PIP5549A
Service Bulletin Details
Public Details for: PIP5549A
This preliminary information communicates a diagnostic trail to a likely conclusion for lean codes on these vehicles.
- 2019 - 2018 - 2017 - 2016 - 2015 - 2014 - 2013 - 2012 -
Models from 2017
| 2017 BUICK ENCLAVE |
| 2017 CADILLAC XTS |
| 2017 CHEVROLET EQUINOX |
| 2017 CHEVROLET IMPALA |
| 2017 CHEVROLET TRAVERSE |
| 2017 GMC ACADIA |
| 2017 GMC TERRAIN |
Models from 2016
| 2016 BUICK ENCLAVE |
| 2016 CADILLAC XTS |
| 2016 CHEVROLET COLORADO |
| 2016 CHEVROLET EQUINOX |
| 2016 CHEVROLET IMPALA |
| 2016 CHEVROLET TRAVERSE |
| 2016 GMC ACADIA |
| 2016 GMC CANYON |
| 2016 GMC TERRAIN |
Models from 2015
| 2015 BUICK ENCLAVE |
| 2015 CADILLAC XTS |
| 2015 CHEVROLET COLORADO |
| 2015 CHEVROLET EQUINOX |
| 2015 CHEVROLET IMPALA |
| 2015 CHEVROLET TRAVERSE |
| 2015 GMC ACADIA |
| 2015 GMC CANYON |
| 2015 GMC TERRAIN |
Models from 2014
| 2014 BUICK ENCLAVE |
| 2014 CHEVROLET TRAVERSE |
| 2014 GMC ACADIA |
Models from 2013
| 2013 BUICK ENCLAVE |
| 2013 CHEVROLET TRAVERSE |
| 2013 GMC ACADIA |
Models from 2012
| 2012 BUICK ENCLAVE |
| 2012 CHEVROLET TRAVERSE |
| 2012 GMC ACADIA |
Bulletin No.: PIP5549A Published date: 05/7/2019 Preliminary Information PIP5549A Diagnostic Tip - SES Light Is On With DTCs P0171 and/or P0174 Set Models Brand: Model: Model Years: VIN: from Engine: to Transmissions: Buick Enclave 2012 - 2019 All All 3.6 LLT, 3.6LFY All Cadillac XTS 2015 - 2019 All All 3.6 LFX All Chevrolet Colorado 2015 - 2016 All All 3.6 LFX All Chevrolet Equinox 2015 - 2017 All All 3..6 LFX All Chevrolet Impala 2015 - 2019 All All 3.6 LFX All Chevrolet Traverse 2012 - 2019 All All 3.6 LFX, 3.6 LFY All GMC Acadia 2012 - 2017 All All 3.6 LLT All GMC Canyon 2015 - 2016 All All 3.6 LFX All GMC Terrain 2015 - 2017 All All 3.6 LFX All Involved Region or Country North America Condition A customer may bring their vehicle to the dealer with a complaint of an SES light on. Upon diagnosis the technician may nd DTC’s P0171 and/or P0174 stored in the ECM. Cause Possible Vacuum leak in intake or Purge. Correction: 1. Ensure vehicle is at operating temperature then monitor and record Long Term & Short Term fuel trims. Plug both the manifold hole and the disconnected foul air tube hole. 2. Shut the engine o and disconnect the foul air tube from the intake manifold. Detach foul air tube from connection shown above at arrow 1 and plug both sides 3. Restart the vehicle and monitor the Short Term & Long Term fuel trims. Results: 1. If both the previously recorded Long term and Short term fuel trims were at a positive value above 5 and now the Short term has gone to a consistent negative value during this test replace the foul air tube. 2. If the previously recorded Short term is at a value above positive 5 and the long term is between -2 and 2, but during the test the short term has gone to a zero or negative value replace the foul air tube. 3. If the fuel trims in steps 1 or 2 did not change proceed with purge valve test. Note: In some cases the Intake Manifold may have to be replaced if foul air tube replacement by itself doesn’t address the vacuum leak. Only replace manifold if test above impacted fuel trims. Purge Valve Test If during the test procedure outlined above the fuel trims didn’t change after foul air tube was capped o proceed to the following test. 1. Shut the vehicle o and ensure the foul air tube and manifold plugs have been removed and re-install the foul air tube to the manifold 2. Locate the purge valve on the intake manifold (see below) 3. Disconnect vacuum hose and power supply from purge valve (see below) 4. Restart the vehicle then place your nger or a vacuum gauge over the open port on the purge valve. 5. If you feel vacuum or read vacuum on the gauge at the port of the valve it will need to be replaced. Shut the vehicle o and then re-install detached components 1. If no vacuum was felt or measured at purge valve port refer to the applicable DTC in service information to diagnose further. NOTE: When a permanent repair or part replacement is identi ed a PI revision or bulletin will be submitted. Warranty Information For vehicles repaired under warranty, use the current labor time for the actual repair made. Version History Version Modi ed 2 01/23/2018 - Created on 05/07/2019 - Updated to add Model Year and correction section. © 2019 General Motors. All Rights Reserved.