NHTSA ID Number: 11007715
Manufacturer Communication Number: PIT6044K
TSB/Document Date: 2024-09-11
Summary
This Preliminary information communicates that a Software update is in the works and to disconnect the 12 volt battery to clear the codes.?
Bulletin No.: PIT6044K
Published date: 08/19/2024
Preliminary Information
PIT6044K Service High Voltage with MIL and/or DTCs
Models
Brand:
BrightDrop
Cadillac
Chevrolet
Chevrolet
Chevrolet
GMC
GMC
Model:
Model Years:
600
2023
EV LYRIQ
2023
Blazer EV
2024
Silverado EV
2024
Equinox EV
2024
HUMMER EV
2022
HUMMER EV SUV 2024
-
2025
2025
2025
2025
2025
2025
2025
VIN:
Engine: Transmissions:
from to
ALL All All
All
All
All All
All
All
All All
All
All
All All
All
All
All All
All
All
All All
All
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, and/or U2C11 set
as current or history.
Cause
A potential software anomaly may be present.
Correction:
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.
2. Program the K16 Battery Energy Control Module (BECM) with the most recent
software via SPS.
3. After programming the BECM, perform Manual Reset process twice.
Manual Reset Process:
A. 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.
B. Wait 15 mins, then reconnect the 12v following the Battery Negative Cable
Disconnection and Connection procedure outlined in Service Information.
C. Place the vehicle in Propulsion “Ready” mode for 10 seconds, (has power-steering)
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.
D. Repeat Manual Reset Process steps A-C a total of 2 times.
4. Place the vehicle in Service mode (No power-steering) then use GDS2 and clear all DTCs.
5. 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
Description
Labor Time
5080388
Hybrid/Electric Vehicle Battery Pack
Communication Module manual reset
1.5 Hr.
Add Time (as
Required)
K16 Battery Energy Control Module
Program
0.4 Hr.
*This is a unique Labor Operation for Bulletin use only
Version History
Version
10
Modified
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.
10/30/2023 - Updated correction.
12/01/2023 - Updated correction.
02/27/2023 - Updated correction.
04/24/2024 - Updated Models and years
07/29/2024 - Added Blazer EV and Silverado EV
08/19/2024 - updated model years
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TSB/Document ID: PIT6044K
Replacement Service Bulletin Number:
MFR Communication Date: 2024-09-11
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: UNKNOWN OR OTHER
MFR Component System:
MFR Component Subsystem:
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