Question about GMC Yukon

1 Answer

1996 yukon has rough idle and sets code p0172

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 15,935 Answers

P0172 is system running rich. Classic case of bad/dirty injectors. Have them cleaned for about $60 each, buy a cleaning kit HERE or replace them (pricey). Diagnostic Trouble Code (DTC) P0172 Fuel Trim System Too Rich Detailed Diagnostic Assistance: Note: After repairs, use the scan tool Fuel Trim Reset function to reset the long-term fuel trim to 128 (0%). Fuel pressure ? An excessively low pressure will make the system lean. Monitoring fuel pressure while driving the vehicle at various road speeds and/or loads may become necessary here. Map sensor - An output that enables the ECM to sense a manifold pressure which is less than normal (high vacuum) can drive the system lean.In such a case disconnecting the MAP sensor will permit the ECM to substitute a fixed (default) value for the MAP sensor. If disconnecting the sensor kills the lean condition then substitute a known good sensor and recheck. Fuel contamination - In trace amounts, water , near the in-tank fuel pump inlet can be added to the injector. water results in a lean exhaust condition and can set DTC P0171. Check for poor O2S or MAP sensor connection at the ECM. Inspect the harness connectors for the following conditions: Improper mating Damaged terminals Broken locks Improperly formed or Backed-out terminals Poor terminal-to-wire connection · Also examine the wiring harness to check whether there is any damage. · If the harness seems flawless, then note the O2S display on the scan tool as you move the connectors and the wiring harness related to the engine harness. · Any difference in the display will denote the location of the fault. · You must check the 5 volt reference circuits to inspect whether a short to voltage is in vogue in case you see any DTC P1404 is set. · You also need to see if there is any restricted exhaust system. · Probe the 5 volt reference sensors for abnormal readings in case a shorted 5 volt reference circuit creates a DTC P0172 to set. Thanks for using FixYa!!

Posted on Sep 25, 2009

  • blueextc3221
    blueextc3221 Sep 25, 2009

    sorry that all ran together. Looked good on my screen. I dont know what happened.



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.
the service is completely free 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

My check engine light is pulling up code P0172 my read out says the problem is in bank one only

P0172 is bank 1 rich. May have a fuel injector stuck open or a bad o2 sensor.

Jul 25, 2015 | Cars & Trucks

1 Answer

I got a code p017.2 AND P017.1 for a 2005 dodge grand caravan sxt 3.8l

Po171 not P017.1 system lean

P0172 not P017.2 system rich

bad mass air flow sensor , O2 sensor , PVC system problem

Jun 13, 2015 | 2005 Dodge Grand Caravan

1 Answer

Car Runs to Lean. Help!
P0172 is running too rich, not lean. Was it a typo, or did you really have P0172 (just like my Buick, same two codes [0300, 0172]- and still working on it). Go to the site above and look. (All codes are there for descriptions and diagnosing procedures.)
If it is too lean, possibly a vacuum leak from a bad hose or the intake manifold.

Feb 09, 2014 | Cars & Trucks

1 Answer

Code p1072 came up..rough idle on and off. 2002 dodge caravan

There are many potential problems but first buy some spray MAF cleaner and clean the mass air flow sensor. It will set you back less than $10. Do not stick anything into the sensor. Just let the cleaner do the work.. Allow it to dry completely before installing. The link above will give you more avenues to help you diagnose the problem.

Aug 23, 2011 | 2003 Dodge Caravan

1 Answer

I was told I failed the NY inspection test due to error codes po172 and po300. What do these indicate is wrong and where the problem may be??

p0300 is code for miltible misfires. The p0172 is code for a rich reading from engine bank #1, this code may be set by the misfireing causing raw fuel to exit that bank to the sensor in the exhaust system. The most common cause is spark related, spark plugs, wires, dist. cap. etc. A less common cause is with the fuel injection system.

Jun 24, 2011 | 1996 GMC Yukon

1 Answer

1996 chevy truck 5.7L has codes P0172, P0172 were

p0172 is--system to rich ( bank 1). an oxygen sensor on bank 1, detected a rich condition ( to little oxygen in exhaust ) v6-v8 - v10 engines, bank 1 is the side of the engine that has # 1 cylinder. causes could be a vacuum leak in a hose, a dirty or bad maf sensor, or fuel pressure or delivery problems.

Oct 29, 2009 | 1996 Chevrolet K1500

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

Related Topics:

41 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts


Level 3 Expert

76848 Answers


Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

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

Answer questions

Manuals & User Guides