22-NA-234

Bulletin No.:
Service Bulletin
Date:
22-NA-234
December, 2022
INFORMATION
Subject:
Brand:
Buick
Information on Malfunction Indicator Lamp (MIL) Illuminated - DTC P18EB and/or
P18E9 Set
Model Year:
Model:
from
Enclave
2022
Envision
2021
to
VIN:
from
to
Engine:
Transmission:
2023
Involved Region or Country
North America
Condition
Some customers may comment that the MIL is illuminated.
Some technicians may find one or more of the following DTCs set:
• P18E9: Transmission Range Selector Switch 1-2-3 Stuck On
• P18EB: Transmission Range Selector Switch 7-8-9 Stuck On
Cause
This condition may be caused by liquid spill/debris on ETRS shifter or actual concern with
the ETRS shifter.
If there is evidence of liquid spill/debris and ETRS Shifter buttons are stuck and not
functioning correctly:
– Service technician will replace the shifter and advise customer about spilling liquid on
the shifter buttons. This is not a defect in materials or workmanship and should be
handled accordingly.
If there is evidence of liquid spill/debris and ETRS shifter buttons are not stuck but are
functional.
– The service technician will clean affected area with dry cloth and try to duplicate the
failure.
Information
If the vehicle/shifter is performing as expected:
– No shifter replacement is required.
– Advise customer about spilling liquid on the shifter buttons.
In case there is no evidence of liquid spill/debris:
⇒ Service technician will clear the code.
⇒ Test drive the vehicle trying to duplicate the issue
If vehicle/shifter is performing as expected, no shifter replacement is required.
If the customer comes second time for the same issue:
– Service technician will inspect the vehicle for liquid spill/debris.
• if none found, service technician will replace the shifter.
• If liquid spill/debris are found, refer to the initial diagnostics stated above.
Version
1
Modified
Released November 28, 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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