Bulletin No.: PIT6044D
Published date: N/A

Preliminary Information
PIT6044D Service High Voltage with MIL and/or DTCs
Models
Brand:

Model:

Model Years:

VIN:
from

to

Engine:

Transmissions:

BrightDrop

Zevo 600 eLCV

2023

ALL

All

All

All

Cadillac

EV LYRIQ

2023 - 2024

ALL

All

All

All

GMC

HUMMER EV

2022 - 2024

ALL

All

All

All

GMC

HUMMER EV SUV

2024

ALL

All

All

All

Involved Region or Country North America

Condition

Some customers may comment the MIL is illuminated or Service High Voltage
Message displayed on the IPC.
A technician may nd any of the following DTCs; U2220, U2221, U2222, U2223,
U2224, U2225, U2226, U2227, U2228, U2229, U222A, U222B, U222C, U222D, U222E,
U222F, U2230, U2231, U2232, U2233, U2234, U2235, U2236, U2237, and/or U2C11
set as current or history.

Cause

A potential software anomaly may be present that will be xed in a future OTA
update.

Correction:
Note: Updated Software and Calibrations will be released at a later date in the form of an OTA update or Service
programming. Please inform the customer to accept any future OTA updates for their vehicle.
This PI is not applicable if the following software and calibration P/N(s) are currently in the vehicle.
K16 BECM - Identi cation Information.

2023 LYRIQ

pAWD:
Application Software Part Number 1: 24058918
Calibration Part Number 1: 24060149
RWD:
Application Software Part Number 1: 24058917
Calibration Part Number 1: 24060146

2024 LYRIQ

This PI is not applicable if the following software and calibration P/N(s) are currently in the vehicle.
K16 BECM - Identi cation Information.
Application Software Part Number 1: 24058918
Calibration Part Number 1: 24059907, 24059908, 24059909, 2405910 24059912, or 24059913

2024
This PI is not applicable if the following software and calibration P/N(s) are currently in the vehicle.
HUMMER EV
K16 BECM – Identi cation Information.
& SUV
Application Software Part Number 1: 24060536

Calibration Part Number 1: 24060941, 24060942, 24060943, 24060944, 24060945, 24060946,
24060947, 24060948, 24060949, 24060950, 24060951, 24060952, 24060953, or 24060954
This PI is not applicable if the following software and calibration P/N(s) are currently in the vehicle.
K16 BECM – Identi cation Information.

2023
HUMMER EV Application Software Part Number 1: 24060266

Calibration Part Number 1: 24060629, 24060632, 24060633, or 24060634
2023
BrightDrop
Zevo 600

This PI is not applicable if the following software and calibration P/N(s) are currently in the vehicle.
K16 BECM – Identi cation Information.
Application Software Part Number 1: 24056969
Calibration Part Number 1: 24060635

1. Verify the vehicle has one or more of the following DTCs set; U2220, U2221, U2222, U2223, U2224, U2225,
U2226, U2227, U2228, U2229, U222A, U222B, U222C, U222D, U222E, U222F, U2230, U2231, U2232, U2233,
U2234, U2235, U2236, U2237 and/or U2C11 set as current or history.
Note: If all Loss of Communication DTCs are set U2220-U2237 as current or history (depending on vehicle
application), do not continue with the procedure. Please start a TAC case and reference this P.I.
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 o , 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, then turn the vehicle "OFF" and remove the keyless transmitter
from the vehicle and place the transmitter in a safe location approximately 10 ft away. Wait 15 mins. Perform this
two times.
4. Place the vehicle in Service mode and use GDS2 and clear all DTCs.
If any of the following DTCs: U2220, U2221, U2222, U2223, U2224, U2225, U2226, U2227, U2228, U2229, U222A,
U222B, U222C, U222D, U222E, U222F U2230, U2231, U2232, U2233, U2234, U2235, U2236, U2C11 and/or U2237
return, start a TAC case, and reference this P.I.

MY23-24 Cadillac LYRIQ
1. After completing steps 1-5 above, program the K16 BECM (Battery Energy Control Module) as outlined in
Service Information.
2. After programming the BECM, perform the Battery Negative Cable Disconnection and Connection
procedure outlined in Service Information / steps 2 & 3 above 1 time.
3. Verify no DTCs are set.

MY23 BrightDrop Zevo 600
1. After completing steps 1-5 above, program the K16 BECM (Battery Energy Control Module) as outlined in
Service Information.
2. After programming the BECM, perform the Battery Negative Cable Disconnection and Connection
procedure outlined in Service Information / steps 2 & 3 above 1 time.
3. Verify no DTCs are set.

Warranty Information
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following
labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage
information.
Labor Operation
5080388
Add Time (as Required)

Description
Hybrid/Electric Vehicle Battery Pack Communication
Module manual reset
K16 Battery Energy Control Module Program

Labor Time
1.5 Hr.
0.4 Hr.

Labor Operation

Description
Labor Time
*This is a unique Labor Operation for Bulletin use only

Version History
Version

Modi ed

5
08/03/2023 - Created on.
08/09/2023 - Updated to include U2C11
09/01/2023 - Updated to add more information for the LYRIQ
09/05/2023 - Update more programming numbers for 2024 LYRIQ
10/26/2023 - Update information for BrightDrop and HUMMER EV

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