AutoCodes – Chevrolet – P2049 Chevrolet

P2049 Chevrolet Code - Reductant Injector Control Circuit High Voltage

Quick Answer

The Reductant Injector is a component of selective catalytic reduction system used to dose the reductant fluid to the exhaust gas and participate in the reduction reactions. Common causes include Faulty Reductant Injector, Reductant Injector harness is open or shorted, Reductant Injector circuit poor electrical connection. 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: P2049 Chevrolet indicates Reductant Injector Control Circuit High Voltage.
Common causes: Common causes include Faulty Reductant Injector, Reductant Injector harness is open or shorted, Reductant Injector circuit poor electrical connection.
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 615

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 Oct 01, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P2049 Chevrolet Description

The Reductant Injector is a component of selective catalytic reduction system used to dose the reductant fluid to the exhaust gas and participate in the reduction reactions. The Engine Control Module (ECM) calculates the injection time of the reductant injector based on the measurement of the NOx sensors. To activate the injector the ECM supplies a PWM signal to the high control circuit and the low control circuit is always commanded ON. The Diagnostic Trouble Code (DTC) will be set when the Reductant Control Module detects a short to voltage in the low control circuit.

OBDII Code P2049 Chevrolet - Reductant Injector Control Circuit High Voltage - AutoCodes.com — P2049 Chevrolet Code - Reductant Injector Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2049 Chevrolet?

Faulty Reductant Injector
Reductant Injector harness is open or shorted
Reductant Injector circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2049 Chevrolet?

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 does this mean?

Code Tech Notes

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2049 Chevrolet 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 P2049 Chevrolet code?

Need more information on how to fix the P2049 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2049 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P2049 2014 Chevrolet Silverado — Reductant Injector Control Circuit High Voltage
P2049 2015 Chevrolet Silverado — Reductant Injector Control Circuit High Voltage
P2049 2016 Chevrolet Silverado — Reductant Injector Control Circuit High Voltage
P2049 2017 Chevrolet Silverado — Reductant Injector Control Circuit High Voltage
P2049 2018 Chevrolet Silverado — Reductant Injector Control Circuit High Voltage

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 P2049 Chevrolet Code

What does the OBDII code P2049 mean for a Chevrolet vehicle?

The OBDII code P2049 indicates a problem with the reductant injector control circuit, specifically that there is high voltage detected in the circuit.

What symptoms might I experience if my vehicle has the P2049 code?

Common symptoms include reduced engine power, the check engine light illuminating, and possible difficulty starting the vehicle.

What could cause the P2049 code to trigger?

Causes can include a faulty reductant injector, damaged wiring or connectors in the control circuit, or issues with the engine control module (ECM).

Can I drive my Chevrolet with the P2049 code?

While you can drive the vehicle, it is not recommended as it may lead to reduced performance, increased emissions, and potential further damage.

How can I diagnose the P2049 code?

You can start by using an OBDII scanner to confirm the code, then visually inspect the wiring and connectors for damage, and test the reductant injector for proper operation.

What are some common repair solutions for the P2049 code?

Repairs may include replacing the faulty reductant injector, repairing or replacing damaged wiring or connectors, or reprogramming/updating the ECM.

Is the P2049 code specific to Chevrolet vehicles?

No, while the code may appear more frequently in Chevrolet vehicles, it is a universal OBDII code and can occur in other makes and models as well.

Will clearing the P2049 code fix the issue?

Clearing the code may temporarily turn off the check engine light, but it will not resolve the underlying problem, and the code is likely to return if the issue is not fixed.

How can I prevent the P2049 code from occurring?

Regular maintenance, including checking the reductant system and electrical connections, can help prevent issues that lead to the P2049 code.