P0174 code chevy silverado

Here are the freeze data points for the last time it threw a code: P0174 rpm 520 load: 17.6 air flow rate: 5.35 gr/sec map sensor: 41 kpa short term fuel trim: 1 0.0 long term fuel trim: 1 7.0 ... A forum community dedicated to Chevrolet Silverado and GMC Sierra pickup owners and enthusiasts. Come join the discussion about performance ...

General info - 2003 Silverado 5.3L, 150K miles, only modification is a K&N cold air intake. Apologize in advance for the length of this About a week ago when the weather got colder (for south Louisiana that is), my truck started running rough. Few days later the check engine light came on. Took it to AutoZone and got engine codes P0171 …Apr 1, 2019 ... This is a 2000 Chevy truck 5.3L. A good all around hooptie truck to make a video for a code like this. Disclaimer: Due to factors beyond the ...Feb 25, 2023 ... Comments4 ; p0171 and p0174. James Davis · 54K views ; Check Engine Light? System Too Lean - Code P0171 or P0174 on Your Car or Truck. 1A Auto: ...One of the most common trouble codes with the Chevy Traverse is P0174. It indicates that your Chevy Traverse is running lean on the bank two side of the engine. P0174 and P0171 (fuel trim lean bank one) are the most frequently seen air/fuel mixture-related codes. If they appear together, it reduces the list of potential causes (more on …How to fixes a Chevy Silverado 5.3L engine with a P0171 Code System Too Lean (Bank 1)Read here for more information: https://www.backyardmechanic.org/fixes-f...A failure counter increments if the stuck EGR valve condition is still present. This DTC sets when the counter reaches a predetermined value. This would cause the P0171 and P0174 to set. I have attached three documents that may help, View attachment P1404 EGR Valve Closed Pintle Position.docx View attachment Exhaust Gas Recirculation Service ...

I had posted on December the 1st in anothers post that I also got the P0171 and P0174 codes, both banks lean. ... Chevy Silverado EV Forum 2K+ members. Home.P0172 And P0175 Chevy Silverado Codes: Possible Reasons & Fixes. In short, P0172 refers to bank 1 having a rich fuel mixture to the engine. It’s the same for P0172 but for bank 2 instead. Both of these get triggered by the upstream oxygen sensor in your Chevy Silverado. A rich fuel mixture basically means that there’s either too much fuel ...Nov 12, 2012 · Failed or Faulty Oxygen Sensor (bank 1, sensor 1) Sticking/Plugged or Failed Fuel Injector. Low Fuel Pressure (possible plugged/dirty fuel filter!) Exhaust Leak between Engine and first Oxygen Sensor. Possible Solutions: A lot of Times, Cleaning the MAF Sensor and Finding/Fixing Vacuum Leaks fixes the Problem. I'm getting codes p0101, p0171, p0174 after driving it from clearing the codes out. The van had codes p0101, p0171, p0174, p013e, p014a, p0158, p20 ... I have lean codes on a 2001 chevy silverado motor is the 4.8 codes are p0174 and p0171. I've changed the valve by tank the valve on the top of the motor PVC valve plugs wires.General info - 2003 Silverado 5.3L, 150K miles, only modification is a K&N cold air intake. Apologize in advance for the length of this About a week ago when the weather got colder (for south Louisiana that is), my truck started running rough. Few days later the check engine light came on. Took it to AutoZone and got engine codes P0171 …Codes out p0101, p0154, p0171, p0174, p0300 idles rough when cold but not all the time. Does it more when temp drops or - Answered by a verified Chevy Mechanic. ... We have a chevy silverado with a 5.3 liter engine. It's an 03' The check engine light goes on in the morning when we are warming it up.

May 2, 2022 ... 1997 Chevrolet Suburban (Lean codes P0171/P0174) ... System Too Lean - Code P0171 or P0174 on Your Car or Truck ... P0171and P0174 CODES CHEVY VORTEC ...Feb 27, 2023 ... Check Engine Light? System Too Lean - Code P0171 or P0174 on Your Car or Truck. 1A Auto: Repair Tips & Secrets Only Mechanics Know•1.1M views.Are the P0171, P0174, and P0300 the only codes you have stored? Save Share. Like. P. PJesse Discussion starter 20 posts ... Chevy Silverado and GMC Sierra Forum.I have a 2004 Silverado Z71, 5.3 with 154K miles. Other than this problem the ruck runs great. I had the fuel lines and fuel pump replaced two months ago and after that, I started to get the P0171 and P0174 (bank 1 and 2 lean) and the long term fuel trims "LTFT" are 18-25% (both) There were no signs of issues cold or warm.Chevrolet Silverado 1500: I have lean codes on a 2001 chevy. I have lean codes on a 2001 chevy silverado motor is the 4.8 codes are p0174 and p0171. I've changed the valve by tank the valve on the top … read more. ZZDaryl. Lead Auto Tech.

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If anyone's ever corrected the P0171/P0174 codes, please speak up! ... Chevy Silverado and GMC Sierra Forum. 1.4M posts 182.9K members Since 2009 A forum community dedicated to Chevrolet Silverado and GMC Sierra pickup owners and enthusiasts. Come join the discussion about performance, modifications, classifieds, …13 posts · Joined 2017. #17 · Jan 2, 2018. I put in a new Delphi fuel pump and Maf sensor.The P0171 and P0174 codes went away.It could have been the Maf sensor or the crappy K&N intake might have been leaking.The fuel pressure is still low 50 with a new pump.I'm getting P0300 code at idle.When I hooked scanner up it's misfiring on …8 posts · Joined 2024. #1 · Mar 1, 2024. Hello, 2004, 2500HD, 6.0L, 4X4 with 131,000 miles all original no after market modes. I have P0171 and P0174 codes. My effort. New -. Fuel Tank Pressure Sensor, Gas Cap,Canister Purge Valve, Evap canister vent solenoid, fuel pump (55psi running), Mass flow sensor, air filter. Basically every item new ...The P0174 code means that more air than gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0174 is set in along with the …

Engine Code P0174: System Too Lean (Bank 2). The fuel system is running weak or a vacuum leak exists near the engine. Engine Code P0174 means that the …The 2015 Chevy Silverado 1500 is a dependable and powerful truck that can handle all your needs. Whether you’re hauling heavy loads, towing a trailer, or just running errands aroun...Engine Code P0174: System Too Lean (Bank 2). The fuel system is running weak or a vacuum leak exists near the engine. Engine Code P0174 means that the …P0171and p0174 code can be caused by : The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.The most common fix for P0420 in the Chevy Silverado is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Silverado into an exhaust shop for an (expensive) new catalytic converter, let’s ensure that’s what you need. Here’s a good P0420 diagnostic order for the Chevy Silverado: 1. Check for Other CodesDec 16, 2019 · P0443 indicates a problem with the wiring to/from the purge valve or that the purge valve solenoid has a short/open circuit. It typically won’t affect the way that your Silverado runs. You may smell gas. Most commonly caused by a bad purge valve solenoid. Checking the gas cap may just save a lot of time. Nov 12, 2012 · Failed or Faulty Oxygen Sensor (bank 1, sensor 1) Sticking/Plugged or Failed Fuel Injector. Low Fuel Pressure (possible plugged/dirty fuel filter!) Exhaust Leak between Engine and first Oxygen Sensor. Possible Solutions: A lot of Times, Cleaning the MAF Sensor and Finding/Fixing Vacuum Leaks fixes the Problem. The most common fix for P0420 in the Chevy Silverado is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Silverado into an exhaust shop for an (expensive) new catalytic converter, let’s ensure that’s what you need. Here’s a good P0420 diagnostic order for the Chevy Silverado: 1. Check for Other CodesJun 22, 2017 ... The first thing I would do is to unplug the MAF. If the MAF is contaminated it will cause lean codes and misfires. If it runs better unplugged ...A P1174 & P1175 trouble code means that your air to fuel ratio is either running too lean or too rich. Engines will have two banks. In traditional V-shaped engines, the 2-4 cylinders (depending on whether it is a V4 or V8, etc.) on the left side are considered “Bank 1” and the cylinder on the left are considered “Bank 2”.P0174 p0171 p0430 differential lean undesirable egr 03 silverado 5.3 p0174 *solved* Chevy silverado p0171 and p0174 trouble codes P0171and p0174 codes chevy vortec engine. P0171 p0174 p0430 chevyP0171 p0174 autozone diagnostic Maf p0171 silverado p0174 airflow senzor 4runner trouble codes presiune axleaddict simptome rol …

Aug 9, 2023 ... Causes of lean condition trouble codes P0171, P0174 - GM 5 3L ... P0496 check engine code on Chevy 2014 Traverse ... 09-19 Silverado/Sierra/Aval.

The P0174 code means that more air than gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0174 is set in along with the …The vehicle being worked on is a 2004 Chevy Suburban with a 5.3L engine. It had multiple trouble codes in memory P0171 and P0174 (fuel system too lean bank 1...A P1174 & P1175 trouble code means that your air to fuel ratio is either running too lean or too rich. Engines will have two banks. In traditional V-shaped engines, the 2-4 cylinders (depending on whether it is a V4 or V8, etc.) on the left side are considered “Bank 1” and the cylinder on the left are considered “Bank 2”.How To Fix – Chevy Silverado P0171 Trouble Code. By. John Huh - November 26, 2019. 1. SHARE. Facebook. Twitter. ... P0102 – Lean and/or Rich diagnostic trouble code; P0174 – Lean diagnostic trouble code; Possible Causes of P0171 Trouble Code. Air Intake Leak; Bad or lazy oxygen sensor;Only 33000 miles. A local GM service manager told me it was probably intake gaskets - I changed them to the FelPro metal gaskets - $70 - Code came back - Put a Solus scanner on it and drove it. Noticed Long term fuel trim was high on both banks meaning lean condition and when the control module cannot compensate high enough -bang - code sets.Feb 25, 2023 ... Comments4 ; p0171 and p0174. James Davis · 54K views ; Check Engine Light? System Too Lean - Code P0171 or P0174 on Your Car or Truck. 1A Auto: ...The great American sports car is going electric. GM shared the news this morning, and released the first images of the upcoming electric Chevrolet Corvette. The great American spor...P0174 Diagnosis. To diagnose P0174, a mechanic will typically use an OBD-II scanner or code reader to check for fault codes, and then perform a visual inspection of the engine, fuel system, air intake system, and exhaust system.The P0171 and P0174 are pointing to both banks running "lean". This means there is too much air or not enough fuel in the fuel/air mixture. When these codes are set together, there are a few different things that can cause this issue. First- a fuel pressure reading should be taken to ensure the fuel pump is working at normal capacity.Just got the following codes off my truck when the CEL came on: P0101, P0171, P0174, P0327 I pulled the intake all the way off including the manifold, gave it a good cleaning (including the MAF) and drove it around a bit only to have them come back. ... 2006 Chevrolet Silverado 1500HD 4x4 Metallic Silver, Duraline Bed liner, MT Tires …

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Getting codes P0171 and. 2001 Chev silverado 1500 4.8L. Getting codes P0171 and P0174,. Long term fuel trims pegged at 25%, short term 7%. Cleaned MAF, no change. Installed New O2 sensors and new MAF no change. Checked for open EGR. Now, if I unplug the MAF, the fuel trims go -3% ST and +3% LT. O2 sensors switching as they …p0171 and p0174. Guys, I need some help here. I have a 2004 Silverado, 2500HD 4wd. The knock sensors were bad so I replaced them. I got a new intake gasket when I put it back together and ever since I've been blowing these two codes. When I keep the engine under 2K RPMs it is fine, but under a load it loses power and starts to backfire.2012 6.0 vortec gas. p0174 right bank code. ... A forum community dedicated to Chevrolet Silverado and GMC Sierra pickup owners and enthusiasts. Come join the ...The 2015 Chevy Silverado 1500 is a reliable, powerful, and comfortable pickup truck that has been a top choice for drivers for years. The 2015 Chevy Silverado 1500 is powered by a ...I have a 2001 Z71 5.3 and I am getting a p0174 code which I know is lean bank 2. I had a new fuel filter left over from my brothers truck so I tried that out and it made no difference. ... A forum community dedicated to Chevrolet Silverado and GMC Sierra pickup owners and enthusiasts. Come join the discussion about performance, …Jun 14, 2011 ... ... P0174 codes Slight Rough Idle ... Causes and Fixes Chevrolet GMC P0174 Code: System Too Lean (Bank 2) ... 2007 Chevy Silverado 5.3L P0171 and P0174!P0174 code. I ran a P0174 code the other day while driving but the truck ran like normal, had no weird noises, or weird idle. I opened the hood and cleaned the MAF sensor and listened for vacuum leaks but couldn't find anything. I reset the truck but the codes came back after I drive for about an hour. Could use any help.Oct 11, 2021 · A sensor cluttered with dust or debris paints an inaccurate picture of the air flowing in, triggering the P0101 code. Cleaning it with a MAF sensor cleaner can sometimes do the trick. However, if cleaning doesn’t work or the sensor is damaged, it’s time for a replacement. 6 years 6 months ago - 6 years 6 months ago #13991. 2008 Chevy Silverado 2500hd 6.0 P0174 and a p0171 was created by drogan. 2008 Silverado 2500 6.0 has a p0171 and a p0174. Intake was smoked with no leaks truck came to me with 8 new injectors a new fuel pump new map and mass air flow sensor and new intake gaskets.Apr 25, 2020 ... ... Code troubleshooting for P0172 and P0175 Fuel Trim Rich, Specifically on a 2014 Chevy Silverado 5.3 Fuel Trim Rich Diagnosis. This applies ... ….

Diagnostic trouble code P0174 means system too lean bank 2. This means the powertrain control module (PCM) has detected lean conditions in bank 2 in the air-fuel ratio (AFR). Lean conditions mean there is too much air or too little fuel. Bank here means the location of the cylinder head in v-type engines. Check out this article, bank 1 and bank ...P0171 and p0174 2002 Chevy Silverado. Her lately my truck has been pull codes p0171 and p0174. Which is for a lean condition on bank 1 and 2. Their is no vacume leak, the valve gasket is good. I'm thinking it's the mass air flow or the O2 sensors.213 posts · Joined 2011. #2 · Oct 18, 2011. P1174 indicates fuel trim cylinder balance malfunction. This means that your cylinder-to-cylinder air to fuel ratio is not balanced properly. Usually caused by a faulty heated oxygen sensor located on the exhaust or a simple vacuum leak. It will not harm your vehicle but it will lower your fuel ...Oxygen Sensor – The P0175 code is thrown when the B2S1 O2 sensor does not register the right amount of oxygen in the exhaust. The computer will still adjust the air/fuel mixture to compensate. A bad O2 sensor will show a lean mixture more often, though. Mass Air Flow Sensor – Your Silverado’s mass air flow sensor calculates the volume of ...Chevrolet is an American icon, known for the Camaro, Corvette, Malibu, Impala and more. Take this quiz to see if you can recognize the most memorable '70s Chevys! Advertisement Adv...Aug 10, 2016 · Pulled codes and discovered the "lean codes" P0171 and P0174, There was also a transmission related code, which was not unexpected. Next steps: Removed the transmission and took it for bench rebuild, flushed cooling lines and installed the rebuilt transmission with new torque converter. Cleared codes and road tested. One of the most common trouble codes with the Chevy Tahoe is P0174. It indicates that your Chevy Tahoe is running lean on the bank two side of the engine. P0174 and P0171 (fuel trim lean bank one) are the most frequently seen air/fuel mixture-related codes. If they appear together, it reduces the list of potential causes (more on that in the ...Chevrolet Silverado 1500: I have lean codes on a 2001 chevy. I have lean codes on a 2001 chevy silverado motor is the 4.8 codes are p0174 and p0171. I've changed the valve by tank the valve on the top … read more. ZZDaryl. Lead Auto Tech.Feb 26, 2015 · The following diagnosis might be helpful if the vehicle exhibits the described symptoms. Condition/Concern: Check Engine Light with a P0300 due to 2 - 4 cylinders misfiring on the same bank of the engine. DTCs P0171, P0172, P0174 or P0175 may also set for the misfiring bank. The most common fix for P0420 in the Chevy Silverado is a new catalytic converter, followed by an O2 sensor replacement. Before taking your Silverado into an exhaust shop for an (expensive) new catalytic converter, let’s ensure that’s what you need. Here’s a good P0420 diagnostic order for the Chevy Silverado: 1. Check for Other Codes P0174 code chevy silverado, The following are the most common causes of the P0174 code. Faulty mass airflow (MAF) sensor. Blockage in the fuel filter and fuel injectors. The fuel pump is getting weak. Weakening fuel pressure regulator. The vacuum connector or PCV line may have cracks or damage. Defective oxygen sensor. Issues with PCM. , Getting codes P0171 and. 2001 Chev silverado 1500 4.8L. Getting codes P0171 and P0174,. Long term fuel trims pegged at 25%, short term 7%. Cleaned MAF, no change. Installed New O2 sensors and new MAF no change. Checked for open EGR. Now, if I unplug the MAF, the fuel trims go -3% ST and +3% LT. O2 sensors switching as they should., Jun 22, 2017 ... The first thing I would do is to unplug the MAF. If the MAF is contaminated it will cause lean codes and misfires. If it runs better unplugged ..., Jun 14, 2011 ... ... P0174 codes Slight Rough Idle ... Causes and Fixes Chevrolet GMC P0174 Code: System Too Lean (Bank 2) ... 2007 Chevy Silverado 5.3L P0171 and P0174!, I am getting intermittent P0171 and P0174 (O2 sensors) codes along with a very intermittent P0107, P0101, and P0300 (misfires on cylder 1 and 7 and random cylinder misfire). ... A forum community dedicated to Chevrolet Silverado and GMC Sierra pickup owners and enthusiasts. Come join the discussion about performance, modifications, …, P0172 And P0175 Chevy Silverado Codes: Possible Reasons & Fixes. In short, P0172 refers to bank 1 having a rich fuel mixture to the engine. It’s the same for P0172 but for bank 2 instead. Both of these get triggered by the upstream oxygen sensor in your Chevy Silverado. A rich fuel mixture basically means that there’s either too much fuel ..., Nov 22, 2014 · I have a new body style 2007 GMC sierra vortec max and recently have been getting P0171/P0174 lean conditions in bank 1 and bank 2 and I cant figure it out. SYMPTOMS: Check engine light. Stabilitrak/Traction control off/service randomly comes on, mostly at a stop or lower speeds. Stall/sputter @ idle, especially if started with the remote start ... , Car shoppers, take note: The Chevy Volt has received a $4,400 price cut amid low sales and a new model. By clicking "TRY IT", I agree to receive newsletters and promotions from Mon..., Nov 12, 2012 · Failed or Faulty Oxygen Sensor (bank 1, sensor 1) Sticking/Plugged or Failed Fuel Injector. Low Fuel Pressure (possible plugged/dirty fuel filter!) Exhaust Leak between Engine and first Oxygen Sensor. Possible Solutions: A lot of Times, Cleaning the MAF Sensor and Finding/Fixing Vacuum Leaks fixes the Problem. , P0171 2016 Chevrolet Silverado Code - Fuel Trim System Lean Bank 1 - Code Popularity: 743 Views - Repair Importance Level: 3/3 - Repair Difficulty Level: 3/3. ... If the P0171 is set in along with the P0174 code, it is highly likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air ..., May 14, 2018 · P0171, P0174, P0300. Hello everyone, first time on this forum but my trucks got me stumped. Im trying to get my truck to pass emissions, but I've got DTCs and that's an automatic fail where I live. The previous owner sold it because he couldn't get it to pass emissions either, so far I've changed the intake manifold gaskets and MAF sensor, the ... , 4 days ago ... Code p0174 chevy silverado. Things To Know About Code p0174 chevy silverado. Engine Code P0174: System Too Lean (Bank 2). The fuel system is ..., 13 posts · Joined 2017. #17 · Jan 2, 2018. I put in a new Delphi fuel pump and Maf sensor.The P0171 and P0174 codes went away.It could have been the Maf sensor or the crappy K&N intake might have been leaking.The fuel pressure is still low 50 with a new pump.I'm getting P0300 code at idle.When I hooked scanner up it's misfiring on …, p0101, p0171, p0174. I picked up this 04 silverado 1500 4x4 a few weeks ago. CEL is on and giving me those three codes. I replaced intake manifold gasket and cleaned MAF. Everything looks good and as far as I can tell all hoses between MAF and engine look great. Anyway, I cleared the codes and they popped up about two days later., If anyone's ever corrected the P0171/P0174 codes, please speak up! Save Share. Like. T. ... Chevy Silverado and GMC Sierra Forum. 1.4M posts 182.9K members, Jan 3, 2013 · If anyone's ever corrected the P0171/P0174 codes, please speak up! Save Share. Like. T. ... Chevy Silverado and GMC Sierra Forum. 1.4M posts 182.9K members , Jul 11, 2018 · P0171 and P0174 both indicate that there is a lean condition present in your Chevy Silverado. By themselves, these are some of the most common OBD2 codes. When they are together, it indicates that the entire engine is running lean. Definition Both of these codes are generic, which means they have the same meaning. , p0171 and p0174. Guys, I need some help here. I have a 2004 Silverado, 2500HD 4wd. The knock sensors were bad so I replaced them. I got a new intake gasket when I put it back together and ever since I've been blowing these two codes. When I keep the engine under 2K RPMs it is fine, but under a load it loses power and starts to backfire., 02 Chevy Silverado 4.3L has codes p0171 and p0174 - Answered by a verified Chevy Mechanic. We use cookies to give you the best possible experience on our website. ... 2003 Chevy Silverado CK Engine Code P0171 and P0174 THIS IS A FUEL SYSTEM LEAN BANK 1 AND 2 WHAT IS THE FIX FOR THIS TROUBLE CODES ..., Truck Talk. Engine. Vortec 5300 5.3L V8, Failed or Faulty Oxygen Sensor (bank 1, sensor 1) Sticking/Plugged or Failed Fuel Injector. Low Fuel Pressure (possible plugged/dirty fuel filter!) Exhaust Leak between Engine and first Oxygen Sensor. Possible Solutions: A lot of Times, Cleaning the MAF Sensor and Finding/Fixing Vacuum Leaks fixes the Problem., Learn what a P0174 code means and the most likely causes. The definition of a P0174 code is System Too Lean (Bank 2). Bank 2 is the bank of cylinder that does NOT contain cylinder #1. In this case, the oxygen sensor upstream from the catalytic converter is …, Oct 11, 2021 · A sensor cluttered with dust or debris paints an inaccurate picture of the air flowing in, triggering the P0101 code. Cleaning it with a MAF sensor cleaner can sometimes do the trick. However, if cleaning doesn’t work or the sensor is damaged, it’s time for a replacement. , The code P0171 and P0174 are system lean codes and are almost always caused by a plugged fuel system or low fuel system pressure. The filter is part of the pump assembly so the first thing I can suggest is getting the fuel pressure tested. It is supposed to be 55-62 psi. Ask Your Own Chevy Question., P0171 and P0174 all indicate the engine is running lean. Not enough fuel or too much air such as a vacuum leak. P0300 indicate that the engine is misfiring, likely due to the fact that it is running lean. P0101 indicate a Mass AirFlow sensor reading being irrational. Possibly because the sensor has failed of there is a vacuum leak which will ..., So today I was driving my 04 GMC Sierra 1500 4.8L V8 and the check engine light started blinking and it began to misfire. Used a code reader and got codes P0101 MAF Sensor Performance, P0171 Fuel Trim System Lean Bank 1, P0174 Fuel Trim System Lean Bank 2, and P0300 Engine Misfire Detected. I cleaned the MAF sensor and the problems …, Hi Everyone: So I did the fuel injector cleaning just for the Injectors, the engine ran a little better but still high fuel trims!The engine was full of carb..., Apr 5, 2019 · A P0174 is a code that says it all. Something is wrong with the exhaust, but until its fixed the car will expunge more fuel. However, what if it was the oxyg... , The weight of a Chevy Silverado varies based on the model, cab type, bed size and engine type. For example the 2015 Chevy Silverado 1500 with a regular cab and long box weighs 4,68..., May 2, 2022 ... 1997 Chevrolet Suburban (Lean codes P0171/P0174) ... System Too Lean - Code P0171 or P0174 on Your Car or Truck ... P0171and P0174 CODES CHEVY VORTEC ..., The P0171 and P0174 are pointing to both banks running "lean". This means there is too much air or not enough fuel in the fuel/air mixture. When these codes are set together, there are a few different things that can cause this issue. First- a fuel pressure reading should be taken to ensure the fuel pump is working at normal capacity., Sep 27, 2009 · The following diagnosis might be helpful if the vehicle exhibits the described symptoms. Check Engine Light with a P0300 due to 2 - 4 cylinders misfiring on the same bank of the engine. DTCs P0171, P0172, P0174 or P0175 may also set for the misfiring bank. Perform a fuel injector balance test for all 8 cylinders. , Apr 6, 2022 · Common Reason: Code P0174 is often related to a vacuum leak. Combustion engines run most efficiently when they maintain an air-fuel mixture ratio of 14.7 parts air to 1 part fuel. When there are more than 14.7 parts air to 1 part fuel in the air-fuel mixture, a lean condition exists and code P0174 is triggered.