Question about GMC Sierra 1500

1 Answer

I have a '06 sierra small block. The code that is showing up is that the engine is running too lean. Cleaned air filter and re-set. Still showing too lean. Any suggestions? Chico Thuon Vail, Colorado

Posted by on

  • toneman2121
    toneman2121 May 31, 2010

    what is the code?

  • Jonathan S
    Jonathan S May 31, 2010

    This may be an O2 sensor malfunction or a possible vacuum leak. What code is it P0171 P0174 this would indicate which bank is triggering your light to come on.The 171 would be the driverside bank and the 174 would be passenger side. Are these the only codes or are there more codes?



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 3,113 Answers

Check for vacuum leak

Posted on May 31, 2010


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get to try the service completely Free afterwhich it costs $6 per call and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

2005 ford taurus running too lean

This would probably be an air leak. Check all engine seams and vacuum lines with the engine running. Take a spray bottle filled with water and when the engine draws in the water spray, the RPM will change.

Jan 30, 2014 | Ford Cars & Trucks

1 Answer

I have a 2004 Suzuki Verona with check engine light on showing codes 0171, 0174, and 1670. could someone have a solution

Hello! The first two codes are indicating the engine is running to lean...A vacuum leak or a dirty Mass Air Flow (MAF) sensor can cause these codes...The third code is a communication error between ECM (Computer) and ABS (automatic Braking System)...Lets put that one on the back burner...Perform the following and send a comment with results...

Check for loose or broken vacuum lines...Follow diagram under hood...

The MAF is located between the air filter and the throttle body...It can be cleaned, If contaminated with debris or if you are using an after market air filter, with oil....Remove MAF (see photo below) and spray with electronic parts cleaner (sold at auto stores and Radio Shack)...Then replace...Clear codes by disconnecting battery for 5 minutes...Make sure you have your radio code before disconnecting battery...


Oct 17, 2011 | 2004 Suzuki Verona

1 Answer

2001 Chevy Impala 3.8L. P0171 lean fuel code. We have replaced the MAF from a previous code. O2 sensors scan good, as does the fuel pump all within specs. Car is running like junk. 81K, Dropped Cat...

DTC P0171 - System Too Lean (Bank 1)
Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.

According woth your previous tasks, inspect all vacuum and PCV hoses, replace if necessary.

Oct 04, 2011 | 2004 Chevrolet Impala

2 Answers

Lean idle air control valve

Idle Air Control valves are not "LEAN" or "RICH". They can either control the idle speed correctly or they cannot. What kind of problem are you experiencing?

Aug 30, 2011 | 2005 Chevrolet Equinox

1 Answer

2003 GMC Sierra Has recently developed rough idle/lope at idle which sometimes goes away. Runs fine otherwise. Scan codes-Lean condition bank1 and bank2. Random misfires on all cylinders. Fuel pressure...

You never replace anything, on a Wishing,Hoping,Pushing,Poking,diagnostic approach

You learn the vehicles Systems,Test,then Replace,if you have a failed component.

Work on the Misfire Issues.
Then you lean O2 Codes will go away.

Not a the plugs.

Think lean---Vacuum leaks,EGR Valve leak,EVAP System leaks,anything with a hose that lets air into the intake system.
Exhaust System leaks,near sensors

Nov 24, 2010 | 2003 GMC Sierra 1500

4 Answers

Check Engine light is on my 1997 F150 with a small V-8. The tester returns codes P0171, P0172, P0174 and P0175. What does all this mean?

those codes are for lean engine condition look for vac leaks at the back of engine to the pcv valve could hear hissing noise with engine running also check egr valve to be stuck open also when was last fuel filter changed? hope this helps .

Sep 16, 2009 | 1997 Ford F150 Regular Cab

3 Answers

P0171 code on 99 Ford Escort ZX2 2.0L

Check vacuum hoses to MAP sensor. They can get porous after a while. Also check hose to EGR valve.

Jun 27, 2009 | 2001 Ford Escort ZX2

3 Answers

99 RX300 Engine code keeps coming up lean

Check for vacuum leaks. ie, vacuum lines them selves, the rubber tube that runs from the air filter to the throttle body. If it has a plastic intake manifold, possibly the rubber port seal gaskets between it and the engine. Lean codes are set when the PCM isn't monitoring all the air coming into the engine (vac leak) or low fuel pressure.

Jun 24, 2009 | 2001 Lexus RX 300

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

56 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts


Level 3 Expert

76630 Answers


Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides