P1518 code — how to fix error fast

Usually, error codes of the OBD2 diagnostic system like P1518 are the worst kind since they point to problems with the engine and its performance, but that doesn’t mean you can’t easily fix them. This one seems to be pretty common among driver communities, so our team thought we’d give you a hand in figuring out the P1518 code meaning and consequences.

We wish to encourage you to instantly get to the solving time by giving you a few helpful tips on how to diagnose, fix, and prevent the issue without breaking the bank with expensive repairs.

Why you can trust REREV’s OBD2 code advice: Our automotive expert researchers with experienced mechanics undertakes a thorough research methodology to deliver precise insights on OBD codes. Find out more about OBD2 codes research process..

What does the P1518 code mean?

The P1518 code is a generic powertrain code, which means it applies to all makes and models of vehicles. Specifically, it indicates that there is an issue with the intake manifold runner control (IMRC) circuit in the engine. The IMRC is responsible for regulating the amount of air that enters the engine. When the IMRC circuit malfunctions, it can cause various issues with the engine’s performance, such as reduced power and poor fuel economy.

It’s important to understand the P1518 code because ignoring it can lead to more severe engine problems down the road. Additionally, fixing the code can improve your vehicle’s performance and fuel efficiency.

What causes the P1518 code?

Every code that a diagnostic device shows can be complex, and the same goes for this one. So, instead of just having one possible reason behind it, there are several things that may have affected your car to display the code. So, these are the most common reasons behind the code’s activation:

Faulty IMRC actuator

The IMRC actuator is responsible for controlling the position of the intake manifold runners. If the actuator is faulty, it can cause the IMRC circuit to malfunction, resulting in the P1518 code. Symptoms of a faulty actuator may include reduced power and poor fuel economy.

Failed IMRC solenoid

The IMRC solenoid is responsible for controlling the flow of the vacuum to the IMRC actuator. If the solenoid fails, it can cause the IMRC circuit to malfunction, resulting in the P1518 code. Symptoms of a failed solenoid may include rough idle and reduced power.

Wiring issues

The IMRC circuit is controlled by a series of wires. If any of these wires become damaged or disconnected, it can cause the circuit to malfunction, resulting in the P1518 code. Symptoms of wiring issues may include intermittent issues with engine performance.

Which car models does the P1518 code affect the most?

While this code can potentially affect any vehicle with an intake manifold runner control system, some models are more likely to experience this issue than others. We went through the records of NHTSA complaints to find some car models that are more susceptible to this code than others, so here’s what we found:

• Mazda 6: This vehicle is known to have issues with the intake manifold runner control system, which can cause the check engine light to come on and trigger the P1518 code.
• Toyota Tundra: n some cases, a malfunctioning system can cause the engine to stall or run poorly, leading to poor performance and reduced fuel efficiency and triggering the P1518 code in Toyota Tundra vehicles.
• Ford Mustang GT: The 5.0-liter V8-powered Mustang with an early version of the Coyote engine can also be susceptible to this code due to issues with the intake manifold system prone to damage.

How to diagnose the P1518 code

Diagnosing the code P1518 can be simple when using a scanner tool, but there are other methods that you can use as well. Some of them don’t even require much expertise or knowledge of the mechanics, so here’s what you can do to pinpoint the issue with the code:

Scan the vehicle’s computer for codes

The first step in diagnosing the P1518 code is to scan the vehicle’s computer for codes. This can be done using an OBD-II scanner, which can be purchased or rented from an auto parts store.

Inspect the IMRC actuator and solenoid

Next, inspect the IMRC actuator and solenoid for any signs of damage or wear. Check for proper voltage and continuity using a multimeter.

Inspect the wiring

Inspect the wiring for any signs of damage or wear, such as frayed or broken wires. Check for proper voltage and continuity using a multimeter.

How to fix the P1518 code

Once you have all the information about the root cause of the issue at your disposal, you can make use of one of the following solutions to fix the problem with the code and erase it:

Replace the IMRC actuator or solenoid

If either the IMRC actuator or solenoid is faulty, it will need to be replaced. The cost of replacement can vary depending on the make and model of your vehicle, but it typically ranges from $200 to $500.

Repair or replace damaged wiring

If there is damage to the wiring, it will need to be repaired or replaced. The cost of repair or replacement will depend on the extent of the damage and the make and model of your vehicle.

Seek professional help

If you’re not comfortable diagnosing or fixing the P1518 code yourself, it’s important to seek professional help. An experienced mechanic will have the tools and expertise needed to diagnose and fix the issue quickly and effectively.

How to prevent the P1518 code

Preventing the P1518 code requires proper maintenance and care of your vehicle. We know it can sound a bit too enthusiastic, but it’s the truth – sometimes simple maintenance tasks can do the trick. With that in mind, here’s what you can do to prevent the code P1518 from appearing in the future:

• Perform routine maintenance
• Perform regular oil changes and tune-ups
• Maintain the IMRC system
• Clean the intake manifold runners after regular inspections
• Check up on any signs of damage

Properly maintaining the IMRC system, such as cleaning the intake manifold runners and checking for any signs of wear or damage, can help prevent the P1518 code from occurring.

Our take

In conclusion, the P1518 code can be a frustrating issue for car owners, but it’s important to understand the cause and how to fix it. By following the steps outlined in this article, you can diagnose and fix the P1518 code quickly and effectively, or prevent it from occurring in the first place.

We hope that the professional advice of our experts will be enough to lead the way when dealing with this code and avoid haveing any troubles with a disrupted air/fuel ratio.