AutoCodes – Dodge – P0491 Dodge

P0491 Dodge Code - Secondary Air Injection System Insufficient Flow Bank 1

Quick Answer

An air pump is used on the vehicle to lower tail pipe emissions on start-up. Common causes include Intake leak, Damaged AIR system components, Faulty AIR Solenoid Valve. 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: P0491 Dodge indicates Secondary Air Injection System Insufficient Flow Bank 1.
Common causes: Common causes include Intake leak, Damaged AIR system components, Faulty AIR Solenoid Valve.
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.

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Code Popularity 1,343

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 25, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0491 Dodge Description

An air pump is used on the vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module (PCM) grounds the Air pump relay control circuit which energizes the Air pump. The PCM also grounds the Air combination valve vacuum control solenoid circuit, which energizes the Air vacuum control solenoid. Vacuum is then applied to both Air combination valve diaphragms which opens the shut off valves. The PCM enables both circuits simultaneously when Air system operations id desired. When the AIR system is active, then Air pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR combination valves replace the conventional check valves. When the AIR system is inactive the shut off valves prevent air flow in either direction.

OBDII Code P0491 Dodge - Secondary Air Injection System Insufficient Flow Bank 1 - AutoCodes.com — P0491 Dodge Code - Secondary Air Injection System Insufficient Flow Bank 1

What does this mean?

What are the Possible Causes of the DTC P0491 Dodge?

Intake leak
Damaged AIR system components
Faulty AIR Solenoid Valve
Faulty AIR system relay

How to Fix the DTC P0491 Dodge?

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 P0491 Dodge 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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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 P0491 Dodge Code

1. What are the common symptoms of OBDII code P0491 in a Dodge, indicating Secondary Air Injection System Insufficient Flow Bank 1?

- Common symptoms include the illumination of the Check Engine Light, rough idling, and decreased fuel efficiency.

2. What are the possible causes of OBDII code P0491 indicating Secondary Air Injection System Insufficient Flow Bank 1 in a Dodge?

- Possible causes include a faulty secondary air injection pump, damaged air injection hoses, clogged air filter, or a malfunctioning air injection system valve.

3. How can I diagnose the issue related to OBDII code P0491 in my Dodge's Secondary Air Injection System?

- Diagnose the issue by checking the secondary air injection components for any visible damage, inspecting the air injection hoses for blockages, and testing the functionality of the air injection pump.

4. Can driving with OBDII code P0491 in a Dodge lead to further damage?

- Driving with this code may not cause immediate harm to the vehicle, but it can result in reduced engine performance and increased emissions. It is recommended to address the issue promptly.

5. What are some repair tips for resolving OBDII code P0491 in a Dodge related to Secondary Air Injection System Insufficient Flow Bank 1?

- Repair tips include replacing the faulty secondary air injection pump, clearing any blockages in the air injection system components, and ensuring proper connection of all hoses.

6. Is it possible to reset the Check Engine Light after fixing OBDII code P0491 in a Dodge?

- Yes, the Check Engine Light can be reset using an OBDII scanner after resolving the issue triggering code P0491 in the Dodge's Secondary Air Injection System.

7. How can I prevent OBDII code P0491 from recurring in my Dodge?

- Regular maintenance checks, timely replacement of air filter and hoses, and ensuring proper functioning of the secondary air injection system components can help prevent the recurrence of this code.

8. Will fixing OBDII code P0491 improve my Dodge's overall engine performance?

- Yes, resolving code P0491 related to Secondary Air Injection System Insufficient Flow Bank 1 can lead to improved engine performance, smoother idling, and better fuel efficiency.

9. Can a DIY enthusiast tackle the repair related to OBDII code P0491 in a Dodge?

- Depending on the skill level and familiarity with automotive repairs, some DIY enthusiasts may be able to address the issue themselves, especially if it involves tasks like replacing the air filter or checking for hose blockages.

10. How important is it to address OBDII code P0491 in a Dodge promptly?

- It is important to address code P0491 promptly to prevent potential damage to the engine, ensure optimal fuel efficiency, and reduce harmful emissions from the vehicle.