AutoCodes – GMC – P2148 2016 GMC Sierra

P2148 2016 GMC Sierra Code - Cylinder 1 Injector High Control Circuit High Voltage

Quick Answer

The Engine Control Module (ECM) supplies voltage to each fuel injector on the high control circuits. Common causes include Faulty Fuel Injector 1, Fuel Injector 1 harness is open or shorted, Fuel Injector 1 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: P2148 2016 GMC Sierra indicates Cylinder 1 Injector High Control Circuit High Voltage.
Common causes: Common causes include Faulty Fuel Injector 1, Fuel Injector 1 harness is open or shorted, Fuel Injector 1 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 153

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 08, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2148 2016 GMC Sierra Description

The Engine Control Module (ECM) supplies voltage to each fuel injector on the high control circuits. The ECM energizes each fuel injector by grounding the low control circuit of the fuel injector. The ECM monitors the status of the fuel injector circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injector(s) is disabled. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the fuel injector high voltage supply circuit is shorted to voltage for greater than 2 s.

OBDII Code P2148 2016 GMC Sierra - Cylinder 1 Injector High Control Circuit High Voltage - AutoCodes.com — P2148 2016 GMC Sierra Code - Cylinder 1 Injector High Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2148 2016 GMC Sierra?

Faulty Fuel Injector 1
Fuel Injector 1 harness is open or shorted
Fuel Injector 1 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2148 2016 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2148 2016 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.

Need more information about the P2148 2016 GMC Sierra code?

Need more information on how to fix the P2148 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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 P2148 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P2148 in a 2016 GMC Sierra?

- Common symptoms include rough idling, engine misfires, decreased fuel efficiency, and potentially a Check Engine light.

2. What causes the OBDII code P2148 to trigger in a 2016 GMC Sierra?

- The code P2148 is usually triggered by a high voltage condition in the control circuit of the fuel injector for cylinder 1.

3. How can I diagnose the issue related to OBDII code P2148 in my 2016 GMC Sierra?

- Diagnosis typically involves checking the wiring harness, connectors, and the fuel injector itself for any damage or loose connections.

4. Can a faulty fuel injector cause the OBDII code P2148 in a 2016 GMC Sierra?

- Yes, a faulty fuel injector for cylinder 1 can cause the high voltage condition that triggers the P2148 code.

5. Is it safe to continue driving my 2016 GMC Sierra with OBDII code P2148 present?

- It is not recommended to drive the vehicle with the P2148 code present, as it can lead to further engine damage and potential safety issues.

6. How can I repair the Cylinder 1 Injector High Control Circuit High Voltage issue in my 2016 GMC Sierra?

- Repair typically involves repairing or replacing the wiring harness, connectors, or the fuel injector for cylinder 1 as needed.

7. Will resetting the OBDII code P2148 in my 2016 GMC Sierra make it go away permanently?

- Resetting the code may clear the Check Engine light temporarily, but if the underlying issue is not addressed, the code is likely to reappear.

8. Can a DIY enthusiast fix the OBDII code P2148 in a 2016 GMC Sierra?

- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair the issue causing the P2148 code.

9. How much does it typically cost to repair the OBDII code P2148 in a 2016 GMC Sierra at a professional auto repair shop?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

10. Are there any preventive maintenance tips to avoid the Cylinder 1 Injector High Control Circuit High Voltage issue in a 2016 GMC Sierra?

- Regularly maintaining the fuel system, including using high-quality fuel and following the manufacturer's recommended service schedule, can help prevent issues like the P2148 code from occurring.