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AutoCodes – GMC – P0175 2016 GMC Sierra

P0175 2016 GMC Sierra Code - Fuel Trim System Rich Bank 2

Quick Answer

The Engine Control Module (ECM) controls a Closed Loop air/fuel metering system to provide the best possible combination of drivability, fuel economy, and emission control. Common causes include Dirty or Faulty Mass Air Flow (MAF) Sensor, Intake Air Leaks, Exhaust Gas 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
P0175 2016 GMC Sierra indicates Fuel Trim System Rich Bank 2.
Common causes
Common causes include Dirty or Faulty Mass Air Flow (MAF) Sensor, Intake Air Leaks, Exhaust Gas 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 255
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on May 29, 2022
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Code P0175 2016 GMC Sierra Description

The Engine Control Module (ECM) controls a Closed Loop air/fuel metering system to provide the best possible combination of drivability, fuel economy, and emission control. The ECM monitors the Heated Oxygen Sensor (HO2S) signal voltage and adjusts the fuel delivery based on the signal voltage while in Closed Loop. A change made to the fuel delivery changes the long and short-term fuel trim values. The short-term fuel trim values change rapidly in response to the HO2S signal voltages. These changes fine-tune the engine fueling. The long-term fuel trim values change in response to trends in the short-term fuel trim. The long-term fuel trim makes coarse adjustments to fueling to re-center and restore control to short-term fuel trim. The ideal fuel trim values are around 0 %. A positive fuel trim value indicates that the ECM is adding fuel to compensate for a lean condition. A negative fuel trim value indicates that the ECM is reducing the amount of fuel to compensate for a rich condition. The Diagnostic Trouble Code (DTC) will be set when the average long-term fuel trim weighted average value is greater or less than a calibrated value.
OBDII Code P0175 2016 GMC Sierra - Fuel Trim System Rich Bank 2 - AutoCodes.com
P0175 2016 GMC Sierra Code - Fuel Trim System Rich Bank 2
What does this mean?

What are the Possible Causes of the DTC P0175 2016 GMC Sierra?

  • Dirty or Faulty Mass Air Flow (MAF) Sensor
  • Intake Air Leaks
  • Exhaust Gas Leaks
  • Fuel Contamination
  • Faulty or Leaking Fuel Injectors
  • Faulty Front Heated Oxygen Sensor
  • Ignition Misfiring
  • Incorrect Fuel Pressure
  • Positive Crankcase Ventilation (PCV) Hose Leaks

How to Fix the DTC P0175 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 does this mean?

Code Tech Notes

The P0175 code means that more gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0175 is set in along with the P0172 code, it is highly likely that the problem is caused by leaking fuel injectors. If there are no leaking fuel injectors, the next step is to replace the air filter and clean the Mass Air Flow (MAF) Sensor. If the problem persists the MAF or Front Heated Oxygen (O2) Sensor will need to be replaced.

Click Here to Learn What is Bank 1 and Bank 2

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0175 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 P0175 2016 GMC Sierra code?

Need more information on how to fix the P0175 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0175 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 P0175 2016 GMC Sierra Code

1. What does the OBDII code P0175 mean on a 2016 GMC Sierra?

P0175 indicates that the fuel system is running too rich (too much fuel) on Bank 2, which refers to the side of the engine with cylinder 2.

2. What are common symptoms of P0175 on a 2016 GMC Sierra?

Symptoms may include reduced fuel efficiency, black smoke from the exhaust, rough idling, engine hesitation, or the check engine light turning on.

3. What causes the P0175 code on a 2016 GMC Sierra?

Common causes include a dirty or faulty mass airflow sensor, a leaking fuel injector, a clogged air filter, a failed oxygen sensor, or excessive fuel pressure.

4. Can a dirty air filter trigger P0175 on a 2016 GMC Sierra?

Yes, a clogged air filter can restrict airflow, causing the engine to run rich and triggering the P0175 code.

5. Is a faulty oxygen sensor a possible cause of P0175 on a 2016 GMC Sierra?

Yes, a damaged or failing oxygen sensor can provide incorrect data to the engine control module, leading to a rich fuel mixture.

6. How can I fix the P0175 code on a 2016 GMC Sierra?

Repairs may include cleaning or replacing the mass airflow sensor, replacing the oxygen sensor, inspecting and replacing a leaking fuel injector, or cleaning the air filter.

7. Can bad fuel pressure cause P0175 on a 2016 GMC Sierra?

Yes, excessive fuel pressure can cause the engine to run rich and trigger the P0175 code.

8. Is it safe to drive a 2016 GMC Sierra with the P0175 code?

While the truck may still run, driving with a P0175 code can lead to reduced fuel efficiency and potential damage to the catalytic converter over time.

9. How is P0175 diagnosed on a 2016 GMC Sierra?

A mechanic will use an OBDII scanner to verify the code, check fuel trims, inspect sensors, and look for fuel system issues such as leaks or clogs.

10. Can a bad mass airflow sensor cause P0175 on a 2016 GMC Sierra?

Yes, a malfunctioning mass airflow sensor can provide inaccurate readings, leading to a rich fuel mixture and the P0175 code.

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