Here is a copy of the bulletin...has been known about for a year now.
#PIP4783: Engine Run-On Rough Running And SES Light With A P0172 DTC - (Mar 31, 2010)
Subject: Engine Run-On, Rough Running, and SES Light with a P0172 DTC
Models: 2010 Chevrolet Equinox
2010 GMC Terrain
with 2.4L Engine (RPO LAF)
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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some customers may complain of rough running, engine run-on for a few seconds, and a SES light due with a P0172 DTC stored. In most cases, the crankcase will have obvious fuel contamination.
This may be a result of the high pressure fuel pump leaking fuel into the crankcase when the plunger is depressed.
Recommendation/Instructions:
If this concern is encountered, perform SI diagnosis and repair as necessary. If SI diagnosis does not isolate the cause of this concern, check the low side fuel pressure leakdown with a mechanical gauge as outlined in SI Fuel System Diagnosis. If fuel pressure leakdown is present with the J37287 Fuel Line Shut-off Adapter installed and closed, follow the SI Fuel Pump Replacement Procedure to replace the high pressure fuel pump. Also change the engine oil and filter to complete the repairs.
Here is a link to another thread you may find interesting reading...the thread gets interesting around page 8
http://www.equinoxforum.net/index.php?topic=2280.msg27950#msg27950
Hope this helps
#PIP4783: Engine Run-On Rough Running And SES Light With A P0172 DTC - (Mar 31, 2010)
Subject: Engine Run-On, Rough Running, and SES Light with a P0172 DTC
Models: 2010 Chevrolet Equinox
2010 GMC Terrain
with 2.4L Engine (RPO LAF)
--------------------------------------------------------------------------------
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some customers may complain of rough running, engine run-on for a few seconds, and a SES light due with a P0172 DTC stored. In most cases, the crankcase will have obvious fuel contamination.
This may be a result of the high pressure fuel pump leaking fuel into the crankcase when the plunger is depressed.
Recommendation/Instructions:
If this concern is encountered, perform SI diagnosis and repair as necessary. If SI diagnosis does not isolate the cause of this concern, check the low side fuel pressure leakdown with a mechanical gauge as outlined in SI Fuel System Diagnosis. If fuel pressure leakdown is present with the J37287 Fuel Line Shut-off Adapter installed and closed, follow the SI Fuel Pump Replacement Procedure to replace the high pressure fuel pump. Also change the engine oil and filter to complete the repairs.
Here is a link to another thread you may find interesting reading...the thread gets interesting around page 8
http://www.equinoxforum.net/index.php?topic=2280.msg27950#msg27950
Hope this helps
