AutoCodes – Chevrolet – P0422 2014 Chevrolet Silverado

P0422 2014 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 Filterâ€‰(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 2014 Chevrolet Silverado indicates Catalyst 2 Low Efficiency.
Common causes: Common causes include Faulty Oxidation Catalytic Converter, Faulty Diesel Particulate Filterâ€‰(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 392

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Sep 23, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0422 2014 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 2014 Chevrolet Silverado - Catalyst 2 Low Efficiency - AutoCodes.com — P0422 2014 Chevrolet Silverado Code - Catalyst 2 Low Efficiency

What does this mean?

What are the Possible Causes of the DTC P0422 2014 Chevrolet Silverado?

Faulty Oxidation Catalytic Converter
Faulty Diesel Particulate Filterâ€‰(DPF)

How to Fix the DTC P0422 2014 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 2014 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 2014 Chevrolet Silverado code?

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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.