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P3491 Dodge Code - Cylinder 12 Deactivation/Intake Valve Control Circuit Low

Quick Answer

The P3491 diagnostic trouble code (DTC) for Dodge vehicles indicates an issue with the Cylinder 12 Deactivation/Intake Valve Control Circuit being low. Common causes include Faulty intake valve control solenoid, Wiring issues or shorts in the control circuit, Faulty cylinder deactivation solenoid. 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
P3491 Dodge indicates Cylinder 12 Deactivation/Intake Valve Control Circuit Low.
Common causes
Common causes include Faulty intake valve control solenoid, Wiring issues or shorts in the control circuit, Faulty cylinder deactivation solenoid.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P3491 Dodge Description

The P3491 diagnostic trouble code (DTC) for Dodge vehicles indicates an issue with the Cylinder 12 Deactivation/Intake Valve Control Circuit being low. In modern vehicles, cylinder deactivation is a technology used to improve fuel efficiency by shutting off certain cylinders when they are not needed, such as during light load conditions. The intake valve control circuit is responsible for managing the opening and closing of the intake valves in the engine. When this circuit is deemed to be operating at a low level, it can affect the performance of the vehicle.

OBDII Code P3491 Dodge - Cylinder 12 Deactivation/Intake Valve Control Circuit Low
P3491 Dodge Code - Cylinder 12 Deactivation/Intake Valve Control Circuit Low

Common Causes of P3491 Dodge

  1. Faulty intake valve control solenoid
  2. Wiring issues or shorts in the control circuit
  3. Faulty cylinder deactivation solenoid
  4. Engine control module (ECM) malfunction
  5. Mechanical issues with the cylinder deactivation system

Symptoms of P3491 Dodge

  1. Check Engine Light illuminated on the dashboard
  2. Reduced engine performance
  3. Rough idling or vibrations
  4. Misfires
  5. Decreased fuel efficiency

How to Fix P3491 Dodge

  1. Diagnose the issue using a scan tool to retrieve the specific trouble code and further information.
  2. Inspect the intake valve control solenoid, wiring, and cylinder deactivation system for any visible damage or malfunctions.
  3. Test the electrical circuits for proper voltage, continuity, and resistance to identify any faulty components.
  4. Replace any faulty components such as the intake valve control solenoid, cylinder deactivation solenoid, or repair any damaged wiring as needed.
  5. Clear the trouble code from the ECM's memory and perform a final test drive to ensure the issue has been resolved.

Cost to Fix P3491 Dodge

The typical repair costs for addressing a P3491 code can vary depending on the specific cause of the issue and the cost of parts and labor. In general, the cost can range from $200 to $600 for parts and labor. It's important to note that labor rates at auto repair shops can vary, typically ranging between $80 and $150 per hour. Additional costs may apply if further diagnosis or repairs are needed. It's recommended to consult with a trusted mechanic for a more accurate cost estimate based on your vehicle's make and model.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P3491 Dodge Code

1. What are the common symptoms of OBDII code P3491 in a Dodge vehicle?

Symptoms may include engine misfires, rough idling, reduced power and acceleration, and possible stalling.

2. What can cause the OBDII code P3491 to trigger in a Dodge?

The code P3491 typically indicates a problem with the cylinder 12 deactivation or intake valve control circuit, which can be caused by wiring issues, faulty solenoids, or a malfunctioning PCM.

3. How serious is the OBDII code P3491 in a Dodge vehicle?

While the vehicle may still be operable, it is not recommended to ignore this code as it can lead to further engine damage and reduced fuel efficiency if left unresolved.

4. What are some possible DIY repair tips for OBDII code P3491 in a Dodge?

DIY repairs may include checking and repairing any damaged wiring, replacing faulty solenoids, and ensuring proper connections in the intake valve control circuit.

5. Can driving with the OBDII code P3491 in a Dodge cause further damage?

Continuing to drive with this code present can potentially cause damage to the engine, so it is advisable to address the issue promptly.

6. How much does it typically cost to repair OBDII code P3491 in a Dodge at a professional mechanic?

Repair costs can vary depending on the exact cause of the issue, but expect to pay anywhere from $200 to $600 at a dealership or repair shop.

7. Is it safe to reset the OBDII code P3491 in a Dodge using a diagnostic scanner?

While resetting the code may temporarily turn off the check engine light, it will not fix the underlying issue causing the code to trigger in the first place.

8. Can a faulty oxygen sensor trigger the OBDII code P3491 in a Dodge?

While possible, a faulty oxygen sensor is not a common cause of the code P3491. It is more likely related to an issue with the cylinder 12 deactivation or intake valve control circuit.

9. Can a clogged catalytic converter cause the OBDII code P3491 in a Dodge?

A clogged catalytic converter is not a direct cause of the code P3491, but it can contribute to related issues that may trigger the code, such as engine misfires.

10. Is it recommended to continue driving a Dodge with the OBDII code P3491 if the symptoms are not severe?

It is not recommended to continue driving the vehicle with this code present, as it can lead to further complications and potentially more costly repairs in the future.

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