PIP-5203-A

SB-10056259-4900
Service Bulletin
File in Section:
-
Bulletin No.:
PIP5203A
Date:
July, 2014
PRELIMINARY INFORMATION
Subject:
Poor Engine Performance P0089 P228D P0171 Whine Noise From High Pressure
Fuel Pump
Models:
2010-2011 Buick LaCrosse
2011 Buick Regal
2010 - 2011 Chevrolet Equinox
2010-2011 GMC Terrain
Equipped with 4 cyl engine (RPO LAF)
This PI was superseded to update Warranty Information. Please discard PIP5203
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern
Some technicians may comment of a service engine soon light on, low engine power or rough idle after engine,
intake camshaft or intake camshaft actuator replacement. Typically, they will find DTC's P0089 and P228D set in the
ECM. The high side fuel pressure at idle will likely be high, around 2000-2500 PSI. They may also note a whine type
noise from the high pressure fuel pump. These symptoms occur if the intake camshaft with actuator sprocket are not
the correct parts for the vehicle build. A P0171 is also possible if the incorrect injectors were installed.
Recommendation/Instructions
If the symptoms above are noted after engine, intake camshaft or intake camshaft actuator replacment. It is likely the
incorrect parts have been installed. This can be confirmed by removing the camshaft cover and noting the CMP
actuator sprocket colors or part number on the actuator sprockets.
A 2010 engine has a black exhaust actuator sprocket and a gray intake actuator sprocket. Each camshaft actuator
sprocket will have a different part number. A 2011 engine has black camshaft actuator sprockets for both the intake
and exhaust camshafts. Both camshaft actuator sprockets will have the same part number.
Below is an example of a 2011 intake camshaft actuator part number 12621505 and black in color (plastic cover
piece).
3872270
The camshafts can be identified by the last four digits of the part number located on a machined surface between the
number 2 and number 3 cylinder camshaft lobes.
Below is an example of a 2011 intake camshaft part number 12634207.
3872269
3872271
Before a 2010 service engine was available, technicians were directed to install a 2011 service engine into a 2010
vehicle. It was necessary to swap parts from the old engine to the new engine to make it a 2010 build. These parts
included the intake camshaft and actuator sprocket, and the fuel rail assembly with injectors. If these parts from the
original engine were damaged, new parts designed for a 2010 vehicle were installed. When the intake camshaft and
actuator sprocket are swapped, dealers should reference timing procedures for a 2010 model year vehicle. This is
important because the intake actuator locating notch in the camshaft moves from about the 10:00 starting position
on a 2011 engine to about the 5:00 starting position on a 2010 engine.
The fuel injectors have the part numbers on the injector body. When swapping the fuel rail, if the injectors are not
removed from the rail, the retaining clips do not have to be replaced. The Teflon seals at the injector tips however,
must be replaced whenever the injectors are reinstalled onto an engine.
The fuel pipe from the high pressure pump to the fuel rail must also be replaced whenever it is removed.
Warranty Information
There is not a labor time or labor operation associated with this PI because the labor time is considered part of the
original repair.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is
resolved without completing every step, the remaining steps do not need to be performed.