PIP5624

Service Bulletin Details

Public Details for: PIP5624

This preliminary information communicates to the dealer an issue where the vehicle's engine may stumble and/or stall at startup. The dealer is to evaluate for a faulty aftermarket or incorrect upstream oxygen sensor.


- 2017 - 2016 - 2015 - 2014 - 2013 - 2012 - 2011 - 2010 -

Bulletin No.: PIP5624
Published date: 02/4/2019
Preliminary Information
PIP5624 Diagnostic Tips For Stall / Stumble After Startup
Product Investigation Review Required
Models
Brand:
Model:
Model Years:
VIN:
from
to
Engine:
Transmissions:
Chevrolet
Equinox
2010 - 2017
All
All
2.4L LAF, LEA
All
GMC
Terrain
2010 - 2017
All
All
2.4L LAF, LEA
All
Involved Region or Country North America
Engine may stumble and / or stall after startup (hot or cold start).
Condition
Condition may be more noticeable when placed into gear.
Typically there are no related DTCs.
Cause
Faulty aftermarket or incorrect upstream Oxygen sensor (HO2S) installed.
Correction:
Monitor Upstream Oxygen sensor voltage when condition present.
It may be found that the voltage is skewing high (staying at 800mv or higher) causing the ECM to believe the
engine is running rich, resulting in an unnecessary lean out of the fuel system.
If the condition is not present with upstream oxygen sensor disconnected, this may con rm the oxygen sensor as
being the issue.
Upon further inspection it may be found that the upstream oxygen sensor had been replaced with a
faulty aftermarket or incorrect upstream oxygen sensor (sensor for di erent vehicle application / position).
This issue is currently under review and this PI will be updated to a Bulletin or incorporated into Service
Information diagnostics.
Version History
Version
Modi ed
1
02/04/2019 - Created on
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