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2010 Chevrolet Malibu 2.4L Eng LS
INTERMITTENT ILLUMINATION OF MALFUNCTION INDICATOR LAMP
(MIL)/CHECK ENGINE LIGHT, DTC P0172 SET (VERIFY ALCOHOL CONTENT
INFORMATION IN PCM)
TECHNICAL SERVICE BULLETIN
Reference Number(s): 10-06-04-004B, Date of Issue: April 30, 2012
Affected
2010 Chevrolet Malibu 2010 Pontiac G6 Equipped with 2.4L 4 Cylinder Engine
Model(s):
(VINs B, 0 - RPOs LE5, LE9) Please refer to GWM/IVH
This bulletin is being revised to update the models to include the 2010 Pontiac G6.
Supercedes: Please discard Corporate Bulletin Number 10-06-04-004A (Section 06 Engine/Propulsion System).
Superceded Bulletin(s): 10-06-04-004A, Date of Issue: January 13, 2011
CONDITION
Some customers may comment on an intermittent illumination of the malfunction indicator lamp
(MIL)/check engine light.
Technicians may find a DTC P0172 set.
CORRECTION
Use the procedure below to determine if the PCM has the incorrect alcohol content information.
1. Verify the actual measured percentage of alcohol content using the J-44175-A tester.
Refer to Alcohol in Fuel Diagnosis in SI.
If the actual alcohol is less than 15%, determine the "Fuel Alcohol Content" using the
Tech 2®.
2. Install the Tech 2® and build the vehicle as a 2010 and select Powertrain.
3. Build the vehicle with an LE9 engine (even if it has the LE5 engine).
1. Select Special Functions.
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2. Select Fuel System (F2).
3. Select Fuel Composition Reset (F1).
4. The first parameter is "Fuel Alcohol Content" displayed as a percentage. If
the Fuel Alcohol Content percentage is above 25%, this is the probable
cause of DTC P0172.
5. From this screen the "Fuel Alcohol Content" can be reset to zero by pressing
the lower right Tech 2® button. It will then display 0% when it's reset. Finally,
reprogram the PCM with the latest calibration. This will correct for the PCM
alcohol calculations.
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NOTE:
The PCM must be reset from this
screen. It does not reset to zero when
the PCM is reprogrammed.
WARRANTY INFORMATION
For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
J7825*
Alcohol Content Reset and Reprogram
0.8 hr
*This is a unique labor operation for bulletin use only. It will not be published in the Labor
Time Guide.
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