Bulletin No.: 24-NA-021

Service Bulletin

Date: July, 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.
Some technicians may find one or more of the following DTCs set in the Engine Control
Module (ECM):
• P0521
• P06DD
• P06DE

Cause

This condition may be caused by the one or more of the following:
• Engine wiring harness issue
• 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.

− 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.

Inspection and Testing of Oil Pressure Sensor

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 X1terminal 23.

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.

Copyright 2024 General Motors. All Rights Reserved.

⇒

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.

Page 2

July, 2024

Bulletin No.: 24-NA-021

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

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.

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.

8. Repeat the 2000 rpm, 4000 rpm, and idle test
cycle ten times.

2. Connect the MDI or MDI2 and start GDS.

• 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.

⇒

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

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.

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.

Bulletin No.: 24-NA-021

July, 2024

Page 3

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.

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 lintfree 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

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

4088458*

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.

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

2

Modified

Released June 05, 2024
Revised July 16, 2024 – Updated/Added information throughout the bulletin.

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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