Bulletin No.: PIP5493G
Published date: 08/9/2018

Preliminary Information
PIP5493G Mis re with DTC’s P0300, P0301-P0306
Models
Brand:

Model:

Model Years:

VIN:
from

Engine:

to

Transmissions:

Buick

LaCrosse

2017 - 2019

All

All

3.6 LGX

All

Cadillac

ATS

2016 - 2019

All

All

3.6 LGX

All

Cadillac

CT6

2016 - 2019

All

All

3.0 LGW, 3.6 LGX

All

Cadillac

CTS

2016 - 2019

All

All

3.6 LGX

All

Cadillac

XT5

2017 - 2019

All

All

3.6 LGX

All

Chevrolet

Camaro

2016 - 2019

All

All

3.6 LGX

All

Chevrolet

Colorado

2017 - 2019

All

All

3.6 LGZ

All

GMC

Acadia

2017 - 2019

All

All

3.6 LGX

All

GMC

Canyon

2017 - 2019

All

All

3.6 LGZ

All

Supersession Statement
This PI was superseded to update model years. Please discard PIP5493F.
Involved Region or Country North America

Condition

Some customers may comment on a MIL light illuminated.
During diagnosis a technician may nd DTC P0300 (Engine Mis re Detected) and/or
a speci c cylinder DTC such as P0300, P0301-P0306
This code may be active or stored in history.

Cause

Multiple causes depending on vehicle con guration.

Correction:
On 2106 and 2017 vehicles, verify the vehicle has the latest ECM calibration.
NOTE: Do not re ash 2018 vehicles for this condition.
If a new calibration is available relating to this concern, reprogram the ECM and reevaluate the condition.
If code(s) do not return and no condition is present then return vehicle to customer.
If vehicle has the latest ECM calibration refer below for next steps.
1) Perform normal eSI diagnostics testing all spark and fuel components for issues. (Coil grounds and wiring,
injector concerns, spark plugs, etc)
If no concerns are found following ESI then follow this PI for repair.
2) Inspect for broken or dislodged SRFFs (rockers arms) per the pictures below.
While inspecting the rockers it will be necessary to rotate the engine over by hand to ensure that the rockers are

opening the valves.
NOTE: Camshaft carrier assembly removal may be necessary to fully inspect the rockers and SRFF's.
If any one of the SRFF’s are damaged it will be necessary to replace all four on the a ected cylinder.

3) Remove the camshaft actuators on the bank that is mis ring and inspect the end of the camshafts and the pin
in the actuators for being bent example shown below.

4) If any broken parts are found during inspection replace all damaged parts.
It will also be necessary to replace the AFM OCV in the camshaft cover for both banks.
5) If vehicle was built before November 1, 2017 replace the e ected exhaust shla's/ lifters on the cylinder that was
mis ring with current part # in EPC.
NOTE: This PI will be updated or changed to a bulletin when parts breakpoint dates become available.

Warranty Information
For vehicles repaired under warranty, use the current labor time for the actual repair made.

Version History
Version

8

Modi ed

Created on 04/24/2017
6/7/2017 Update to add Model Year in Correction.
6/29/2017 Update to add further direction with picture and correct engine
description.
8/02/2017 Update to add new directions and administrative details.
10/30/2017 update to add model year and directions and pictures.
1/17/2018 Update to change direction on Shla replacement and end
administrative details.

3/12/2018 Update to revise direction on calibration update.
8/7/2019 Update to add 2019 MY

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