OBD2 Code P1518 Subaru: What You Need to Know

The OBD2 code P1518 in your Subaru indicates a problem with the Variable Valve Timing (VVT) system, specifically related to the “A” camshaft position actuator control circuit on bank 1. But what exactly does that mean, and how serious is it?

This comprehensive guide will delve into the P1518 Subaru code, explaining its causes, symptoms, diagnostic procedures, and potential solutions. We’ll equip you with the knowledge to understand this common Subaru issue and take appropriate action.

Understanding the P1518 Code

The P1518 code signals an issue with the signal being sent to or received from the VVT system on bank 1 of your Subaru’s engine. The VVT system optimizes engine performance and fuel efficiency by adjusting the timing of the intake and exhaust valves. The “A” camshaft typically refers to the intake camshaft, and bank 1 is the side of the engine where cylinder number one is located.

Subaru engine with the P1518 code

Common Causes of the P1518 Code in Subarus

While the P1518 code points to the VVT actuator control circuit, several underlying problems can trigger this fault. Here are some of the most common culprits:

Faulty Camshaft Position Actuator Solenoid: This solenoid controls the flow of oil to the camshaft actuator, adjusting valve timing. If it malfunctions, it can disrupt the signal and throw the P1518 code.
Wiring Issues: Damaged, corroded, or loose wiring in the actuator control circuit can interrupt communication between the actuator solenoid and the Engine Control Unit (ECU), leading to the P1518 code.
Oil Flow Problems: The VVT system relies on proper oil pressure and flow to operate correctly. Low oil levels, dirty oil, or a clogged oil passage can hinder actuator function and trigger the code.
Faulty Camshaft Position Sensor: While not directly implicated in the P1518 code, a malfunctioning camshaft position sensor can sometimes cause similar symptoms and should be considered during diagnosis.
ECU Malfunction: In rare cases, a faulty ECU can misinterpret signals from the VVT system, resulting in the P1518 code.

Symptoms of a P1518 Code

Identifying the symptoms associated with the P1518 code can help you diagnose the issue more accurately. Here’s what you might experience:

Check Engine Light: The most evident sign, the check engine light on your dashboard, will illuminate when the P1518 code is stored.
Rough Engine Idle: A malfunctioning VVT system can cause your engine to idle rough or erratically.
Reduced Engine Performance: You might notice a decrease in acceleration power and overall engine performance.
Poor Fuel Economy: As the VVT system plays a role in fuel efficiency, a problem can lead to increased fuel consumption.

Diagnosing the P1518 Code

Diagnosing the P1518 code requires a systematic approach to pinpoint the root cause. Here are the general steps to follow:

Read the Code: Use an OBD2 scanner to retrieve the stored trouble codes.
Inspect the Wiring: Carefully examine the wiring harness connected to the camshaft position actuator solenoid for any signs of damage, looseness, or corrosion.
Check Oil Level and Condition: Ensure the engine oil level is within the recommended range and the oil is clean.
Test the Solenoid: Use a multimeter to test the resistance of the camshaft position actuator solenoid and verify it falls within the manufacturer’s specifications.
Inspect for Oil Flow: Check for proper oil flow to the actuator. This may involve removing the actuator and inspecting for blockages in the oil passages.
Check the Camshaft Position Sensor: Although less likely, inspect the camshaft position sensor for any signs of damage or malfunction.
Consult a Professional: If you are unable to isolate the issue or are uncomfortable performing these diagnostics, it’s best to consult a qualified mechanic with experience in Subaru vehicles.

Mechanic using an OBD2 scanner to diagnose a car

Fixing the P1518 Code: Possible Solutions

Once you’ve identified the cause of the P1518 code, you can take steps to rectify the issue. Here are some potential solutions:

Replace the Camshaft Position Actuator Solenoid: If the solenoid is faulty, replacing it is often the most straightforward solution.
Repair Wiring Issues: Any damaged, corroded, or loose wiring in the actuator control circuit should be repaired or replaced as needed.
Address Oil Flow Problems: If low oil levels, dirty oil, or a clogged oil passage is causing the problem, an oil change, oil passage cleaning, or other related repairs might be necessary.
Replace the Camshaft Position Sensor: If the sensor is found to be faulty, replacement will be required.
Address ECU Issues: In rare instances where the ECU is malfunctioning, reprogramming or replacement may be necessary.

Frequently Asked Questions about the P1518 Subaru Code

Can I still drive my Subaru with the P1518 code?

While you may be able to drive short distances, it’s not recommended to continue driving with the P1518 code. Ignoring the issue can lead to further engine damage and more costly repairs.

How much does it cost to fix the P1518 code?

The repair cost can vary depending on the underlying cause and labor rates in your area. A faulty solenoid replacement is typically less expensive than addressing oil flow problems or ECU issues.

Can I prevent the P1518 code from recurring?

Regular engine maintenance, including timely oil changes with high-quality oil and addressing minor issues promptly, can help prevent VVT system problems and the recurrence of the P1518 code.

Taking Action: Get Your Subaru Back on Track

Understanding the OBD2 code P1518 is crucial for any Subaru owner. By recognizing the causes, symptoms, and diagnostic procedures, you can address the issue effectively and get back to enjoying your Subaru’s performance and reliability.

If you’re experiencing the P1518 code or other car diagnostic concerns, don’t hesitate to reach out to us! We have a dedicated team available 24/7 to assist you. You can contact us through WhatsApp at +1(641)206-8880 or send us an email at [email protected].