Bulletin No.:
Service Bulletin
Date:
22-NA-036
February, 2022
INFORMATION
Subject:
Vehicle Odometer Not Matching Display after ECM, BCM or IPC Controller
Replacement
Brand:
Model:
Cadillac
CT6–V
Model Year:
VIN:
from
to
from
to
2019
2020
—
—
Engine:
Transmission:
4.2L (RPO LTA)
—
Involved Region or Country
North America, Middle East
Condition
The purpose of this bulletin is to inform dealership service personnel about a potential
odometer inaccuracy concern after an engine control module (ECM) or body control
module (BCM) is replaced and reprogrammed along with an instrument panel
cluster (IPC).
Cause
The cause of the condition may be if the BCM or ECM was replaced and reprogrammed
along with the IPC at the same time, the odometer value could read incorrectly since both
modules were new.
Correction
When replacing an ECM, BCM or IPC, it is IMPORTANT to only replace and reprogram
one module at a time with a power up sequence to establish odometer update across the
other modules. If you replace more than one module at the same time, you could risk the
odometer displaying incorrect miles after the programming event.
Refer to Service Programming System (SPS) in the Service Manual or the specific
module programming instructions in service information (SI) for proper programming
procedures.
Version
1
Modified
Released February 11, 2022
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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