22-NA-232

Bulletin No.:
Service Bulletin
Date:
22-NA-232
November, 2022
INFORMATION
Subject:
Brand:
Diagnostic Tip for 10 Speed Oil Pump Drive Gear
Model:
CT6
Cadillac
Model Year:
from
to
2019
2020
2021
2022
2019
2019
2020
2021
VIN:
from
to
Engine:
Transmission:
LM2, L84,
L87,
LSY, LGX
MHS, MHT,
MHW, MHX,
MI1, MI2, MI4,
MQA,
MQB, MQC
CT4
CT5
Escalade Models
Silverado 1500
(New Model)
Silverado LD
Silverado 1500
Chevrolet
Silverado 1500 LTD (RPO J21, VIN
Digit 5 = W/Y)
Silverado 1500 New (RPO J22,
VIN Digit 5 = A)
Suburban
Tahoe
GMC
2022
2022
2021
Sierra 1500 (New
Model)
2019
2019
Sierra Limited
2019
2019
Sierra 1500
2020
2021
2022
2022
2021
2022
Sierra 1500 Limited (RPO J21,
VIN Digit 5 = 8/9)
Sierra 1500 - New
(RPO J22, VIN
Digit 5 = H/U)
Yukon Models
Copyright 2022 General Motors LLC. All Rights Reserved.
Page 2
November, 2022
Bulletin No.: 22-NA-232
Involved Region or Country
North America
Condition
Some customers may comment that a whine, growl or grind noise from the vehicle.
– This noise may be present at idle and increase in intensity as engine RPM increases.
This condition typically presents itself at approximately 15,000 miles (24140 km) and
higher mileage.
Cause
This condition may be caused by the oil pump drive gears in the transmission.
Information
The noise may be present from the front of the transmission or rear of the engine:
1. Remove the transmission oil pan, valve body and transmission oil pump.
2. Inspect the oil pump driven gear on the oil pump for abnormal wear or tooth
damage.
3. Also inspect the transmission oil pump idler gear for abnormal wear, tooth damage
and side to side movement.
– If gear damage is found on both the driven and idler gear, the driven gear in the front
cover is damaged as well.
Note the side-to-side movement in the oil pump
idler gear.
Additional Information
6196005
6196003
Note the damage to the oil pump idler gear.
6196006
Note the damage to the oil pump driven gear.
Bulletin No.: 22-NA-232
November, 2022
Version
1
Modified
Released November 18, 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.
Page 3
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