PIT6044A

Bulletin No.: PIT6044A
Published date: N/A
Preliminary Information
PIT6044A Service High Voltage with MIL and/or DTCs
Models
Brand:
Model:
Model Years:
VIN:
from
to
Engine:
Transmissions:
BrightDrop
Zevo 600 eLCV
2023 - 2023
ALL
All
All
All
Cadillac
EV LYRIQ
2023 - 2024
ALL
All
All
All
Chevrolet
Blazer EV
2024 - 2024
ALL
All
All
All
Chevrolet
Silverado EV
2023 - 2023
ALL
All
All
All
GMC
HUMMER EV
2022 - 2023
ALL
All
All
All
GMC
HUMMER EV SUV
2024 - 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, 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. Please
inform the customer to accept any future OTA updates for their vehicle.
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 set as current or history.
2. 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.
3. Wait 15 mins, then reconnect the 12v following the Battery Negative Cable Disconnection and Connection
procedure outlined in Service Information.
4. 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.
5. 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.
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
Description
Labor Time
Hybrid/Electric Vehicle Battery Pack Communication
1.5 Hr.
Module manual reset
*This is a unique Labor Operation for Bulletin use only
Version History
Version
Modi ed
2
08/03/2023 - Created on.
08/09/2023 - Updated to include U2C11
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