PIP5829A

Bulletin No.: PIP5829A
Published date: 01/9/2023
Preliminary Information
PIP5829A MIL Illuminated With DTC P0299 and/or Cold Start Rattle
Noise From the Engine Compartment
Models
Brand:
Model:
Model Years:
VIN:
from
Engine:
to
Transmissions:
BUICK
Encore GX
2019 - 2023
All
All
1.2L (LIH)
All
CHEVROLET
Trailblazer
2020 - 2023
All
All
1.2L (LIH)
All
Involved Region or Country North America.
Condition
Some customers may comment that the MIL light is illuminated and/or Cold Start
Rattle Noise From the Engine Compartment.
A P0299 may be stored Current or in history.
Cause
Potential turbocharger wastegate linkage wear.
Correction:
If the complaint is a cold start rattle noise, put the car on a hoist and use the remote start feature to start the
vehicle while prepared to touch the wastegate actuator rod with a long screwdriver.
This rod is visible from under the vehicles near the catalytic converter.
If during the cold start converter light o procedure the rattle noise can be heard and is then damped by touching
the wastegate actuator rod with the screwdriver, then the premature wastegate linkage wear is present and will
likely be solved by replacing the turbocharger.
If the complaint is P0299 instead, the follow the procedure below.
Disconnect the Turbocharger Wastegate Solenoid Vacuum Supply Hose (shown in g 1 below) from the
Turbocharger Wastegate Solenoid Valve.
Connect the EN-23738-A Vacuum Pump to the Turbocharger Wastegate Solenoid Vacuum Supply Hose.
Engine » Idling.
Verify the tool reading: EN-23738-A Vacuum Pump = −50 kPa (−0.5 bar, 15 in Hg).
If the desired pressure/vacuum cannot be achieved or does not hold steady.
Ignition/Vehicle » O .
Test or replace the component: Vacuum Pump Assembly / related hoses.
If the desired pressure/vacuum can be achieved and holds steady.
Engine » O .
Reconnect the Turbocharger Wastegate Vacuum Supply Hose to the Turbocharger Wastegate Solenoid Valve.
Disconnect the Turbocharger Wastegate Solenoid Actuator Supply Hose (shown in g 2 below) from the
Turbocharger Wastegate Solenoid Valve.
Connect the EN-23738-A Vacuum Pump to the Turbocharger Wastegate Solenoid Valve Actuator supply port.
Engine » Idling.
Verify the tool reading: EN-23738-A Vacuum Pump = Less than −17 kPa(−0.17 bar, 5 in Hg).
If −17 kPa(−0.17 bar, 5 in Hg) or greater.
Test or replace the component: Q42 Turbocharger Wastegate Solenoid Valve.
If less than −17 kPa(−0.17 bar, 5 in Hg).
Engine Speed @ Wide Open Throttle — For 2 s.
Verify the tool reading: EN-23738-A Vacuum Pump = Greater than −50 kPa(−0.5 bar, 15 in Hg).
If less than−50 kPa(−0.5 bar, 15 in Hg).
Test or replace the component: Q42 Turbocharger Wastegate Solenoid Valve.
If Greater than −50 kPa(−0.5 bar, 15 in Hg).
Remove the Turbocharger from the vehicle and inspect the Turbocharger Wastegate linkage for excessive wear /
play. (Compare to replacement Turbocharger if necessary).
If found, replace the Turbocharger, and perform: Intake System Learned Values Reset.
Warranty Information
For vehicles repaired under the Emission coverage, use the following labor operation.
Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for
coverage information
Labor Operation
4023250
4088328*
Description
Labor Time
Turbocharger Wastegate Regulator Solenoid Valve
Use Published Labor Time
Replacement
Turbocharger Replacement
3.3 Hrs.
*This is a unique Labor Operation for Bulletin use only.
Version History
Version
Modified
2
11/22/2021 - Created on.
01/09/2023 - Updated to add 2023 model year and updating
the condition and correction statements.
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