PIT6129

Bulletin No.: PIT6129
Published date: N/A
Preliminary Information
PIT6129 Service High Voltage Message with MIL and/or DTCs
U2BF2, U2BF3, and/or U2BF6
Models
Brand:
Model:
Model Years:
VIN:
from
to
Engine:
Transmissions:
Chevrolet
Silverado EV
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
Customers may report that the Malfunction Indicator Lamp (MIL) is illuminated, or a
"Service High Voltage" message is displayed on the Instrument Panel Cluster (IPC).
Additionally, the vehicle may operate in a reduced power mode.
A technician may nd any of the following DTCs U2BF2, U2BF3, and/or U2BF6 set as
current or history.
Cause
H2 Sensor Calibrations
Correction:
1. With the vehicle in Service mode, use GDS2, verify if the vehicle has one or more of the following DTCs;
U2BF2, U2BF3, and/or U2BF6 set as current or history.
2. Program the K16 Battery Energy Control Module (BECM) with the most recent software via SPS.
3. Following programming, perform a DTC Code Clear.
4. Place the vehicle in Service mode and verify no DTCs have returned.
5. If any of the following DTCs: U2BF2, U2BF3, and/or U2BF6 return, start a TAC case, and reference this P.I.
– Please have ready current session log including "Vehicle DTC and ID information.” This will be asked for
once TAC Case has been set.
Warranty Information
For vehicles repaired under the Powertrain coverage, use the following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH) for coverage information.
Labor Operation
2887448
Description
Labor Time
U2BF2, U2BF2, U2BF3, U2BF6 K16 BECM Programming
.05 Hr.
*This is a unique Labor Operation for Bulletin use only.
Version History
Version
Modi ed
1
03/01/2024 - Created on.
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