NHTSA ID Number: 10162108
Manufacturer Communication Number: PIT5202E
TSB/Document Date: 2019-07-08
Summary
This Preliminary Information communication provides information to the technician about vehicles that are equipped with 6L80 Regular Production Option Code (MYC), 6L90 Regular Production Option Code (MYD) or 8L90 Regular Production Option Code (M5U) Automatic Transmission, now have Powertrain Grade Braking. Powertrain grade braking assists when driving on a downhill grade to help maintain desired vehicle speed by using the engine and transmission to slow the vehicle.
Bulletin No.: PIT5202E
Published date: 06/4/2019
Preliminary Information
PIT5202E Normal Mode Powertrain Grade Braking Feature
Models
Brand:
Model:
Model
Years:
VIN:
from to
Engine:
Transmissions:
2013 - 2019
All
All All
6L80 RPO MYC, 6L90 RPO MYD or 8L90 RPO
M5U
Chevrolet
Avalanche
2013
All
All All
6L80 RPO MYC, 6L90 RPO MYD or 8L90 RPO
M5U
Chevrolet Express Van
2014 - 2019
All
All All
6L80 RPO MYC, 6L90 RPO MYD
Chevrolet Silverado
2013 - 2018
All
All All
6L80 RPO MYC, 6L90 RPO MYD or 8L90 RPO
M5U
Chevrolet Silverado LD
2019
All
All All
6L80 RPO MYC
2019
All
All All
6L90 RPO MYD
Chevrolet Suburban
2013 - 2019
All
All All
6L80 RPO MYC, 6L90 RPO MYD or 8L90 RPO
M5U
Chevrolet Tahoe
2013 - 2019
All
All All
6L80 RPO MYC, 6L90 RPO MYD or 8L90 RPO
M5U
Savana Van
2014 - 2019
All
All All
6L80 RPO MYC, 6L90 RPO MYD
Sierra
2013 - 2018
All
All All
6L80 RPO MYC, 6L90 RPO MYD or 8L90 RPO
M5U
Sierra Limited
2019
All
All All
6L80 RPO MYC
Sierra 2500/3500
2019
All
All All
6L90 RPO MYD
Yukon
2013 - 2019
All
All All
6L80 RPO MYC, 6L90 RPO MYD or 8L90 RPO
M5U
Escalade
Silverado
2500/3500
Supersession Statement
This PI was superseded to add 2019 model years. Please discard PIT5202D.
Starting with some 2013 models, Powertrain Grade Braking is now enabled while in Normal mode (Normal mode
= Tow/Haul mode OFF), along with a new DIC message "GRADE BRAKING ON" or "GRADE BRAKING ACTIVE" when
it goes active for the rst time. Powertrain grade braking has been available since 2009 on LD models and since
2007 on HD models, but Tow/Haul mode had to be selected. This feature (powertrain grade braking) should not
be confused with "Cruise Grade Braking".
For more information on Cruise Grade Braking see the owner's manual or the latest version of bulletin 08-07-30030.
PURPOSE
• Normal mode powertrain grade braking assists when driving on a downhill grade to help maintain desired
vehicle speed by using the engine and transmission to slow the vehicle.
• Helps reduce brake temperatures and wear on the traditional braking system.
ACTIVATION
• Normal mode powertrain grade braking defaults to "ON" after each ignition key cycle.
• To disable or enable all grade braking within the current ignition key cycle, press and hold the Tow/Haul button
for three seconds.
• No grade braking is available in Range Selection Mode (Manual Shift Mode).
• For grade braking to activate it requires the driver to apply steady brake pedal pressure to maintain desired
speed while driving on a downhill grade. The vehicle's modules monitor the amount of brake pedal apply, vehicle
deceleration rates, and other factors to determine if normal mode powertrain grade braking is necessary. When
the feature activates for the rst time that ignition cycle, the DIC will display "Grade Braking On" or "Grade
Braking Active" and you will notice the transmission down shifts and engine RPM increases. At this point, if the
brake pedal is released the transmission will hold the current gear. If additional engine/transmission braking is
needed to help maintain desired speed, reapply steady brake pedal pressure and additional down shifts may
occur.
• Normal mode powertrain grade braking will have a less aggressive transmission down shift schedule than
Tow/Haul mode powertrain grade braking.
• Grade-braking can be exited by depressing the accelerator pedal.
MESSAGES
• GRADE BRAKING DISABLED or OFF: This message displays when the grade braking has been disabled with the
tow/haul mode button on the end of the shift lever.
• GRADE BRAKING ENABLED or ON: This message displays when the grade braking has been enabled with the
tow/haul mode button on the end of the shift lever.
• GRADE BRAKING ON or ACTIVE: This message displays when the grade braking has been activated while driving
on downhill grades. This message will only appear the rst time the feature is activated in an ignition cycle. This
message will not display if Cruise Control Grade Braking goes active.
Note: On 2016 to 2019 model year Express and Savana Vans, there are NO DIC messages indicating grade braking
is Enabled, Disabled or Active. The grade braking feature is operational, but there are no DIC messages. Every
time the ignition is cycled on, the grade braking feature is enabled. After that point, if the Tow/Haul button is
pressed and held for three seconds, the feature will be disabled. If the Tow/Haul button is pressed and held
again, it is enabled and so on.
Remember, every time the ignition is cycled on, the grade braking feature will be enabled.
© 2019 General Motors. All Rights Reserved.
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TSB/Document ID: PIT5202E
Replacement Service Bulletin Number:
MFR Communication Date: 2019-06-04
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN
MFR Component System:
MFR Component Subsystem:
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