AutoCodes – GMC – P1048 2014 GMC Sierra

P1048 2014 GMC Sierra 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 2014 GMC Sierra 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 328

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 2014 GMC Sierra 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 2014 GMC Sierra - Reductant Injector High Control Circuit Low Voltage - AutoCodes.com — P1048 2014 GMC Sierra Code - Reductant Injector High Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1048 2014 GMC Sierra?

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 2014 GMC Sierra?

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 2014 GMC Sierra 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 P1048 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P1048 in a 2014 GMC Sierra?

- Common symptoms include reduced engine performance, rough idling, and the illumination of the check engine light.

2. What does the OBDII code P1048 "Reductant Injector High Control Circuit Low Voltage" indicate in a 2014 GMC Sierra?

- This code indicates a problem with the reductant injector high control circuit having low voltage, affecting the vehicle's emissions control system.

3. What are the possible causes of OBDII code P1048 in a 2014 GMC Sierra?

- Possible causes include a faulty reductant injector, damaged wiring or connectors in the control circuit, issues with the engine control module, or a low voltage condition in the system.

4. How can I diagnose the cause of OBDII code P1048 in my 2014 GMC Sierra?

- Proper diagnosis involves checking the reductant injector, inspecting wiring and connectors for damage, testing the voltage in the control circuit, and scanning the engine control module for related faults.

5. Can I continue driving my 2014 GMC Sierra with OBDII code P1048 active?

- It is not recommended to continue driving with this code active, as it can lead to increased emissions, reduced fuel efficiency, and potential damage to the emissions control system.

6. How can I repair OBDII code P1048 in my 2014 GMC Sierra?

- Repair options may include replacing the faulty reductant injector, repairing damaged wiring or connectors, resetting the engine control module, and clearing the trouble code.

7. Is it possible to reset OBDII code P1048 in a 2014 GMC Sierra without fixing the underlying issue?

- While you can clear the trouble code using an OBDII scanner, the code is likely to return if the root cause of the problem is not addressed.

8. Are there any DIY tips for addressing OBDII code P1048 in a 2014 GMC Sierra?

- DIY tips may include visually inspecting wiring and connectors, checking the reductant injector for visible damage, and ensuring proper connections in the control circuit.

9. Can a mechanic help me fix OBDII code P1048 in my 2014 GMC Sierra?

- Yes, a qualified mechanic can diagnose and repair the issue causing OBDII code P1048 in your 2014 GMC Sierra to ensure proper functioning of the emissions control system.

10. How much can I expect to pay to repair OBDII code P1048 in a 2014 GMC Sierra?

- The cost of repair can vary depending on the root cause of the issue, but it may involve parts replacement, labor costs, and diagnostic fees, with an estimated range typically between $100 to $500.