Bulletin No.: PIP5906A
Published date: 10/13/2023

Preliminary Information
PIP5906A 2024 6.6L Diesel Engine (L5P) Engine Exchange Program
Models
Brand:

Model:

Model Years:

VIN:
from

to

Engine:

Transmissions:

Chevrolet

Silverado 2500 / 3500

2024

All

All

6.6 L5P

All

GMC

Sierra 2500 / 3500

2024

All

All

6.6 L5P

All

Involved Region or Country:
Condition:
Cause:

North America
Engine Exchange
New product monitoring

This PI will cover the engine exchange program only for the 2024 model listed above.
Additional PIs will be published for each engine or component as they are introduced.
During the launch of the 2024 model year, the following engine will be under an exchange program:

6.6L Diesel Engine (L5P)
Product teams continually seek valuable information for engineering improvements.
To assist in this e ort, an engine exchange program will be used for the listed engine and vehicles.
The 2024 model year engine exchange program will be administered by the GM Product Quality Center (PQC).
Dealerships are required to contact the PQC, not GM Technical Assistance (TAC), to request an exchange.
Prior to contacting the PQC, please make sure to complete the "OEM Engine Exchange" template in this PI.
Use of the templates will minimize the time spent on the telephone and avoid the need of a second call to the
PQC.
Guidelines for honoring exchange requests under this program are being strictly enforced.
The PQC may refer the dealer technician to TAC if additional diagnosis is required.
TAC will be available for product inquiries that do not require assembly replacement.

Please have the part number available prior to contacting the PQC/TAC.

U.S Dealers:
Please contact the Product Quality Center (PQC) by opening a new case via Dealer Case Management (DCM).
From the DCM home page, click on “New PQC Case” found on the Technical Assistance tab.
Then in Global Connect, click on the Support/Chat tab, TAC-PQC Tab, PQC - Parts Restrictions Templates to
download the appropriate PQC - Parts Restrictions Template and save a copy to your computer.
You can attach a copy of the template to your PQC Case.

Dealers in Canada :
If your diagnosis leads to a possible part replacement, please contact the PQC by email at [email protected] or by
calling 1-866-654-7654 to receive the PQC -Parts Restriction Template then, return the completed Parts Restriction
Questions for engineering review.

Components that may be removed and serviced without exchange are identi ed by an "X" in the appropriate
column of the table below.
Any repairs involving engine components not identi ed in the table below, engine noise concerns, oil
consumption, or related symptoms may require an engine exchange.
Important: Engine block and internal components along with any component in which a cylinder head has to be
removed to perform the repair will require an engine exchange.
Please note that this list is subject to change as the program progresses.
You will be noti ed by the PQC consultant if additional items are considered serviceable on a particular engine.

Serviceable Components

6.6L Diesel Engine (L5P)

Accessory Drive

X

A/C Compressor

X

All Engine Sensors

X

All Cooling System Hoses

X

Brackets

X

Coolant Pump

X

Coolant System Bypass Pipe

X

Coolant System Radiator Inlet/Outlet Pipes

X

Coolant Outlet Assembly

X

Crankshaft Damper

X

DOC

X

EGR Valve

X

EGR Temperature Sensor

X

EGR Cooler Assembly

X

EGR Cooler Pipes

x

Engine Control Module (ECM)

X

Engine Mounts/Transaxle Mounts

X

Engine Wiring Harness

X

Engine Cover / Beauty Cover

X

Exhaust Temperature Sensors

X

Flywheel / Flex Plate

X

Fuel Injectors

X

Fuel Injector Wiring Harness

X

Fuel Rail

X

Fuel Pipes & HP Fuel Pump Assembly

X

Generator

X

Hi / Lo Pressure Fuel Lines

X

Heater Outlet / Inlet Fittings

X

Intake Air Ducts and related components

X

Intake Air Temperature Sensor

X

Upper Intake Manifold

X

MAP or Baro Sensor

X

Mass Air Flow Sensor

X

NOX Sensors

X

Oil Fill Cap

X

Oil Filter

X

Oil Level Indicator and Tube

X

Lower Oil Pan Gaskets

X

Oil Pressure Switch

X

PCV / CDR Hose(s)

X

PCV / CDR System

X

Starter Motor and Solenoid

X

Thermostat Housing/Gasket

X

Throttle Body/Related Components

X

Turbocharger Assembly

X

Note: The above service parts list of components may be requested through the normal GM Parts return process
for engineering evaluation for cause through the WPC parts return process.
Important: Engine repairs or failures that are caused by components external to the engine do NOT fall under the
exchange program. For example, if an engine failure is caused by incorrectly installed engine coolant lines, the
engine assembly (or parts required to complete a repair) must be obtained from General Motors Customer Care
and Aftersales (GMCC&A) through the normal parts ordering process. The exchange program is created as a way
to correct internal concerns and to take what is learned and nd a way to eliminate these concerns. External
components causing a failure do not provide any useful information in improving an engine. The engine received
from GMCC&A through the normal parts ordering process will be a new service engine.

Engine Broadcast Code Location
6.6L Diesel Engine (L5P): Engine Block Lower Right

The engine broadcast code can be found on the lower right of the engine block.

Procedures:
A thorough diagnosis must be performed on the condition in order to prevent unnecessary component
replacements.
Contact the Product Quality Center (PQC) to verify the proper diagnosis has been performed.
Upon review of the diagnosis, the PQC will establish a case reference number and make arrangements for
shipping an exchange unit to your dealership.
The replaced engine must be returned to the Warranty Parts Center (WPC).
DO NOT SHIP AN ENGINE TO THE (WPC) WITHOUT AN OFFICIAL WPC REQUEST.
Important: Failure to return the replaced engine by the due date will result in the dealership being debited the
entire warranty claim (parts and labor).
The removed unit must be returned complete in the original exchange shipping container.
For e ective engineering analysis, please do not remove any components.
Dress items on the removed unit must remain the same as the replacement engine (e.g., exhaust manifolds,
throttle body, etc.). Dealerships returning engines/components that have been even partially disassembled will be
judged as violating this procedure and, as such, will be billed for all materials furnished.
Notice: The exchange unit will be shipped with a quantity of oil; check oil level before starting the engine.

WPC Request:
The Warranty Parts Center (WPC) will send a Special Part Request to your dealership requesting the return of the
removed engine.
DO NOT wait for the warranty claim to be paid before returning the removed engine.
The Special Part Request will provide a request number.
This request number must be written on the outside of the return container using a permanent marker.

Failure to write the request number on the return container may delay the processing of your return.
If you do not receive the WPC Special Part Request, contact Julie Cumo at 248-371-9939 (for French call PQC 1866-654-7654) to obtain the proper paperwork in order to return the removed engine.
Failure to return the engine may result in a debit.

Shipping Preparation:
1. Remove the engine assembly/component as outlined in the applicable Service Manual.
2. Drain all uids from the removed engine.
3. Retorque any fasteners that were loosened or removed to the original torque speci cation.
4. Remove any plastic shipping plugs and covers from the exchange unit and install them on the removed unit.
5. If the concerned engine leaks, mark the area directly on the engine with a permanent marker.
6. Write the PQC case reference number on the repair order form.
7. Write the PQC case reference number directly on the component in a visible location.
8. Insert a copy of the WPC Special Part Request, repair order with technician comments, and the completed OEM
Engine Exchange Worksheet (template in this bulletin) into a plastic bag and securely fasten to the engine.
9. Place the removed engine into the original shipping container.

Shipping Instructions:
1. Write the WPC request number and the PQC case reference number on the outside of the container with a
permanent marker.
2. U.S. Dealers – Please go to www.gmwpc.com, click on the UPS emblem, enter your BAC and select “dealer
inquires.” Select “available forms” located on the left side of the screen in blue, then select “Central Transport
BOL.” A partially complete BOL will appear. Please print this Central Transport BOL and ll out “from” section with
your dealer information and complete the description elds.
Canadian Dealers – Refer to the latest version of Corporate Bulletin Number 99-00-89-019 for detailed shipping
information.
3. Contact the speci ed carrier to arrange for pick-up of the removed engine. If lift gate service is necessary,
please request it at the time of arranging pick-up service.
4. Have the driver sign the bill of lading. Retain a copy of the signed bill of lading. Attach your copy to the original
repair order. This will be your proof of returning the removed engine.
5. Ship all return exchanges/components Third Party Freight Collect with appropriate paperwork to:
GM Warranty Parts Center
45 Northpointe Drive
Orion, MI 48359

Parts Information
Description:

Part Number:

Quantity:

Engine

12732223

1

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

Descripton

Labor Time

4067490
Engine Replacement
Use Published Labor Operation Time
Add
Administrative Allowance
0.2 HR.
For engine exchange only: a $400.00 misc. net allowance for the engine can be claimed in the warranty
transaction

Version History
Version
Modi ed

2
3/24/2023 - Created.
10/12/2023 - Updated to add warranty information.

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