P1190 Code? Here’s How to Fix It Quickly and Easily

P1190 is a manufacturer-specific powertrain code. Its exact definition depends entirely on the vehicle application, ranging from an engine vacuum leak to a throttle actuator fault.

This code identifies a detected system condition, not necessarily a failed component. Proper diagnosis requires verifying the exact factory definition and testing the relevant circuits or mechanical systems.

Key Takeaways

• The P1190 code is manufacturer-specific, commonly indicating an engine vacuum leak on GM, a calibration resistor fault on Ford, or a throttle actuator issue on Hyundai.
• Possible causes include intake duct leaks, failed sensors, damaged wiring, or a faulty throttle body assembly.
• Symptoms vary by application and may include an illuminated Check Engine Light, rough idle, reduced power, or stalling.
• Diagnosis requires confirming the exact factory definition and inspecting the specific intake, fuel, or electronic throttle systems.
• Repairs depend on the confirmed fault and may involve sealing intake leaks, replacing sensors, or servicing the throttle actuator.

P1190 Code Description and Implications

P1190 is a manufacturer-specific trouble code. Its exact definition depends entirely on the vehicle application.

Some General Motors (GM) applications: The code indicates an engine vacuum leak or an intake air duct leak. The PCM detects unmetered air entering the intake manifold, which disrupts the calculated air-fuel ratio.

Certain Ford applications: The code indicates a Calibration Resistor circuit fault or an out-of-range condition. This resistor is used by the PCM to identify the specific engine calibration and emissions configuration.

Some Hyundai and Kia applications: The code indicates an Intake Throttle Actuator malfunction. The electronic throttle control system detects a fault in the throttle body drive mechanism or its control circuit.

Common Causes of the P1190 Code

Several conditions can trigger this manufacturer-specific malfunction code. Identifying the exact cause requires inspecting the specific system identified by the factory definition.

• For GM applications: Cracked or disconnected intake air ducts, loose intake manifold bolts, or failed PCV system grommets and hoses causing unmetered air entry.
• For Ford applications: A damaged calibration resistor, corroded pins in the PCM connector, or wiring issues in the resistor identification circuit.
• For Hyundai applications: Carbon buildup binding the throttle plate, a failed throttle actuator motor, or damaged wiring in the electronic throttle control circuit.

Symptoms Associated With P1190

Symptoms vary depending on the specific system design and the underlying fault condition.

• Illuminated Check Engine Light.
• GM applications: Rough idle, fluctuating engine speeds, or lean fuel trim codes accompanying the vacuum leak.
• Ford applications: The vehicle may not exhibit drivability symptoms if the calibration resistor fault only affects emissions monitoring, or it may default to a base calibration.
• Hyundai applications: Reduced engine power, limp mode, hesitation during acceleration, or engine stalling if the electronic throttle body fails to operate correctly.

Diagnosing the P1190 Trouble Code

Diagnosis must begin by confirming the exact factory definition and inspecting the physical system components.

• Verify the exact manufacturer definition and locate the service information for the specific system monitor.
• For GM applications: Perform a thorough visual inspection of the intake air ducting between the MAF sensor and the throttle body. Use a smoke machine to pinpoint hidden vacuum leaks in the intake manifold and PCV system.
• For Ford applications: Inspect the PCM connectors for corrosion or pushed-back pins. Test the calibration resistor circuit for continuity and proper resistance values according to the wiring diagram.
• For Hyundai applications: Inspect the throttle body for heavy carbon deposits that may physically bind the throttle plate. Test the throttle actuator motor resistance and verify the control circuit wiring.

Repairing the P1190 Issue

Repairs depend entirely on the confirmed root cause of the system malfunction.

• If an intake air duct or vacuum hose is cracked or disconnected, replace the damaged components and ensure all clamps are properly secured.
• Clean or replace corroded connectors to restore proper electrical contact and circuit integrity.
• If the throttle body is contaminated with carbon, clean the bore and plate carefully using an appropriate throttle body cleaner, then perform the manufacturer’s idle relearn procedure.
• Replace confirmed failed electronic components, such as the throttle body assembly or calibration resistor, using a part meeting the correct vehicle specification.

Cost Considerations for P1190 Repairs

Cost depends on diagnostic time, component accessibility, required parts, programming requirements, and labor.

Repairing a vacuum leak or replacing a simple intake hose is generally less expensive than diagnosing complex PCM wiring faults or replacing and programming a complete electronic throttle body assembly.

Prevention Strategies for Future Occurrences

While mechanical and electrical failures are not always preventable, some maintenance practices can reduce the risk of system issues.

• Inspecting intake ducting and vacuum hoses during routine services can help identify developing cracks or loose connections before they cause unmetered air leaks.
• Keeping the throttle body clean by using quality fuel and occasionally cleaning the throttle plate can prevent carbon buildup that binds the actuator mechanism.

Troubleshooting Tips and Best Practices

Always consult the exact manufacturer service information for your vehicle’s specific definition and testing procedures.

• Do not assume the throttle body is faulty simply because the code mentions an actuator; physical binding from carbon or wiring faults must be ruled out first.
• For GM applications, avoid spraying carburetor cleaner indiscriminately to find vacuum leaks, as this can damage sensors and create fire hazards; a dedicated smoke machine is the safest and most accurate method.
• Verify technical service bulletins for your specific make and model, as some manufacturers issue updated intake manifold gaskets or revised throttle body part numbers for recurring faults.

More OBD-II Codes

Frequently Asked Questions

Is the P1190 code generic or manufacturer-specific?

No. P1190 is a manufacturer-specific code. Its exact definition varies by vehicle make, indicating a vacuum leak, calibration fault, or throttle actuator issue.

Can I drive my car with a P1190 code?

It depends on the application. If the code indicates an electronic throttle body failure on a Hyundai, the vehicle may enter limp mode or stall, making it unsafe to drive.

Will a vacuum leak cause a P1190 code on a GM vehicle?

Yes. On GM applications, P1190 specifically identifies an engine vacuum leak or intake air duct leak that allows unmetered air into the engine.

Can a dirty throttle body trigger the P1190 code?

Yes. On applications monitoring the electronic throttle actuator, heavy carbon buildup can physically bind the throttle plate, causing the motor to draw excessive current or fail to reach the target position.

Will a P1190 code cause an emissions test failure?

Yes. Any code that illuminates the Check Engine Light will cause an automatic failure during an OBD-II emissions inspection.

What Should You Do About the P1190 Code?

Confirm the exact factory definition for your specific vehicle application. Follow the applicable manufacturer diagnostic procedure to test the relevant intake, fuel, or electronic throttle systems.

Repair or replace the confirmed failed component or fix the identified leak, then retest the system to ensure proper operation.