040730013D

File in Section:
Service Bulletin
Bulletin No.:
Date:
07 - Transmission/Transaxle
04-07-30-013D
November, 2017
INFORMATION
Subject:
Automatic Transmission Shift and Engine Driveability Concerns and/or MIL ON Due to
Aftermarket Oil Bath Air Filter Use
Models:
2018 and Prior GM Passenger Cars and Light Duty Trucks
Attention: This Bulletin also applies to any of the above models that may be Export from North
America vehicles.
This Bulletin has been revised to add the 2017-2018 Model Years. Please discard Corporate
Bulletin Number 04-07-30-013C.
DO THIS
DON'T DO THIS
Inspect the vehicle for an
aftermarket oil bath air filter
that may be excessively
over oiled.
DO NOT repair or replace
any MAF or MAF/IAT sensor
under warranty if the Cause
of the Condition is a result of
the use of an oil bath air filter
that is excessively over oiled
resulting in contamination of
the sensor.
The use of an aftermarket oil bath air filter that is
excessively over oiled may result in any of the following
to occur:
• The malfunction indicator lamp (MIL) may
illuminate and a diagnostic trouble code(s) DTC
may set.
• The automatic transmission may shift early and/or
late, slipping and/or damaged clutch(es) or
band(s).
• Engine driveability concerns such as but not
limited to: poor acceleration from a stop, stumble,
rough idle and/or limited engine RPM range.
The oil that is used on the air filter elements may be
transferred onto the Mass Air Flow (MAF) or Mass Air
Flow/Intake Air Temperature (MAF/IAT) sensor
resulting in contamination and poor performance.
This contamination will result in the Grams per Second
(GPS) signal and/or the Hertz (Hz) frequency signal
from the MAF or MAF/IAT sensor to be skewed, low or
generally out of range. The Hertz and/or Grams per
Second parameters on the scan tool should be
compared to a like vehicle with an OEM air box and air
filter under the same driving conditions to verify the
cause of the concern.
⇒ If an aftermarket oil bath air filter is used, the
Service Technician should inspect the MAF or MAF/
IAT sensor element and the air induction hose for
contamination of oil prior to making warranty
repairs.
Transmission or engine driveability concerns as a
result of the MAF or MAF/IAT sensor being
contaminated with oil from the use of an aftermarket
oil bath air filter that may be excessively over-oiled
are not considered to be warrantable repair items.
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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