NHTSA ID Number: 10154272
Manufacturer Communication Number: PIP4766B
TSB/Document Date: 2019-03-11
Summary
This Preliminary Information communication advises New model Features. It covers updates in the programing from the 2008 to the new models of 2010-2011. The engine can auto stop in reverse. New aux pump connector design. Also coves Software changes to improve Shift feel.
Bulletin No.: PIP4766B
Published date: 02/5/2019
Preliminary Information
PIP4766B Hybrid
Changes In Hardware And Operating
Characteristics Of The Two Mode Hybrid System
Models
Brand:
Model:
Model Years:
VIN:
from
to
Transmissions:
Escalade
2010 - 2011
All
All
All
M99
Silverado
2010 - 2011
All
All
All
M99
Tahoe
2010 - 2011
All
All
All
M99
Sierra
2010 - 2011
All
All
All
M99
Yukon
2010 - 2011
All
All
All
M99
Supersession Statement
This PI was superseded to update RPO Codes. Please discard PIP4766A.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition / Concern
Information explaining 2010-2011 model year changes in operating characteristics and hardware of the TwoMode hybrid system. (Hybrid Option RPO HP2)
Recommendations / Instructions
1. Completely new software in the ECM, HPCM, MCM1, MCM2, and TCM. This software is not compatible with
previous model years. The driving feel has some minor improvements, but behaves largely the same for the
customer. Some noteworthy improvements are:
The engine will auto-stop while in reverse if the torque required to move the vehicle in reverse is too large, such
as backing up on an incline, The engine will start and remain on until the transmission is shifted out of reverse. If
the incline is steep, the engine may increase in speed in a step function causing a small bump. This is considered
normal operation.
If conditions allow the engine may now autostop during remote vehicle starts.
2. New connectors on the transmission auxiliary uid pump and auxiliary uid pump control module. The
connectors will be incompatible with model years prior to 2010.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is
resolved without completing every step, the remaining steps do not need to be performed.
© 2019 General Motors. All Rights Reserved.
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TSB/Document ID: PIP4766B
Replacement Service Bulletin Number:
MFR Communication Date: 2019-02-05
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
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