21-NA-148

Bulletin No.:
Service Bulletin
21-NA-148
Date:
August, 2023
TECHNICAL
Subject:
Brand:
Diagnostic Aid – DTC P2797, P2798 or P0C2D for Transmission Fluid Pump
Performance
Model:
Bolt EV
Chevrolet
Bolt EUV
Model Year:
from
VIN:
to
from
to
2023
—
—
Engine:
Transmission:
EN0
1ET25
Automatic
(MMF)
2021
2022
Involved Region or Country
Additional Options (RPOs)
Condition
Copyright 2023 General Motors LLC. All Rights Reserved.
North America
Equipped with RPO HPB — ELECTRIFIED PROPULS-ELECTRIC, BEV, GEN 2, FWD
Some customers may comment that they noticed a Propulsion Power is Reduced
message on the Driver Information Center (DIC) combined with a Service Vehicle
Soon MIL.
Page 2
August, 2023
Bulletin No.: 21-NA-148
5867264
Cause
5867265
A part quality spill has been identified with the low voltage electric transmission fluid
pump attached to the driver side of the transmission. A soldering process was out of
specification like the illustration above.
Note: The pump motor is not internally serviceable and the pictures provided are only for
helping to visually show the issue.
Correction
Replace the transmission fluid pump.
Important: The pump motor is not internally serviceable.
Bulletin No.: 21-NA-148
August, 2023
Page 3
Service Procedure
If you encounter a vehicle with the above concern,
replace the transmission fluid pump. Refer to
Transmission Fluid Pump Replacement in SI.
Parts Information
Causal
Part
Description
Part
Number
Qty
X
Transmission
Fluid Pump
25200558
1
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation
Description
Labor Time
8463470
Transmission Fluid Pump
Replacement
Use
Published
Labor
Operation
Time
Version
2
Modified
Released July 13, 2021
Revised July 28, 2023 – Added the 2023 Model Year.
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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