Bulletin No.: PIP6081

Service Bulletin

Date: August, 2025

PRELIMINARY INFORMATION
Subject:

Brand:

MIL Illuminated and Service High Voltage Message Displayed on IPC CMU
Performance Brownout
Model:

Model Year:
from

VIN:
to

from

to

Engine:

Transmission:

BrightDrop

ZEVO 400

2023-2024

All

All

All

All

BrightDrop

ZEVO 600

2023-2024

All

All

All

All

Chevrolet

BrightDrop
400

2025-2026

All

All

All

All

Chevrolet

BrightDrop
600

2025-2026

All

All

All

All

Cadillac

Escalade IQ

2025-2026

All

All

All

All

Cadillac

Escalade IQL

2026

All

All

All

All

Chevrolet

Silverado EV
WT

2024-2026

All

All

All

All

Chevrolet

Silverado EV
RST

2024-2026

All

All

All

All

GMC

HUMMER EV

2022-2025

All

All

All

All

GMC

HUMMER
SUV EV

2024-2026

All

All

All

All

GMC

Sierra Denali
EV

2024-2026

All

All

All

All

Involved Region or Country

North America

Condition

A MIL (Malfunction Indicator Lamp) may illuminate, or a "Service High Voltage" message
may appear on the IPC (Instrument Panel Cluster). Additionally, the 12V battery may
discharge.

Cause

A K16 BECM (Battery Energy Control Module) calibration anomaly causing the setting of
specific DTCs related to battery performance and communication.
More than one of the following DTCs may be set as HISTORY: P2C8A, P2C8B, U3577,
U3578, U3579, U357A, U357B, U357C, U357D, U357E, U357F, U3580, U3581, U3582,
U3583, U3584, U2BAA, U2BAB, U2BAC, U2BAD, U2BAE, U2BAF, U2BB0, U2BB1.

Correction
Note: Updated Software and Calibrations will be available in the form of an OTA update or Service Programming in
the future. Please inform the customer to accept any future OTA updates for their vehicle.
1. Verify the vehicle has more than one of the following DTCs set as HISTORY; P2C8A, P2C8B, U3577, U3578,
U3579, U357A, U357B, U357C, U357D, U357E, U357F, U3580, U3581, U3582, U3583, U3584, U2BAA, U2BAB,
U2BAC, U2BAD, U2BAE, U2BAF, U2BB0, U2BB1.
Note: If only 1 of the subset of DTCs is set as history this bulletin is not applicable. Follow step 2 below, start a TAC
case, and reference this P.I
2. Perform SPS2 Hybrid/EV Battery Data Retrieval outlined in bulletin 25-NA-044.

Copyright 2025 General Motors. All Rights Reserved.

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August, 2025

Bulletin No.: PIP6081

3. Program the K16 Battery Energy Control Module (BECM) with the most recent software via SPS.
4. After programming the BECM, perform Manual Reset process twice.
Manual Reset Process:
1. Perform the Battery Negative Cable Disconnection and Connection procedure outlined in Service Information.
Warning: Always ensure the Battery Maintenance Mode is inactive before disconnecting the 12-volt battery.
This mode can be active with the ignition off, regardless of whether the vehicle charging cord is plugged in
or not. When this mode is active, the on-board high voltage battery charger will energize the 12-volt battery
cables and charge the 12-volt battery. Disconnecting the battery cables while this mode is active may
result in an electrical shock or a burn from hot battery cable leads.
2. Wait 15 mins, then reconnect the 12v following the Battery Negative Cable Disconnection and Connection
procedure outlined in Service Information.
3. Place the vehicle in Propulsion "Ready" mode for 10 seconds, then turn the vehicle "OFF" and remove the
keyless transmitter from the vehicle and place the transmitter in a safe location approximately 10 ft or more away
from the vehicle. Wait 15 mins.
4. Repeat Manual Reset Process steps 1-3 a total of 2 times.
5. Charge and test the 12V battery.
6. Place the vehicle in Service mode, clear DTCs with GDS2.
7. If any of the following DTCs: P2C8A, P2C8B, U3577, U3578, U3579, U357A, U357B, U357C, U357D, U357E,
U357F, U3580, U3581, U3582, U3583, U3584, U2BAA, U2BAB, U2BAC, U2BAD, U2BAE, U2BAF, U2BB0, U2BB1
return, start a TAC case, and reference this P.I.
CMU Performance DTC Run Criteria:
1. Place the vehicle in Propulsion "Ready" mode for 10 mins.
2. Shift to Drive and back to park.
3. Turn the vehicle "OFF" and remove the keyless transmitter from the vehicle and place the transmitter in a safe
location approximately 10 ft or more away from the vehicle.
4. Place the vehicle in Propulsion "Ready" mode for 10 mins.
5. Verify DTCs have not reset with GDS2
6. If any DTCs return, perform SPS2 Hybrid/EV Battery Data Retrieval outlined in bulletin 25-NA-044, start a TAC
case, and reference this P.I

Warranty Information
For vehicles repaired under the Powertrain coverage, use the following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH) for coverage information.
Labor
Operation
5080088

Description

Labor Time

Hybrid/Electric Battery
CMU Performance
Brownout Manual Reset

3.0 Hrs.

*This is a unique Labor Operation for Bulletin use only.

Version

1

Modified

08/21/2025 Created on.

Bulletin No.: PIP6081

August, 2025

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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