensors remained the same.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• Catastrophic Engine Failure (Rod Bearing Wear) 🔴 High — Widespread across millions of 2011-2019 vehicles with the Theta II GDI engine. Can occur at various mileages, often preceded by a knocking noise and/or code P1326. (Ref: Multiple recalls (e.g., NHTSA 20V-746) and a major class-action lawsuit settlement (In re: Hyundai and Kia Engine Litigation) resulted in a lifetime warranty for the engine short block for affected vehicles that received the Knock Sensor Detection System (KSDS) software update (Service Campaign 953).)
• Worn Steering Coupler 🟠 Medium — Very common. Owners typically notice a clicking or 'thud' sound from the steering column when turning the wheel, which gets progressively worse. It is often mistaken for a more serious suspension issue. (Ref: TSB 17-ST-001 describes the replacement procedure for the flexible rubber coupler (Part # 56315-2K000-FFF).)
• Peeling White Paint 🟡 Low — Common on vehicles with white paint, especially 'White Pearl'. Paint can bubble and peel off in large sheets from the roof, hood, and other panels, often after the standard paint warranty has expired. (Ref: Hyundai USA offered a warranty extension for some models/years, but many owners report difficulty getting coverage. A class-action lawsuit was filed in Quebec over the issue.)
• High Oil Consumption 🟠 Medium — Frequently reported by owners, sometimes as a precursor to more serious engine issues. Some owners report burning as much as a quart of oil every 1,000 miles.

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A complete Throttle Body Assembly is a good candidate for a used part, as a new OEM unit is expensive. An engine wiring harness can also be sourced from a donor vehicle if it is in pristine condition.

Donor-vehicle mileage cap: roughly under 80000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• For wiring harnesses, inspect every connector for broken locking tabs, bent pins, or corrosion. Avoid any harness with signs of previous tape/splicing repairs or heat damage.
• For a throttle body, ensure the throttle plate is relatively clean and moves smoothly without binding.
• Never source parts from a vehicle that experienced a fire or flood.

Aftermarket brands forum-validated for this vehicle:

• For MAP Sensor: Delphi, NGK (also sold as NTK), Standard Motor Products (SMP).

Brands owners have reported issues with on this vehicle:

• Unnamed or 'white-box' electronic sensors. For critical sensors like the MAP, paying a small premium for a reputable brand is advised to avoid premature failure and repeat diagnostics.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P1326 — Often associated with the Theta II engine's Knock Sensor Detection System (KSDS) and potential rod bearing failure, which is a known major issue for this vehicle platform.
• P0106 — A related MAP sensor performance code that may trigger alongside P0068 if the sensor is fouled by carbon or fuel.
• P0507 — Often occurs with P0068 when a dirty throttle body or vacuum leak causes an unstable or higher-than-expected idle.
• P0171 — A lean condition code that can be triggered by the same vacuum leaks or stuck-open PCV valves that cause P0068 correlation issues.

Frequently Asked Questions