21NA280

Bulletin No.:
Service Bulletin
Date:
21-NA-280
December, 2021
INFORMATION
Subject:
Information on Engine Run-On, Rough Running, Malfunction Indicator Lamp (MIL)
Illuminated - DTC P0172 Set
This bulletin replaces PIP4783B. Please discard PIP4783B.
Brand:
Model:
LaCrosse
Buick
Chevrolet
GMC
Model Year:
VIN:
from
to
2010
2012
from
to
Engine:
Transmission:
2.4L (LAF, LEA)
Regal
2011
2011
2.4L (LAF)
Verano
2012
2017
2.4L (LEA)
Captiva
2012
2016
—
—
2.4L (LAF, LEA)
Equinox
2010
2017
2.4L (LAF, LEA)
Terrain
2010
2017
2.4L (LAF, LEA)
—
Involved Region or Country
North America
Condition
Some customers may comment on one or more of the following conditions:
• Engine run-on
• Rough idle
• MIL illuminated
Technicians may find DTC P0172 set in the Engine Control Module (ECM).
Cause
This condition may be caused by fuel contamination in the crankcase.
– This may be a result of the high pressure fuel pump leaking fuel into the crankcase
when the plunger is depressed.
Correction
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 J-37287 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.
Version
1
Modified
Released November 29, 2021
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.
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