Question about Chevrolet Tahoe
Code p0178 is fuel compensation sensor circuit low input.
Code p0440 is evap emmision control system malfunction.
I retrieved this blog for you on the Flex fuel Issue.
How to fix SES P0178 and P0179 - Flex Fuel Sensor
What is Flex Fuel?
A flexible fueled vehicle (FFV) has a single fuel tank, fuel system, and engine. The vehicle is designed to run on unleaded gasoline and an alcohol fuel (usually ethanol) in any mixture. The engine and fuel system in a flex-fuel vehicle must be adapted slightly to run on alcohol fuels because they are corrosive. There must also be a special sensor in the fuel line to analyze the fuel mixture and control the fuel injection and timing to adjust for different fuel compositions.
What Service Engine Soon codes does it throw?
P0178 and P0179 are directly related to the sensor its self
P0178 - Fuel Composition Sensor. Sensor Circuit Low Volts
P0179 - Fuel Composition Sensor. Sensor Circuit High Volts
Can this really effect anything?
Yes, It can cause your truck to run richer then it should.
Also codes (P0440), should go away after replacing the Flex Fuel sensor.
How much does this sensor cost and what is the part number?
There are 2 part numbers (both are the same part):
The first one: 12568450 (older part number)
The second one: 12570260 (most recent)
From a GM dealer this part will run $613
From GMPartsDirect.com it runs $350
dealer will charge around $900-1100 to fix!
Where is the sensor located and what does it look like?
Passenger side, Front frame rail. Right behind the wheel well.
It has 2 fuel lines coming out of it and 1 power.
Actual pic from engine area:
Stock picture of the part:
What kind of tools are needed to replace this myself?
Size 13mm Socket
Fuel Line disconnects ($5 - $10)
I CiTahoe 2002 service engine soone - fuelline.jpgrrect one to use:
How long does it take and is it easy?
Yes it is easy, and it takes about 2-3 hours depending on how you go about getting to it. Take your time and be careful! (a little bit of gas will come out of those lines)
I pulled off the passenger side wheel and went thru the wheel well with a friend under the truck helping. Hard to remove I don't recommend a DIYer on this one.
Posted on Aug 29, 2010
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this 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.
Here's a link to this great service
Posted on Jan 02, 2017
Tips for a great answer:
Mar 01, 2015 | 2002 Buick Regal
Battery and brake Warning lights on
--------------2002 Ford Windstar: Brake Warning Light ON dash? http://schematicsdiagram.blogspot.in/2012/06/2002-ford-windstar-brake-warning-light.html
-------------ABS & Brake warning lights remains steady on dash? http://schematicsdiagram.blogspot.com/2011/12/abs-brake-warning-lights-remains-steady.html
-----------Chevrolet Tahoe Hood open warning on dash and alarm sounds? http://schematicsdiagram.blogspot.com/2011/12/chevrolet-tahoe-hood-open-warning-on.html
-----------2005 Chevy Impala: Service Vehicle Soon Warning Light? http://whoisbyme.blogspot.in/2012/06/2005-chevy-impala-service-vehicle-soon.html -------------- Malfunction Indicator Light ON http://whoisbyme.blogspot.in/2012/06/malfunction-indicator-light-on.html
-----------Car Runs Fine But Check Engine light is ON?
Check engine light with codes P2195 and P2197?
How to Read Codes from Check Engine Light? http://schematicsdiagram.blogspot.com/2011/12/how-to-read-codes-from-check-engine.html
-------------These will help.Thanks.
Nov 26, 2012 | Subaru Impreza Cars & Trucks
Jun 03, 2010 | 2000 Chevrolet Tahoe
Jan 24, 2010 | 1995 Chevrolet Tahoe
Dec 29, 2009 | 2002 Chevrolet Tahoe
Nov 05, 2009 | 2002 Chevrolet Tahoe
Sep 14, 2009 | 1998 Chevrolet Tahoe
Apr 11, 2009 | 2002 Chevrolet Tahoe
Jan 15, 2009 | 2002 Chevrolet Tahoe
446 people viewed this question
Usually answered in minutes!