P1518 Code - Intake Manifold Runner Control Stuck Open
Quick Answer
The Intake Manifold Runner Control (IMRC) is an electrically actuated system consisting of a motorized actuator with an attaching linkage for each housing on each bank. Common causes include Faulty Intake Manifold Runner Control (IMRC) actuator, Intake Manifold Runner Control actuator harness is open or shorted, Intake Manifold Runner Control actuator circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1518 indicates Intake Manifold Runner Control Stuck Open.
- Common causes
- Common causes include Faulty Intake Manifold Runner Control (IMRC) actuator, Intake Manifold Runner Control actuator harness is open or shorted, Intake Manifold Runner Control actuator circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1518 Description
What are the Possible Causes of the DTC P1518?
- Faulty Intake Manifold Runner Control (IMRC) actuator
- Intake Manifold Runner Control actuator harness is open or shorted
- Intake Manifold Runner Control actuator circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
How to Fix the DTC P1518?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1518 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- P1518 Audi — Main Relay Circuit Short to B+
- P1518 Buick — Throttle Actuator Control Module Performance
- P1518 Cadillac — Throttle Actuator Control Module Performance
- P1518 Chevrolet — Throttle Actuator Control Module Performance
- P1518 Ford — Intake Manifold Runner Control Stuck Open
- P1518 GMC — Throttle Actuator Control Module Performance
- P1518 Isuzu — Commanded Versus Actual Throttle Position Correlation Large Step Open
- P1518 Lincoln — Intake Manifold Runner Control Stuck Open
- P1518 Mazda — Intake Manifold Runner Control Stuck Open
- P1518 Mercury — Intake Manifold Runner Control Stuck Open
- P1518 Subaru — Starter Switch Circuit Low Input
- P1518 Volkswagen — Main Relay Circuit Short to B+
Frequently Asked Questions about P1518 Code
1. What does the OBDII code P1518 mean?
- The P1518 code indicates that the Intake Manifold Runner Control (IMRC) is stuck in the open position, which can affect engine performance by altering airflow.
2. What symptoms might I notice if my vehicle has the P1518 code?
- Symptoms can include a decrease in engine performance, rough idling, difficulty starting, and possibly an increase in fuel consumption.
3. What causes the P1518 code to be triggered in a vehicle?
- Causes can include a faulty IMRC actuator, damaged linkage, obstructions in the manifold runner, or electrical issues such as faulty wiring or a bad connection.
4. How can I fix the OBDII code P1518?
- Repairing this code may involve replacing the IMRC actuator, repairing any damaged linkages, clearing obstructions from the intake manifold runner, or addressing any electrical issues like replacing damaged wires or connectors.
5. Is it safe to drive a vehicle with the P1518 code?
- While you might be able to drive with this code, doing so can lead to decreased performance and increased fuel consumption. It's advisable to get the issue fixed to avoid potential long-term engine damage.
6. How is the IMRC diagnosed when addressing the P1518 code?
- Diagnosis typically involves using a scan tool to verify the code, visually inspecting the IMRC and its components, and checking the related electrical circuitry for faults.
7. Can a P1518 code cause a vehicle to fail emissions testing?
- Yes, since the IMRC affects how the engine manages airflow and combustion, a stuck open runner could lead to increased emissions, causing the vehicle to fail emissions tests.
8. What maintenance can prevent the P1518 code from occurring?
- Regular maintenance should include checking the operation of the IMRC system, ensuring that connections are clean and secure, and that there is no buildup of debris that might obstruct the movement of the manifold runners.
9. Are there specific makes or models that are more prone to experiencing the P15118 code?
- While any vehicle equipped with an IMRC system can experience this issue, it's more commonly reported in Ford and Mazda vehicles. Always check service bulletins for specific issues related to your model.
Discuss the causes and fixes for P1518 OBDII Code
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The exact location depends on the vehicle, engine, and how the intake manifold runner system is designed. The IMRC actuator is usually mounted on or very close to the intake manifold, with a linkage or shaft that operates the internal runner flaps.
If you can post the year, make, model, and engine size, I can point you to the exact location. Without that information, I’d just be guessing.
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