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P0422 2016 Chevrolet Silverado Code - Catalyst 2 Low Efficiency

Quick Answer

The main function of the Diesel Oxidation Catalyst (DOC) is to control emissions of non-methane hydrocarbons and Carbon Monoxide (CO). Common causes include Faulty Oxidation Catalytic Converter, Faulty Diesel Particulate Filter (DPF). 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
P0422 2016 Chevrolet Silverado indicates Catalyst 2 Low Efficiency.
Common causes
Common causes include Faulty Oxidation Catalytic Converter, Faulty Diesel Particulate Filter (DPF).
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 293
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Sep 23, 2022
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Code P0422 2016 Chevrolet Silverado Description

The main function of the Diesel Oxidation Catalyst (DOC) is to control emissions of non-methane hydrocarbons and Carbon Monoxide (CO). Its secondary function is to assist with the Diesel Particulate Filter (DPF) regeneration, by obtaining and sustaining the temperature necessary for regeneration. In order to generate the high exhaust temperatures needed for regeneration, the aftertreatment system increases exhaust temperatures by injecting diesel fuel into the exhaust system via post-injection. The injected fuel is converted into heat by the DOC to incinerate soot accumulated in the DPF. The Engine Control Module (ECM) monitors the exhaust gas temperature sensor 3, 4, and 5 to determine if the operating temperature of the catalyst is achieved during a DPF regeneration.
OBDII Code P0422 2016 Chevrolet Silverado - Catalyst 2 Low Efficiency - AutoCodes.com
P0422 2016 Chevrolet Silverado Code - Catalyst 2 Low Efficiency
What does this mean?

What are the Possible Causes of the DTC P0422 2016 Chevrolet Silverado?

  • Faulty Oxidation Catalytic Converter
  • Faulty Diesel Particulate Filter (DPF)

How to Fix the DTC P0422 2016 Chevrolet Silverado?

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 P0422 2016 Chevrolet Silverado 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.

Need more information about the P0422 2016 Chevrolet Silverado code?

Need more information on how to fix the P0422 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0422 2016 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 P0422 2016 Chevrolet Silverado Code

1. What does the OBDII code P0422 mean for a 2016 Chevrolet Silverado?

P0422 indicates that the secondary catalytic converter is not operating efficiently, as detected by the oxygen sensors.

2. What are the symptoms of code P0422 in a 2016 Chevrolet Silverado?

Common symptoms include the check engine light turning on, reduced fuel efficiency, and possible loss of engine power.

3. What causes code P0422 on a 2016 Chevrolet Silverado?

Causes may include a failing catalytic converter, damaged oxygen sensors, exhaust leaks, or contamination from oil or coolant.

4. Can I drive my 2016 Chevrolet Silverado with a P0422 code?

While the vehicle may still run, driving for extended periods with this code can worsen emissions and potentially damage other components.

5. How do I fix code P0422 on a 2016 Chevrolet Silverado?

Repairs may involve replacing the catalytic converter, checking and replacing faulty oxygen sensors, fixing exhaust leaks, or addressing engine misfires.

6. How much does it cost to repair a P0422 code on a 2016 Chevrolet Silverado?

Repair costs can vary widely, ranging from $150 for oxygen sensor replacement to over $1,000 for a new catalytic converter.

7. How can I prevent code P0422 in the future?

Regular maintenance, addressing misfires promptly, and avoiding oil or coolant leaks can help prevent catalytic converter inefficiency.

8. Can a bad catalytic converter cause other issues in my 2016 Chevrolet Silverado?

Yes, a failing catalytic converter can lead to increased emissions, reduced performance, and potential damage to nearby exhaust components.

9. Will clearing the P0422 code fix the problem on a 2016 Chevrolet Silverado?

Clearing the code without addressing the underlying issue will only temporarily remove the warning; the problem will likely return.

10. How do oxygen sensors relate to the P0422 code on a 2016 Chevrolet Silverado?

Oxygen sensors monitor the efficiency of the catalytic converter, and incorrect readings can trigger the P0422 code.

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