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AutoCodes – GMC – P026C 2016 GMC Sierra

P026C 2016 GMC Sierra Code - Injection Quantity Too Low

Quick Answer

In the calibration/controls community this diagnostic is referred to as the Fuel Setpoint Adaptation (FSA). Common causes include Dirty Air Filter, Air Restrictions, Air Leaks. 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
P026C 2016 GMC Sierra indicates Injection Quantity Too Low.
Common causes
Common causes include Dirty Air Filter, Air Restrictions, Air Leaks.
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 196
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Jun 02, 2022
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Code P026C 2016 GMC Sierra Description

In the calibration/controls community this diagnostic is referred to as the Fuel Setpoint Adaptation (FSA). This algorithm is used to estimate the actual injected fuel quantity. This estimated quantity is used to correct Engine Control Module (ECM) set points for items such as Exhaust Gas Recirculation (EGR), Boost Pressure, Fuel Rail Pressure, etc.. The goal of FSA is to account for injectors that drift during the lifetime of the vehicle. The algorithm estimates the real injected fuel quantity by using input from the Mass Air Flow (MAF) sensor & Nitrogen Oxides (NOx) sensor 1 to determine the air/fuel ratio. If airflow parameters are incorrect due to leaks, blockages, malfunctioning EGR, inaccurate MAF sensor/NOx sensor 1 signals, or fuel injectors that are not performing as intended, a skewed air-fuel ratio could negatively affect the FSA and lead to DTC P026C or P026D. The Diagnostic Trouble Code (DTC) will be set if the Fuel Injection Quantity is less than a predefined threshold for greater than 10 s
OBDII Code P026C 2016 GMC Sierra - Injection Quantity Too Low - AutoCodes.com
P026C 2016 GMC Sierra Code - Injection Quantity Too Low
What does this mean?

What are the Possible Causes of the DTC P026C 2016 GMC Sierra?

  • Dirty Air Filter
  • Air Restrictions
  • Air Leaks
  • Faulty Fuel Injector
  • Faulty Nitrogen Oxides (NOx) Sensor
  • Faulty Mass Air Flow (MAF) Sensor

How to Fix the DTC P026C 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 P026C 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 P026C 2016 GMC Sierra code?

Need more information on how to fix the P026C 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P026C 2016 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 P026C 2016 GMC Sierra Code

1. What does the OBDII code P026C mean on a 2016 GMC Sierra?

P026C indicates "Injection Quantity Too Low," meaning the engine control module (ECM) has detected insufficient fuel being delivered to the engine.

2. What are the common symptoms of code P026C in a 2016 GMC Sierra?

Symptoms may include reduced engine performance, poor fuel economy, rough idling, hard starting, or the check engine light turning on.

3. What causes the P026C code on a 2016 GMC Sierra?

Common causes include clogged fuel injectors, a failing fuel pump, a faulty fuel pressure regulator, or issues with the fuel rail pressure sensor.

4. Can a dirty fuel filter trigger the P026C code?

Yes, a clogged or dirty fuel filter can restrict fuel flow, potentially causing the "Injection Quantity Too Low" condition.

5. How can I diagnose the P026C code on my 2016 GMC Sierra?

Use an OBDII scanner to confirm the code, then check the fuel injectors, fuel pump, fuel pressure sensor, and related components for damage, clogs, or malfunctions.

6. Is it safe to drive my 2016 GMC Sierra with the P026C code active?

Driving with this code is not recommended, as insufficient fuel delivery can cause engine misfires, reduced power, and potential engine damage over time.

7. How do I fix the P026C code on my 2016 GMC Sierra?

Repairs may include cleaning or replacing fuel injectors, replacing the fuel filter, repairing the fuel pump, or replacing the fuel pressure sensor if faulty.

8. Can low-quality fuel cause the P026C code?

Yes, contaminated or low-quality fuel can clog injectors or damage fuel system components, leading to insufficient fuel delivery.

9. How much does it cost to fix the P026C code on a 2016 GMC Sierra?

The cost depends on the cause, ranging from $50 for a fuel filter replacement to over $1,000 for a fuel pump or injector replacement.

10. Can a software update fix the P026C code on a 2016 GMC Sierra?

In some cases, a software update for the ECM may address calibration issues causing the code, but this depends on the specific circumstances.

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