The P3491 fault code in automobiles indicates a problem with the Cylinder Deactivation Solenoid.

This can be caused by low oil pressure, restricted oil passage, or a faulty solenoid.

The engine light will turn on as a symptom of this issue. It is important to address this problem promptly as it can lead to further engine damage.

The repair difficulty is moderate, with a repair time of 1.0.

To fix the issue, one should visually inspect the wiring harness and connectors, check for damaged components, and look for broken or corroded connector pins.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level10.0 (Out of 10)

If you notice the Engine Light ON (or Service Engine Soon Warning Light), it could be due to the p3491 fault code.

Here are the symptoms to look out for:

  • The P3491 fault code in an automobile can cause the following symptoms: Engine Light ON, Service Engine Soon Warning Light ON, engine misfire, rough engine idle, reduced engine power, poor acceleration, and increased fuel consumption.
  • It is important to address these symptoms promptly to avoid further damage to the vehicle.

The automobile fault code P3491 can be caused by a variety of factors, including low oil pressure and faulty solenoids.

  • The automobile fault code P3491 can be caused by low oil pressure, restricted oil passage, engine mechanical condition, faulty Cylinder Deactivation Solenoid, Cylinder Deactivation Solenoid harness being open or shorted, and Cylinder Deactivation Solenoid circuit having poor electrical connection.
  • It is important to identify the specific cause of the fault code in order to properly diagnose and fix the issue.

Below are the possible fixes for the automobile fault code p3491, including inspecting wiring harness and connectors for damage or corrosion.

  • To fix the automobile fault code p3491, first, check the possible causes listed above.
  • Then, visually inspect the related wiring harness and connectors.
  • Look for any damaged components and check for broken, bent, pushed out, or corroded connector’s pins.
  • This fix will take an estimated repair time of 1.0 hour.

The automobile fault code P3491 can be diagnosed and fixed within an estimated repair time of 1.0 hour. The cost of repair is influenced by the repair time, which is commonly charged between $75 and $150 per hour by most auto repair shops.

Therefore, the total cost of fixing the P3491 fault code will depend on the hourly rate charged by the repair shop and the estimated repair time required to fix the issue.

The P3491 code refers to the cylinder deactivation system in the engine. The Engine Control Module (ECM) commands the system to deactivate certain cylinders to improve fuel economy. The deactivation is achieved by not allowing the intake and exhaust valves to open on the selected cylinders.

The deactivation lifters contain spring-loaded locking pins that connect the internal pin housing of the lifter to the outer housing. The locking pins are pushed inward with engine oil pressure directed from the valve lifter oil manifold (VLOM) assembly solenoids.

Switching between V8 and V4 mode is accomplished in less than 250 milliseconds. The P3491 code specifically indicates an issue with the cylinder 12 deactivationintake valve control circuit being low.

What are the possible causes of the P3491 automobile fault code?

If you see the Engine Light ON or Service Engine Soon Warning Light, it could be due to the P3491 fault code. This code can be caused by low oil pressure, restricted oil passage, engine mechanical condition, faulty Cylinder Deactivation Solenoid, Cylinder Deactivation Solenoid harness being open or shorted, or Cylinder Deactivation Solenoid circuit having a poor electrical connection. To fix this issue, check the possible causes listed above, visually inspect the related wiring harness and connectors, and look for damaged components and broken, bent, pushed out, or corroded connector’s pins.

How can I visually inspect the related wiring harness and connectors to fix the P3491 fault code?

To fix the P3491 fault code, start by checking the possible causes listed above. Then, visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector’s pins. This will help you identify any issues with the Cylinder Deactivation Solenoid harness and circuit poor electrical connection.

What are the potential consequences of ignoring the P3491 fault code?

Ignoring the P3491 fault code, which indicates a problem with the Cylinder Deactivation Solenoid, can lead to serious consequences such as reduced fuel efficiency, engine damage, and even engine failure. The cause of the fault code can be due to low oil pressure, restricted oil passage, or a faulty solenoid, among other things. It is important to visually inspect the wiring harness and connectors and check for damaged components to prevent further damage.

p3491 error fault code explained

If you see the Engine Light ON or Service Engine Soon Warning Light, it could be due to low oil pressure, restricted oil passage, or a faulty Cylinder Deactivation Solenoid.

Check the possible causes listed above, visually inspect the wiring harness and connectors, and look for damaged components or corroded pins.

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