NHTSA ID Number: 10168970
Manufacturer Communication Number: PIT5695B
TSB/Document Date: 2019-12-09
Summary
This Preliminary information communicates an issue where the brake pad monitor life % counts down to quickly. Engineering released new Brake System Control Module Software to correct this issue and dealership are to reprogram the BSCM.
Bulletin No.: PIT5695B
Published date: 11/20/2019
Preliminary Information
PIT5695B Brake Pad Life % Calculates Down too Quickly and/or
Service Brake Pad Monitor System DTC C116B SYM59 and/or
C116C SYM59
Models
Brand:
Model
Years:
Model:
VIN:
from
to
Engine: Transmissions:
Silverado 1500
(New Model)
2019
SOP
Ft Wayne-1GCRYDED0KZ413442, SilaoAll
3GTP9EED9KG293960
All
Sierra 1500 (New
Model)
2019
SOP
Ft Wayne-1GCRYDED0KZ413442, SilaoAll
3GTP9EED9KG293960
All
Involved Region or Country North America
Condition
Some customers may notice a quick drop in the brake pad life % shown on the DIC,
which may not be re ective to the actual pad wear. In some cases, the customer
may comment of a Service Brake Pad message with DTC(s) C116B SYM59 and/or
C116C SYM59.
Cause
This concern could be cause by a software anomaly.
Correction:
Engineering has released new Brake System Control Module (BSCM) software to correct this concern. Reprogram
the BSCM with the latest software available in Tis2Web on July 20, 2019. In addition to reprogramming the BSCM
reset the brake pad life monitoring system using GDS2 as directed below.
- If the vehicle has less than 6,000 miles, then reset the brake pad life monitoring system to 100% using GDS2.
- If the vehicle has more than 6,000 miles, do not reset the brake pad life monitoring system.
Additional Information on the Brake Pad Life system and DTC's C116B SYM59 and C116C SYM59:
- The Brake System Control Module (BSCM) uses an algorithm to calculate the remaining brake pad life %. In
addition to the algorithm, there is one pad wear sensor at the left front brake pad and one at the left rear brake
pad. The wear sensor has three circuits, which successively open as they wear through at di erent pad
thicknesses. As the pad wears and it reaches the rst of the three circuits, it will open, and the BSCM will then
tailor the calculation to either speed up, slow down, or maintain the current pad life % calculated rate.
- The Brake Pad Monitor system can only be reset back to 100%. It can be reset through the DIC, but this feature
is only enabled in the DIC if the BSCM detects one of the brake pad wear sensors has worn through/opened and
then replaced. Because many of these vehicles have lower mileage, it is unlikely that a wear sensor has already
worn through and therefore, the only way to reset the brake pad life is by using GDS2.
- DTC's C116B SYM59 and/or C116C SYM59 can be set due to the software anomaly described in this PI. This is
because the BSCM is calculating the brake pad life % down too quickly without seeing the pad wear sensor circuit
wear open. If the BSCM does not see one of the wear sensor circuits open, before it calculates down the brake
pad life to a very low % (example 10-20%), it determines there is a mismatch and sets the DTC. Do NOT replace
the BSCM for these DTC's. To correct this issue, reprogram the BSCM with the latest calibrations in Tis2Web.
Then, if the vehicle has less than 6,000 miles reset the brake pad life back to 100% using GDS2 and no further
repairs are required. If the vehicle has more than 6,000 miles, inspect the brake pads and if there is 9 mm or
more of brake pad material left then reset the brake pad life to 100% using GDS2 and no further repairs are
required. In the rare case that there is less than 9 mm of brake pad material left, the brake pads will need to be
replaced, along with the pad wear sensor if worn. Then reset the brake pad life to 100% using GDS2 and no
further repairs are required.
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
2485998
Description
Time
Reprogram Brake System Control Module To Correct Brake
Pad Life Calculation
0.3 HR.
Version History
Version
3
Modi ed
06/28/2019 - Created on
08/07/2019 - Updated to add Correction information
11/20/2019 - Additional information added to the Title, condition and
correction
© 2019 General Motors
. All Rights Reserved.
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TSB/Document ID: PIT5695B
Replacement Service Bulletin Number:
MFR Communication Date: 2019-11-20
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES
MFR Component System:
MFR Component Subsystem:
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