File in Section:

Service Bulletin

-

Bulletin No.:

16-NA-131

Date:

May, 2016

INFORMATION
Subject:

Information on Vehicles Designed to Operate on Gaseous Fuels

Brand:

Model:

Cadillac
Chevrolet
GMC

All GM
Passenger
Cars and
Light Duty
Trucks

Model Year:

VIN:

from

to

2011

2016

GM Dedicated CNG/LPG Upfitted
Vehicles
Starting in 2011 model year, GM Dedicated CNG
Vehicles (single-invoice) are designed and equipped
with the appropriate gaseous fuel storage and handling
gaseous fuel subsystems installed by GM as part of the
overall 6.0L Vortec Gaseous Powertrain system in full
size cargo vans. All other GM powertrains like Ethanol
E85 capable engines do not have the necessary
internal hardened component enhancements required
to operate on CNG/LPG and therefore cannot be
"upfitted" with Non-GM equipment.
As a reminder, GM does not endorse or authorize any
End Products made by other Manufacturers, nor any
non-GM work performed on new vehicles (by Dealers/
Manufacturers/Upfitters, including those with a valid
Special Vehicle Manufacturer's Agreement) other than
warranty work or recall campaigns authorized by GM.
This is true for new vehicles on which further work
(incomplete manufacturing) is to be performed, or a
new vehicle that is "altered" between the time it is
certified as a completed vehicle by GM, and the time
that it is delivered to the first retail, fleet, or commercial
customer.
Any changes to the GM Powertrain Fuel, or Emission
Systems that involve modifications, conversions, or the
addition of non-GM approved products will VOID the
GM Powertrain Limited Warranty including, but not
limited to the repair of engine, sensors (02), wiring,
control modules, emissions, exhaust system, catalytic
converter, and any other components and/or control
systems which fail because of the modification or
conversion. GM will not be responsible for costs
associated with the repair of these vehicles due to
failure of the aftermarket installed components or
failures of related vehicle systems induced by these
non-GM approved products. According to the Dealer
Sales and Service Agreement (Article 5.1.1)

Copyright 2016 General Motors LLC. All Rights Reserved.

from

Engine:

Transmission:

CNG/LPG
Engines Only

All

to

"If dealer modifies or sells a modified new motor
vehicle, or installs any equipment, accessory, recycled
part or part not supplied by General Motors, or sells any
non-General Motors service contract for a motor
vehicle, dealer will disclose this fact on the purchase
order and bill of sale, indicating that the modification,
equipment, accessory or part is not warranted by
General Motors or, in the case of a service contract, the
coverage is not provided by General Motors or an
affiliate."
The dealer is required to disclose to the customer any
modifications made, or parts and/or accessories
installed on the vehicle that are not GM approved, any
dealer services not recommended by GM, as well as
any Non-GM service contract. To comply with these
obligations, the dealer can locally reproduce the form
provided in this bulletin to properly disclose any of the
above situations. This disclosure form must be
presented to the customer during the sales or service
process, signed, and a copy must be kept in the
customer's sale and service file along with copies of the
purchase order and bill of sale.
In those cases where the vehicle modifications,
non-GM parts and/or accessories are warranted by the
installer, manufacturer, or upfitter, a copy of the third
party warranty must be presented to the customer at
the time of vehicle sale or with the invoice or repair
order.
Please refer to Customer Assistance, Training, Tools
and TAC Policy Manual, Article 4.1.1 for additional
information, or contact your regional GM Sales
representative.
All non-GM parts and technical assistance for repairing
alternative fuel system not installed by GM are only
available through the conversion/upfitter company.

Page 2
Version

May, 2016

Bulletin No.: 16-NA-131

1

Modified

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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