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P1048 2016 GMC Sierra Code - Reductant Injector High Control Circuit Low Voltage

Quick Answer

The P1048 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the reductant injector high control circuit having low voltage. Common causes include Faulty Reductant Injector: The reductant injector itself may be faulty and not receiving the proper voltage, Wiring Issues: Damage or corrosion to the wiring harness connected to the reductant injector can cause low voltage issues, Faulty Control Module: The control module responsible for regulating the reductant injector may be malfunctioning. 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 GMC Sierra indicates Reductant Injector High Control Circuit Low Voltage.
Common causes
Common causes include Faulty Reductant Injector: The reductant injector itself may be faulty and not receiving the proper voltage, Wiring Issues: Damage or corrosion to the wiring harness connected to the reductant injector can cause low voltage issues, Faulty Control Module: The control module responsible for regulating the reductant injector may be malfunctioning.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code P1048 2016 GMC Sierra Description

The P1048 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the reductant injector high control circuit having low voltage. In vehicles equipped with selective catalytic reduction (SCR) systems, the reductant injector is responsible for injecting a urea-based solution (DEF - Diesel Exhaust Fluid) into the exhaust stream to reduce harmful emissions. The reductant injector high control circuit low voltage code suggests that there is an issue with the electrical circuit that controls the reductant injector, leading to insufficient voltage being supplied to the injector.

OBDII Code P1048 2016 GMC Sierra - Reductant Injector High Control Circuit Low Voltage
P1048 2016 GMC Sierra Code - Reductant Injector High Control Circuit Low Voltage

Common Causes of P1048 2016 GMC Sierra

  1. Faulty Reductant Injector: The reductant injector itself may be faulty and not receiving the proper voltage.
  2. Wiring Issues: Damage or corrosion to the wiring harness connected to the reductant injector can cause low voltage issues.
  3. Faulty Control Module: The control module responsible for regulating the reductant injector may be malfunctioning.
  4. Poor Electrical Connection: Loose or poor electrical connections can result in low voltage reaching the reductant injector.

Symptoms of P1048 2016 GMC Sierra

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Engine Performance: The vehicle may experience a decrease in engine performance, including reduced power and acceleration.
  3. Poor Fuel Economy: A malfunctioning reductant injector can lead to poor fuel economy due to inefficient emissions control.
  4. Rough Idle: The engine may idle roughly or inconsistently due to the improper functioning of the reductant injector.

How to Fix P1048 2016 GMC Sierra

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble code and perform further testing to pinpoint the exact cause of the low voltage issue.
  2. Inspect Wiring and Connections: Check the wiring harness and electrical connections for any damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test Reductant Injector: Test the reductant injector to ensure it is functioning properly. Replace if found to be faulty.
  4. Check Control Module: Test the control module that regulates the reductant injector to determine if it is the source of the low voltage problem. Replace if needed.
  5. Clear Codes and Test Drive: After completing the repairs, clear the DTCs from the vehicle's computer and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1048 2016 GMC Sierra

The cost of repairing a reductant injector high control circuit low voltage issue can vary depending on the specific cause of the problem and the extent of the repairs needed. In general, the cost of parts for this repair can range from $200 to $500, with labor costs adding an additional $100 to $300. Overall, the total repair cost for this issue may fall between $300 and $800. It's important to note that labor rates at auto repair shops can vary, so it's advisable to check with local shops for more accurate pricing information.

What does this mean?

Tech Notes for P1048 2016 GMC Sierra









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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 GMC Sierra Code

1. What does the OBDII code P1048 mean on a 2016 GMC Sierra?

P1048 indicates a problem with the reductant injector high control circuit, specifically low voltage detected in the circuit.

2. What are the common symptoms of P1048 in a 2016 GMC Sierra?

Symptoms include the check engine light turning on, reduced engine performance, possible Diesel Exhaust Fluid (DEF) system warnings, and higher emissions.

3. What causes the P1048 code in a GMC Sierra?

Common causes include damaged wiring or connectors in the reductant injector circuit, a faulty reductant injector, or issues with the vehicle’s control module.

4. Can I drive my 2016 GMC Sierra with code P1048?

Driving with P1048 can lead to increased emissions and potential DEF system malfunctions. It’s recommended to address the issue promptly to avoid further damage.

5. How do I diagnose the P1048 code in my GMC Sierra?

Diagnosis involves inspecting the wiring and connectors for damage, testing the reductant injector for proper operation, and checking the voltage and resistance in the control circuit.

6. How do I fix the P1048 code on a 2016 GMC Sierra?

Repairs may include replacing damaged wiring, fixing faulty connectors, replacing the reductant injector, or reprogramming the control module if necessary.

7. What tools are needed to diagnose P1048 on a GMC Sierra?

You’ll need an OBDII scanner, a multimeter for voltage testing, and potentially wiring diagrams specific to the reductant injector circuit.

8. How much does it cost to repair the P1048 code on a 2016 GMC Sierra?

Repair costs can vary but may range from $150 to $500 depending on whether the issue is with wiring, the injector, or the control module.

9. Can a faulty reductant injector cause code P1048?

Yes, a malfunctioning reductant injector can cause low voltage in the control circuit, triggering the P1048 code.

10. Is P1048 specific to diesel vehicles like the GMC Sierra?

Yes, P1048 is typically related to the Diesel Exhaust Fluid (DEF) system and is found in diesel-powered vehicles like the GMC Sierra.

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