Bulletin No.: 24-NA-021

Service Bulletin

Date: August, 2024

INFORMATION
Subject:

Information on Malfunction Indicator Lamp (MIL) Illuminated with Any
Combination of DTCs P0521, P06DD and/or P06DE Setting

This Service Bulletin replaces PIP5932D. Please discard all versions of PIP5932.

Brand:

Model:

Model Year:
from

Buick

Chevrolet

Encore GX

2023

Envista

2024

Trailblazer
(VIN M)

2023

Trax

2024

VIN:

Engine:

to

from

to

2024

—

—

1.2L Turbo
(LIH)

Transmission
:

—

Involved Region or Country

North America

Condition

Some customers may comment that the MIL is illuminated.
Technicians may find one or more of the following DTCs set in the Engine Control Module
(ECM):
• P0521
• P06DD
• P06DE
This condition may be caused by the one or more of the following:
• Engine wiring harness issue

Cause

• Oil pump debris
Information

Confirm DTC P0521, P06DD and/or P06DE are set in the ECM, the engine oil level is
correct, and no driveability concerns exist. Inspection of the oil pressure control solenoid
valve and the oil pressure sensor are required if the codes noted have been set. Refer to
Testing and Inspection.

Important: Service agents must comply with all International, Federal, State, Provincial, and/or Local laws
applicable to the activities it performs under this bulletin, including but not limited to handling, deploying,
preparing, classifying, packaging, marking, labeling, and shipping dangerous goods. In the event of a
conflict between the procedures set forth in this bulletin and the laws that apply to your dealership, you
must follow those applicable laws.

Inspection and Testing of Oil Pressure Sensor
1. Remove the engine oil pressure control solenoid valve electrical connector and inspect for proper terminal
tensions, crimps, and locks.
2. Test for 10 to 30 Ω between the test points.
− Control terminal 2/B & Ignition terminal 1/A of the engine oil pressure control solenoid valve.
3. If within range, inspect the solenoid valve for signs of debris.
⇒

If no debris are found and the concern is not isolated to the engine oil pressure control solenoid valve, refer
to Engine Oil Pressure Sensor Replacement in SI to inspect the engine oil pressure sensor.

Copyright 2024 General Motors. All Rights Reserved.

Page 2

August, 2024

Bulletin No.: 24-NA-021

4. Disconnect the engine oil pressure sensor and test for less than 10 Ω between the low reference circuit 580
terminal 2 and ECM connector X1-terminal 23.

6374708

• If the resistance is within range, tap and manipulate the engine wiring harness between the oil pressure
sensor (1) and X125 (2), while monitoring for a change in the resistance reading.
• If the concern is not isolated to the engine wiring harness, reinstall all components and perform the Engine Oil
Pump Screening Test.

Engine Oil Pump Screening Test
Important: The purpose of this procedure is to perform two tests of ten cycles each, as described below, or to
trigger DTCs P0521, P06DD, P06DE, whichever comes first.
Note: The test should be stopped immediately upon triggering a listed DTC.
1. Park the vehicle in a safe location. Put the transmission in Park and apply the parking brake.
2. Connect the MDI or MDI2 and start GDS.
⇒

Clear all codes in the vehicle, and double check that there are no codes in the ECM before starting the
procedure.

3. Module Diagnostics => [K20] Engine Control Module => Data Display => Engine Mechanical Data

Bulletin No.: 24-NA-021

August, 2024

Page 3

6379891

4. Start and run engine for minimum 15 minutes until the coolant temperature gauge needle is centered in the
gauge.
5. Raise the engine speed to 2,000 rpm for 30 seconds.
6. Raise the engine speed to 4,000 rpm for 15 seconds.
7. Release the accelerator pedal and idle 15 seconds.
8. Repeat the 2000 rpm, 4000 rpm, and idle test cycle ten times.
9. Check DTC Display Tab for trouble codes P0521, P06DD, P06DE. Exit Engine Mechanical Data screen to save
session log.
• If any of these DTCs set: P0521, P06DD, P06DE, refer to Oil Pump Replacement in SI.
• If P0521, P06DE, P06DD are not present, turn off the engine, and proceed to step 10.
10. Disconnect scan tool from DLC. Remove key fobs from vehicle. Open door and close door. Wait for 30 seconds
to allow modules to power down.
11. Leaving engine off, enter service mode, connect GDS2 and enter Engine Mechanical Data.
12. Start engine. Repeat the test cycle ten more times.
13. Check DTC Display Tab for trouble codes P0521, P06DD, P06DE. Exit Engine Mechanical Data screen to save
session log.
• If any of these DTCs set: P0521, P06DD, P06DE, during this test, refer to Oil Pump Replacement in SI.
• If P0521, P06DD, P06DE are not set during this test, no further action is required. Release the vehicle to the
customer.

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August, 2024

Bulletin No.: 24-NA-021

6379894

Caution: If oil pump replacement is needed, ensure the three oil pump oil holes (Area 1) and OCV mounting hole
(Area 2) are free of debris BEFORE installing the oil pump and OCV. If debris is found, remove with a lint-free cloth
or brush that will not scratch the surface.
Caution: When installing the engine oil pan on the 1.2L (RPO LIH) engine, proper placement of the room temperature vulcanizing (RTV) sealant is critical. Refer to PIP5739 for RTV sealant instructions. Carefully follow the instructions in SI and PIP5739 to ensure proper oil pan installation.

Parts Information
Note: Only select the parts that coincide with the repair performed. Replace the part with the P/N outlined in the
Electronic Parts Catalog (EPC) in accordance with the vehicle VIN.
Causal
Part

Description

Part
Number

Qty

X

PUMP, OIL

55503981

1

N/A

PAN, LWR OIL

25204203

1

N/A

SEAL, O/PMP
FLOW CONT
VLV

55502517

1

N/A

FILTER, OIL

25206966

1

N/A

OIL

Refer to EPC

As Required

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

Description

Labor Time

4086708*

Inspection and Testing of Oil Pressure Sensor

0.8 hr

Add

Engine Oil Pump Screening Test

1.3 hrs

*This is a unique Labor Operation for bulletin use only.

Bulletin No.: 24-NA-021

August, 2024

Page 5

Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation

Description

Labor Time

4022600

Engine Oil Pressure
Sensor Replacement

4066070

Oil Pump Replacement

Use
Published
Labor
Operation
Time

Version

3

Modified

Released June 05, 2024
Revised July 16, 2024 – Updated/Added information throughout the bulletin.
Revised August 26, 2024 – Updated the Bulletin Only Labor Operation Number.

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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