p0175 Chevy Silverado

p0175 Chevy Silverado: System Too Rich Bank 2 (Meaning, Fix)

Recently a friend called me asking for a solution to the p0175 Chevy Silverado error code. I suggested some fixes to him and he was able to solve it by himself.

So I decided to write this article and share with you everything about the p0175 Chevy Silverado error code. I explain its meaning, causes, symptoms, diagnosis, and fixes.

What does p0175 Chevy Silverado Mean?

p0175 Chevy Silverado

A P0175 Chevy Silverado sets in when an excessive amount of fuel and a low amount of oxygen in the A:F (air-fuel) ratio is detected by the Engine Control Module (ECM). The standard air-fuel ratio of the engine is 14.7:1.

The P0175 code manifests when the Engine Control Module (ECM) fails to make up for the quantity of air or fuel needed to return the A:F ratio back to its originally set values.

You may also like this guide on how to solve Chevy Starter Engagement Problems.

P0175 System Too Rich Bank 2: Everything You Need to Know

Chevy Silverado p0175 System Too Rich Bank 2 occurs when there is an excess amount of fuel and a low amount of oxygen in bank 2 of the engine.

Issue Severity

A P0175 Chevy Silverado can compel the catalytic converter to release more pollutants. This shortens the lifespan of the converter.

The P0175 code in the Chevy Silverado also creates a greater workload for the engine. Thereby causing internal damage to the engine and reducing its lifespan.

Repair Urgency

The P0175 Chevy Silverado can cause serious damage to the catalytic converter, plugs, pistons, and spark. To avoid such damages, the P0175 Chevy Silverado should be fixed promptly.


As the P0175 Chevy Silverado can be caused by a variety of factors, all necessary diagnosis methods listed in this article should be carried out while diagnosing the P0175 Chevy Silverado. This is necessary for identifying the particular cause(s) of the problem.

What can Cause a P0175 Code in a Chevy Silverado?

These are the things that can cause a P0175 Code in a Chevy Silverado:

  1. Leaking or clogging of the fuel injector.
  2. Faulty condition of the fuel regulator.
  3. Faultiness or dirtiness of the mass air flow sensor.
  4. A damaged or dirty oxygen sensor.
  5. Leakage of the vacuum (PCV hoses, vacuum hoses, intake manifold gasket).
  6. The ECM requires a reprogram.
  7. A fault with the fuel delivery function.
  8. The defection of the coolant temperature sensor.
  9. Malfunction of the thermostat.
  10. A defective air-fuel ratio sensor
  11. An incorrect fuel pressure.
  12. An exhaust leak.

You can find the chevy 350 sensor locations in my detailed article.

p0175 Chevy Silverado Symptoms

These are the common p0175 Chevy Silverado symptoms:

  1. Illumination of the check engine light.
  2. Release of a strong odor from the exhaust.
  3. A heap of dust or soot on the diodes of the spark plugs.
  4. A rise in the fuel consumption/combustion rate of the engine.
  5. Misfiring of the engine.
  6. Inadequate production of power from the engine.

How Do I Fix the code p0175 on my Chevy Silverado?

Once you have carried out all the diagnosis processes and have identified the particular cause(s) of the P0175 Chevy Silverado problem, the following repairs can be used to fix the code p0175 on Chevy Silverado:

  1. Reprogram the Engine Control Module.
  2. The fuel pump should be replaced.
  3. Change the coolant temperature sensor, if faulty.
  4. Replace the thermostat, if broken.
  5. The defective fuel injector should be replaced.
  6. Substitute the faulty fuel filter with a new/good one.
  7. The mass air-flow sensor should be changed or cleaned.
  8. Change the cracked or damaged vacuum lines.
  9. The oxygen sensors should be changed or cleaned.
  10. Change the faulty fuel line with a properly functioning one.

How Much Does It Cost to Fix p0175 Chevy Silverado?

These are estimated costs to Fix p0175 Chevy Silverado:

  • Vacuum leak- $100-$200.
  • Air-fuel sensor/ Oxygen sensor- $200-$300.
  • Repairing the exhaust- $100-$200.
  • Fuel pressure regulator- $200-$400.
  • Fuel pump- $1300-$1700.
  • Cleaning the mass air flow sensor- $100.
  • Replacing the mass air flow sensor- $300.

These estimated costs for each P0175 Chevy Silverado fix listed above will vary based on your location and car model.

They include the costs of the suitable parts and the labor required.

DIY Steps to Diagnose p0175 Chevy Silverado

DIY Steps to Diagnose p0175 Chevy Silverado

Step 1: Scan the Vehicle with The Fixd Sensor

The Fixd sensor (used to read trouble codes from cars), should be used to conduct a scan of the vehicle. This is necessary to ensure that the only code present is P0175. Any other code(s) identified during the scan should be resolved first.

Step 2: Inspect the Vacuum Lines and Hoses for Any Leakages

All vacuum lines and hoses should be inspected for any leakages, and to ensure that they are connected accurately. A leak can easily be identified by the production of a hissing sound.

Step 3: Remove and Clean the Mass Air Flow Sensor

The mass air flow sensor (MAF) should be removed and cleaned. A mass air flow cleaner/contact cleaner should be used in cleaning the mass air flow sensor.

Step 4: Inspect the Exhaust System for Any Leakages

Inspect the state of the intake exhaust system to detect any leakage issues. A leakage in the exhaust can be identified by the accumulation of soot in the region of the leakage occurrence.

Step 5: Check the Level of The Fuel Pressure

Check the level of the fuel pressure; ensure that the fuel injectors are working properly. Engine misfires are usually associated with faulty fuel injectors. Also, check if there is damage to the wiring of the fuel injector, and make sure that its wiring is properly connected.

Step 6: Replace the Air-Fuel Ratio Sensors And/or the Oxygen Sensors

If the P0175 code still exists after performing the above diagnosis steps, replace the air-fuel ratio sensors, and/or the oxygen sensors.

Step 7: Inspect the Spark Plugs

Inspect the spark plugs for any build-up of soot at the diodes. If there is an appearance of soot, promptly replace all the spark plugs.

Common p0175 Chevy Silverado Diagnosis Mistakes

The major mistake people make while diagnosing P0175 Chevy Silverado is concluding that a part or component is faulty without conducting a proper and complete diagnosis.

This mistake makes them carry out repairs with an inaccurate diagnosis. Thereby leading to a P0175 Chevy Silverado repair failure.


You need to note that P0175 Chevy Silverado diagnosis and fixes usually require technical knowledge from the fixer. So, if you are a newbie, this issue will be handled better if fixed by a professional.

However, if your experience level is intermediate, the steps in this article should be of great help to you. I hope that with the help of this article, you will be able to fix the P0175 code on your Chevy Silverado.

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