PIT6044

Bulletin No.: PIT6044
Published date: N/A
Preliminary Information
PIT6044 Service High Voltage with MIL and/or DTCs
Models
Brand:
Model:
Model Years:
VIN:
from
to
Engine:
Transmissions:
BrightDrop
EV 600 eLCV
2023
ALL
All
All
All
Cadillac
EV LYRIQ
2023
ALL
All
All
All
Chevrolet
Blazer EV
2023
ALL
All
All
All
Chevrolet
Silverado EV
2023
ALL
All
All
All
GMC
HUMMER EV
2023
ALL
All
All
All
GMC
HUMMER EV SUV
2023
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 find 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 set as current or history.
Cause
A potential software anomaly may be present that will be fixed 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 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.
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 10ft 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, 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
CMU Loss of Communication Manual Reset
1.5 Hr.
*This is a unique Labor Operation for Bulletin use only
Version History
Version
Modi ed
1
08/03/2023 - Created on.
© 2023 General Motors. All Rights Reserved.