P1514 is a manufacturer-specific powertrain code. Its exact definition and the monitored system depend entirely on the vehicle make and model.
Because it applies to entirely different systems across manufacturers, the exact factory definition must be verified before diagnosis. This code identifies a detected fault condition but does not automatically prove that a specific component has failed.
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Key Takeaways
- P1514 is a manufacturer-specific code with entirely different meanings depending on the vehicle make and application.
- On many GM applications, it indicates an airflow to throttle position sensor correlation fault or throttle actuator control performance issue.
- On certain Ford applications, it may indicate a high load neutral or drive fault, while Volkswagen applications use it for an intake manifold changeover valve circuit fault.
- Accurate diagnosis requires verifying the exact factory definition for your specific vehicle before testing any components.
P1514 Code Description and Implications
P1514 is a manufacturer-specific diagnostic trouble code. Because it is not standardized across all vehicles, its exact definition and the monitored system depend entirely on the manufacturer and application.
Some GM, Chevrolet, and Cadillac applications: P1514 is defined as Airflow to TP Sensor Correlation High or Throttle Actuator Control (TAC) System Mass Air Flow Performance. The powertrain control module detects that the actual airflow measured by the MAF or MAP sensor does not correlate with the expected airflow for the current throttle position.
Certain Ford and Mazda applications: P1514 indicates a High Load Neutral/Drive Fault. The control module detects an abnormal condition related to engine load while the transmission is in neutral or drive.
Specific Volkswagen and Audi applications: P1514 represents an Intake Manifold Changeover Valve 2 Circuit Short to Ground. The engine control module detects an electrical short to ground in the control circuit for the secondary intake manifold runner or flap actuator.
Common Causes of the P1514 Code
Because P1514 applies to entirely different systems depending on the vehicle, the possible causes vary significantly by application.
For GM airflow correlation applications: Possible causes include a failing mass airflow (MAF) sensor, a faulty manifold absolute pressure (MAP) sensor, severe carbon buildup restricting the throttle body, or an unmetered intake air leak.
For Ford high load applications: A failing transmission range sensor, abnormal engine load conditions, or issues with the powertrain control module logic can trigger this code.
For VW/Audi intake manifold applications: A failed intake manifold changeover valve actuator, damaged wiring in the valve control circuit, or a corroded connector at the valve can cause the short-to-ground condition.
Symptoms Associated With P1514
Symptoms depend heavily on which system the code is monitoring in your specific vehicle.
On GM applications monitoring airflow correlation, the engine may enter a reduced-power limp mode, exhibit poor acceleration, or stall.
On applications monitoring intake manifold runners, the engine may lack low-end torque, run roughly at specific RPM ranges, or exhibit decreased fuel efficiency.
An illuminated Check Engine Light or a “Reduced Engine Power” message may appear, though MIL behavior and additional warning lights vary by manufacturer and system architecture.
Diagnosing the P1514 Trouble Code
Diagnosis must begin by confirming the exact factory definition for your specific make, model, and engine using manufacturer service information.
Retrieve the code and record any freeze-frame data or related error code using a scan tool capable of reading manufacturer-specific data.
For GM airflow correlation applications, monitor live MAF, MAP, and throttle position data while driving to identify which sensor signal is failing to correlate with the others, and inspect the intake tract for vacuum leaks.
For VW/Audi intake manifold applications, test the electrical resistance of the changeover valve actuator and check the control circuit for continuity and a short to ground according to the manufacturer wiring diagram.
Repairing the P1514 Issue
Repairs must follow the confirmed root cause identified during system-specific testing.
If a MAF or MAP sensor fails the manufacturer diagnostic procedure on a GM application, replace the confirmed faulty sensor and clear the codes.
If severe carbon buildup is restricting the throttle plate, cleaning the throttle body with an approved cleaner may restore proper airflow correlation.
If the intake manifold changeover valve actuator fails electrical testing on a VW/Audi application, replace the valve assembly or repair the shorted wiring harness.
Always repair any damaged wiring or corroded connectors found during the diagnostic process before replacing major control modules.
Cost Considerations for P1514 Repairs
Repair costs for P1514 vary widely based on the underlying fault, the specific vehicle application, and local labor rates.
Cleaning a throttle body or repairing a damaged wire involves lower parts costs and moderate labor time.
Diagnosing and replacing an integrated intake manifold assembly with internal changeover flaps or replacing a complete throttle body assembly may require significantly more labor time depending on component accessibility.
Diagnostic time, required programming or relearn procedures, and exact parts pricing all influence the final expense.
Prevention Strategies for Future Occurrences
Preventative measures depend on the specific system monitored by your vehicle’s application of this code.
On applications using a throttle body and MAF sensor, adhering to the manufacturer’s maintenance schedule for air filter replacement and using quality fuel can help reduce carbon buildup and sensor contamination.
Keeping electrical connectors clean and ensuring wiring harnesses near hot intake manifold components are securely routed can help prevent circuit-related faults on changeover valve systems.
Troubleshooting Tips and Best Practices
Never assume P1514 relates to the throttle body or airflow sensors without first verifying the exact manufacturer definition for your vehicle.
Check for applicable technical service bulletins or software updates, as some manufacturers release PCM recalibrations to address false correlation or airflow calculation codes.
If multiple airflow or fuel trim codes are present alongside P1514 on a GM vehicle, inspect the entire intake tract for unmetered air leaks before replacing individual sensors.
Verify that all aftermarket intake components, such as cold air intake kits, are properly sealed and not causing turbulence that interferes with the MAF sensor reading.
More OBD-II Codes
| P1513 | P1512 | P1511 | P1506 |
| P1498 | P1488 | P1516 | P1518 |
| P1519 | P1520 | P1521 | P1524 |
| P0100 | P0101 | P0121 | P2100 |
| P0102 | P0107 | P0222 | P2101 |
| P1525 | P1529 | P2102 | P2103 |
Frequently Asked Questions
Is P1514 a generic or manufacturer-specific code?
No. P1514 is a manufacturer-specific code. Its exact definition and the monitored system depend entirely on the vehicle make, model, and application.
Can a dirty throttle body cause a P1514 code?
Yes. On certain GM applications where P1514 indicates an airflow to throttle position correlation fault, severe carbon buildup restricting the throttle plate can trigger this code.
Will P1514 put my car in limp mode?
Depending on the application, yes. On vehicles where P1514 monitors the throttle actuator control or electronic throttle system, the engine may enter a reduced-power limp mode as a safety precaution.
Is it safe to drive with the P1514 code active?
It depends on the underlying fault. If the code relates to a throttle correlation or intake manifold fault, the engine may stall or lack power. Always verify the exact application before driving.
Does P1514 always mean the MAF sensor is bad?
No. While some GM applications use P1514 for airflow correlation issues that may involve the MAF sensor, many other manufacturers use this code for intake manifold valves or transmission load faults. Never replace the MAF sensor without confirming the exact factory definition.
What Should You Do About the P1514 Code?
Confirm the exact factory definition and technical service bulletins for your specific vehicle application.
Follow the applicable manufacturer diagnostic procedure to test the relevant airflow sensors, throttle actuator control system, or intake manifold components based on your vehicle’s specific system architecture.
Repair or replace the confirmed failed component, then retest the system to ensure the code does not return.
