PIT6044D Service Bulletin/Repair Instructions

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
© 2023 General Motors. All Rights Reserved.

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