Bulletin No.: PIP5734
Published date: 06/10/2020

Preliminary Information
PIP5734 Check Engine Light On With P0521 and/or P06DE, P06DD
Models
Brand:

Model:

VIN:

Model Years:

from

Engine:

to

Transmissions:

Buick

Encore GX

2020

All

All

LIH (1.2L)

All

Chevrolet

Trailblazer

2021

All

All

LIH (1.2L)

All

Involved Region or Country North America
Condition

MIL on P0521 and/or P06DE, P06DD

Cause

Potential Engine Oil Pump Pressure Control Issue

Correction:
A Technician may encounter one of the listed vehicles with a P0521 and/or P06DE, P06DD stored current or in
history.
Perform the Engine Oil Pump Failure Screening Test.
Park the vehicle in a safe location, place the transmission in park and apply parking brake.
Connect GDS2 to the vehicle and delete any stored trouble codes.
Select: Module Diagnostics => [K20] Engine Control Module => Data Display => Engine Mechanical Data
Start and run engine for 15 minutes or until the engine coolant temperature reaches a minimum of 175 F.
1: Raise the engine RPM to 2000 and hold for 30 seconds.
2: Raise the engine RPM to 4000 and hold for 15 seconds.
3: Release the accelerator pedal and allow the engine to idle for 15 seconds.
Repeat steps 1 through 3 an additional 9 times for a total of 10 cycles from 2000 RPM to 4000 RPM and back to
idle speed.
Check the DTC Display Tab for trouble codes P0521, and/or P06DE, P06DD.
Exit the Engine Mechanical Data screen to save session log.
If P0521, P06DE, and/or P06DD set, Engine Oil Pump replacement and Lower Crankcase Extension port
inspections are required.
4: Refer to GSI for Oil Pump Replacement.
Once the Engine Oil Pan, Engine Oil Pressure Control Solenoid Valve, and Oil Pump have been removed, inspect
the three oil pump ports (1) and the Engine Oil Pressure Control Solenoid Valve port (2) for debris.
(See picture below)
If found, remove any debris from the ports using caution not to scratch or damage related surfaces.
Do not use brush type tools or cloth materials that may leave debris in the oiling circuit ports.

5: If P0521, P06DE, and/or P06DD did NOT set during this test, Review the GDS2 stored data to isolate a potential
Oil Pump Pressure Control issue by following the directions below.

1: Select Review Stored Data (1).

1: Highlight the VIN your are working with (1).
2: Highlight the Data to be displayed (2).
3: Select review (3).

1: Highlight parameter Engine Oil Pressure Control Solenoid Valve Command (1).
2: Select the Lock Parameter ICON (2).
3: Highlight Engine Speed and Engine Oil Pressure and Lock (3).

1: Select Line Graph to display the data (1).

In this example, each time that the engine RPM (1) is raised to 4000, the Engine Oil Pressure Control Solenoid
Valve Command (2) moves from ON (low pressure) to OFF (high Pressure).
The actual engine oil pressure (3) moves up to a normal 45-55 PSI range.

This is a normal pattern.

Anytime during engine idling (1) the Engine Oil Pressure Control Solenoid Valve Command may cycle rapidly
between on and o (2).
This is a normal characteristic of the system and is not an indication of engine oil pump failure.

In this example you see a normal oil pump switching pattern thru ten 4000 RPM cycles.

In this example you see Engine Oil Pressure Control Solenoid Valve Command defaulted to o (1) commanding
high oil pressure at all times.

The oil pump only achieved a normal high pressure in one of the ten increases to 4000 RPM @ (2) indicating a
failed engine oil pump.
Engine Oil Pump replacement and Lower Crankcase Extension port inspections are required. Refer to step #4.

In this example the Oil Pump made normal pressure on the rst three switches from low to high (1).
The 4th switch shows an abnormal pattern (2) followed by failures to achieve normal pressure in the 5th and 6th
switch (3) indicating a failed engine oil pump.
Engine Oil Pump replacement and Lower Crankcase Extension port inspections are required. Refer to step #4.

Parts Information
Description

Part Number

Quantity

PUMP ASM-OIL (W/ SCRN)

55503981

PAN ASM-LWR OIL

55509997

FILTER ASM-OIL

12696048

SEAL, OIL PUMP FL OW CONTROL V ALVE

55502517

1
1
1
1
5
4
1
1

OIL-ENG (1 Quart) - DEX OS1 GEN2 5W30 (US)

88865926

OIL-ENG (1 Liter) - DEX OS1 GEN2 5W30 (Canada)

19353385

SEALER-OIL PAN (1217H) (US)

19369831

SEALER-OIL PAN (1217H) (Canada)

19369832

Warranty Information
For vehicles repaired under the Powertrain coverage, use the following labor operations. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH) for coverage information.
Labor Operation

Description

4087388
4066070

Labor
Time
0.8
1.2

Engine Oil Pump Failure Screening Test and Data Review *
(Base) Oil Pump Replacement
Diagnosis Time (Excluding US/Canada) - You may claim up to the
ADD TIME:
allowable labor hours depending on actual time to perform
0.0-0.3
electrical diagnosis
Diagnosis Time (US/Canada only) - You may claim up to the
ADD TIME:
allowable labor hours depending on actual time to perform
0.0-1.0
electrical diagnosis
*This is a unique Labor Operation for Bulletin use only. Labor Operations diagnostics for this issue are included
in engine oil pump failure screening test and data *If labor operation 4087388 is used, ADD TIME Not Allowed

Version History
Version

1

Modi ed

06/10/2020 - Created on.

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