AutoCodes – Chevrolet – P1048 2016 Chevrolet Silverado

P1048 2016 Chevrolet Silverado Code - Reductant Injector High Control Circuit Low 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: P1048 2016 Chevrolet Silverado indicates Reductant Injector High Control Circuit Low 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 342

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 P1048 2016 Chevrolet Silverado 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 ground in the high control circuit.

OBDII Code P1048 2016 Chevrolet Silverado - Reductant Injector High Control Circuit Low Voltage - AutoCodes.com — P1048 2016 Chevrolet Silverado Code - Reductant Injector High Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1048 2016 Chevrolet Silverado?

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 P1048 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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1048 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 P1048 2016 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.

Frequently Asked Questions about P1048 2016 Chevrolet Silverado Code

What does the OBDII code P1048 mean for a 2016 Chevrolet Silverado?

P1048 indicates a problem with the Reductant Injector High Control Circuit experiencing low voltage, which is part of the diesel exhaust fluid (DEF) system.

What are the common symptoms of code P1048 in a 2016 Chevrolet Silverado?

Symptoms may include the check engine light turning on, poor fuel efficiency, reduced engine performance, or issues with the DEF system.

What causes the P1048 code to appear?

Common causes include a faulty reductant injector, damaged wiring or connectors in the control circuit, a malfunctioning reductant control module, or a blown fuse.

Can I drive my 2016 Chevrolet Silverado with the P1048 code?

Driving with this code is not recommended, as it can lead to increased emissions and may cause further damage to the DEF system or related components.

How do I diagnose the P1048 code?

Start by checking the wiring and connectors for the reductant injector, testing the voltage in the circuit, inspecting the reductant injector for damage, and using a scan tool to monitor DEF system performance.

How can I fix the P1048 code on my Silverado?

Repairs may include replacing the reductant injector, repairing or replacing damaged wiring, replacing a blown fuse, or reprogramming the control module if necessary.

What tools do I need to address the P1048 code?

You may need a multimeter to check voltage, a scan tool for diagnostics, and basic tools to inspect and replace components like the reductant injector.

Is the P1048 code covered under warranty for a 2016 Chevrolet Silverado?

It depends on your warranty coverage, but emissions-related components may still be covered under federally mandated emissions warranties. Check with your dealership.

How much does it cost to fix the P1048 code?

Costs vary depending on the problem, but typical repairs like replacing a reductant injector can range from $200 to $500, excluding labor.

Can a software update resolve the P1048 code?

In some cases, a software update or reprogramming of the reductant control module can resolve the issue, but only after confirming no physical damage to components.