Bulletin No.: PIP5666C
Published date: 01/10/2020

Preliminary Information
PIP5666C 4.2L (RPO LTA) Engine Exchange Program
Models
Brand:
Cadillac

Model:
CT6

VIN:

Model Years:
2019 - 2020

from
All

Involved Region or
Country

North America

Condition

Engine Exchange

Cause

New Product Monitoring

to
All

Engine:
4.2L (LTA)

Transmissions:
All

This PI will cover the Engine Exchange Program onlyfor the 2019-2020 model listed above.

Additional PIs will be published for each engineor component as they are introduced.
During the launch of the 2019-2020 model years, the following engine will be under an exchange
program:
4.2L Engine Assembly (RPO L
TA)
Product teams continually seek valuable information for engineering improvements.
To assist in this effort, an engine exchange program will be used for the listed engine and vehicles.
The 2019 model year engine exchange program will be administered by the GM Product Quality
Center (PQC).

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.
Note: (Do Not clear any DTCs prior to contacting the PQC).

Guidelines for honoring exchange requests underthis 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.

Division

PQC Telephone Number

US Cars and Trucks
1-866-654-7654
Canada -- English and French

Components that may be removed and serviced without exchange are identified by an "X" in the
appropriate column of the table below
.
Any repairs involving engine components not identified in the table below
, engine noise concerns,
oil consumption, or relatedsymptoms 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 notified by the PQC consultant if additional items are considered serviceable on a
particular engine.

Serviceable Components

4.2L (LTA)

A/C Compressor

X

Accessory Drive

X

Air Inlet Adapter

X

Bleed Air Pipe

X

Brackets

X

Camshaft Cover

X

Coils

X

Coolant Feed Hose

X

Coolant Feed Pipe

X

Coolant Pump

X

Coolant Return Pipe

X

Cooling System

X

Cover Dowels, Seals and Insulators

X

Crank Sensor Heat Shield

X

Crankshaft Balancer

X

Crankshaft Sensor

X

Emission Canister Purge Tube Assembly

X

Engine Control Module

X

Engine Cover / Beauty Cover

X

Engine Wiring Harness

X

Flywheel / Flex Plate

X

Foul Air Pipes

X

Fresh Air Pipes

X

Fuel Feed Intermediate Pipe

X

Fuel Feed Pipe

X

Fuel System

X

Heat Shield

X

High Pressure Fuel Pump

X

Ignition System

X

Injector Wiring Harness

X

Injectors

X

Intake Air Temperature & Pressure Sensor

X

Knock Sensors

X

Lower Intake Manifold

X

Lower Oil Pan

X

Manifold Absolute Pressure Sensor (MAP)

X

Mass Air Flow Sensors

X

Oil

X

Oil Cooler

X

Oil Feed Pipe

X

Oil Fill Cap

X

Oil Filter

X

Oil Filter Adapter

X

Oil Level Indicator (Dipstick)

X

Oil Level Switch

X

Oil Pressure Switch

X

Oil Return Pipe

X

Oxygen Sensors

X

PCV Check Valves

X

PCV System

X

PCV Tube fittings

X

Rail Assembly w / Injectors

X

Rail Assembly w/o Injectors

X

Rail Pressure Sensor

X

Sensors

X

Spark Plugs

X

Starter Motor and Solenoid

X

Thermostat

X

Thermostat Housing

X

Throttle Actuator Wire Assembly

X