Malfunction Indicator Lamp (MIL) Illuminated – DTCs P0521 and/or P06DD Set – 2020 Chevrolet Corvette

SEOCONTENT-START

Copyright 2020 General Motors LLC. All Rights Reserved.
Service Bulletin Bulletin No.: 20-NA-179
Date: October, 2020
TECHNICAL
Subject: Malfunction Indicator Lamp (MIL) Illuminated – DTCs P0521 and/or P06DD Set
Brand: Model:
Model Year: VIN Breakpoint:
Engine: Transmission:
from to from to
Chevrolet Corvette 2020 2020 SORP September
10, 2020 6.2L (LT2) —
Involved Region or Country North America
Condition
Some customers may comment that the MIL is illuminated.
Some customers may also comment that the MIL will illuminate and then shut off.
Some technicians may find one or more of the following DTCs set in the Engine Control
Module (ECM):
• P0521: Engine Oil Pressure Sensor Performance
• P06DD: Engine Oil Pressure Control Valve Performance
Cause This condition may be caused by an unseated engine oil pressure control valve (OCV).
Correction
5633411
Note: If a vehicle comes in with one of these DTCs, follow SI for both DTCs to ensure
there is not an electrical fault or other hardware concern. After diagnosis has been
performed and no issues are found electrically, then it will be necessary to remove the
engine oil pan and inspect for a unseated engine oil pressure control valve, which is
mounted on the bottom of the engine oil pump.
If P0521 and P06DD DTCs are present, then a redesigned oil pressure control valve
retainer clip (1) may be necessary. Refer to the Service Procedure section below.
Page 2 October, 2020 Bulletin No.: 20-NA-179
Service Procedure
1. Remove the engine oil pan. Refer to Oil Pan
Replacement in SI.
5633412
Note: The generator may need to be repositioned to
gain access to the main cap side bolts.
2. Remove the main cap side bolts (1).
Important: When removing the main bearing cap be
careful not to damage the main bearing or journal
surface of the crankshaft. Please set the main bearing
cap in a safe place so no debris or damage could occur.
3. Remove and discard the bolts (2) that secure the
#1 main bearing cap.
5633444
4. Inspect the OCV:
• If you find this oil pressure control valve
dislodged (1), it will be necessary to install a
redesigned oil control valve retainer.
5. Disconnect the oil pressure control valve electrical
connector and position aside.
Bulletin No.: 20-NA-179 October, 2020 Page 3
5633443
Note: Remove the existing oil pressure control valve
retainer by pulling towards the rear and discard. You
will be installing a newly designed retainer during
installation.
6. Push in the retainer and remove the oil pressure
control valve and set aside.
7. Once the retainer is removed, inspect the oil
pressure control valve for any signs of damage and
ensure the O-ring is not cut.
⇒ Apply a small amount of clean engine oil to the
pressure control valve and reinstall ensuring it
is seated correctly.
5633451
Important: Do not use any tools to tap the pressure
control valve into place. Only install the pressure
control valve by pushing on the body of the valve
by hand.
8. Install the new retainer from the front of engine
towards the rear as shown in the graphic above.
5633895
9. When the retainer is installed, there should be
about 2 to 3 mm of clearance between the retainer
and the oil pump body as shown above.
⇒ Ensure the pressure control valve and retainer
are correctly installed.
10. Ensure the cap and bearing are VERY CLEAN and
apply assembly lube prior to installation.
11. Install the front main bearing cap with new bolts.
Tighten
Tighten the bolts to specifications. Refer to
Fastener Specifications in SI.
12. If removed, install the generator.
13. Install the engine oil pan. Refer to Oil Pan
Replacement in SI.
Page 4 October, 2020 Bulletin No.: 20-NA-179
Parts Information
Important: **The Oil Pump Control Valve (OCV)
Retainer can be obtained from the Warranty Parts
Center (WPC) using the TSP Dealer Request Form
located on Global Connect<Service
Department<Service Forms Application<General
Information tab<TSP Dealer Request Form.
Instructions for submitting are on the form. Request
WPC857.
Causal
Part
Description Part
Number
Qty
X
RETAINER, O/
PMP FLOW
CONT SOL VLV
Request
WPC857** 1
N/A
BOLT, RR
CRADLE BR
(M14X2X105)
11561495 2
N/A
BOLT, RR
CRADLE BR
(M10X1.5X115)
11547752 4
N/A
BOLT, RR SUSP
CRADLE FRT
(M14x99.21)
11602517 2
N/A
SEAL, OIL PAN
HIGH
PRESS PORT
12621086 4
N/A
GASKET, OIL
PAN (SMALL
GASKET)
55577121 1
N/A Seal, OIL
PAN FRT 12695698 1
N/A BOLT, CR/
SHF BALR 11548720 1
N/A
BOLT, CR/SHF
BRG CAP
(M10X2X96)
11548076 2
N/A
BOLT, CR/SHF
BRG CAP
(M10X2X82)
11548075 2
N/A
BOLT, CR/SHF
BRG CAP
(M8X1.25X25)
11546565 2
N/A Oil, Engine Refer
to EPC Refer to SI
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
4087538* OCV Retainer Clip
Replacement
10.7 hrs
*This is a unique Labor Operation for bulletin use only.
Version 1
Modified Released October 23, 2020
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.
WE SUPPORT VOLUNTARY
TECHNICIAN
CERTIFICATION

SEOCONTENT-END