PIT5638B

Bulletin No.: PIT5638B
Published date: 03/14/2019
Preliminary Information
PIT5638B Service Brake Assist Message with DTC C0021, C058E
and/or C05B0
Product Investigation Review Required
Models
Brand:
Model:
Model Years:
VIN:
from
to
Engine:
Transmissions:
Chevrolet
Silverado 1500 (New Model)
2019
All
All
All
All
GMC
Sierra 1500 (New Model)
2019
All
All
All
All
Involved Region or Country North America
Condition
In some rare situations, a customer may comment on a "Service Brake Assist"
message and they may have a hard brake pedal or increased e ort is needed to
depress the brake pedal, which may extend stopping distances. When checking for
DTC's, a current or history C0021, C05B0, and/or C058E will be set in the K160 Brake
System Control Module (formerly known as the EBCM). When the EBCM DTCs are
set, it will request the SES MIL and the ECM will set DTC P25A2 (Brake System
Control Module Requested MIL Illumination).
Cause
This issue could be caused by an internal software calibration.
Correction:
Engineering has released updated Brake System Control Module calibrations to address this condition.
Reprogram the K160 Brake System Control Module with the latest calibrations currently available in Tis2Web, per
Service Update N192210460.
Important: Stable battery voltage is critical during programming. Any uctuation, spiking, over voltage or loss of
voltage will interrupt programming. Install the EL-49642 SPS Programming Support Tool to maintain system
voltage. If not available, connect a fully charged 12 V jumper or booster pack disconnected from the AC voltage
supply. DO NOT connect a battery charger.
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
9104166*
9104341*
Description
Brake System Control Module (BSCM) Reprogramming with SPS
Veri ed Module Software or Calibration Level: Module Programmed with
Same Level Software or Calibration.
Labor
Time
0.3hr
0.2hr
Trans.
Type
Net
Item
ZFAT
N/A
* To avoid warranty transaction rejections, the SPS Warranty Claim Code must be entered when submitting this
transaction. Note that if multiple modules are reprogrammed, all claim codes must be entered with a comma
separating each code.
Version History
Version History
Version
3
Modi ed
10/29/2018 - Created on
12/19/2018 - Supersedes to update the Title, Condition, Cause,
Recommendation, and Warranty Sections
3/14/2019 - Supersedes to update the Title, Condition, correction and
warranty sections.
© 2019 General Motors. All Rights Reserved.