NHTSA ID Number: 10178350
Manufacturer Communication Number: PIP4912G
TSB/Document Date: 2020-08-10
Summary
This Preliminary Information communication provides information to the technician on vehicles that may have an intermittent high idle. If a technician has duplicated, or the customer description aligns with the speeds mentioned in the idle speed description tables, the idle speed should be considered a normal characteristic of current vehicle design.
Bulletin No.: PIP4912G
Published date: 06/26/2020
Preliminary Information
PIP4912G Duramax Intermittent High Idle Or Elevated Idle
Descriptions
Models
Brand:
Model:
Model Years:
VIN:
from
Engine:
to
Transmissions:
Express
2010 - 2016
All
All
6.6L LGH
All
Silverado
2011 - 2020
All
All
6.6L L5P, LGH, LML
All
Savana
2010 - 2016
All
All
6.6L LGH
All
Sierra
2011 - 2020
All
All
6.6L L5P, LGH, LML
All
Supersession Statement
This PI was superseded to update Model Years. Please discard PIP4912F.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition / Concern
A dealer may encounter a customer concern of an intermittent high idle. High idles may be
commanded by the ECM for certain battery charging electrical loads or diesel particulate
filter (DPF) cleaning processes.
These idle up speeds may occur with no input from the customer. Idle speed descriptions are
included below.
G-VAN / GMT610 LGH IDLE SPEEDS
REASON
RPM
BASE IDLE
680
DPF Regen
AIC
Low battery
voltage
Enablement
Warm engine
Base engine curve -Varies with
680-850 coolant 680-850 temps from -40C
to 150C
Manual
1200
elevated idle
(default)
(UF3)
Cold temp
warm-up
(EPR)
Conditions/Constraints
680 -1300 RPM selectable via
Tech2
RPM level varies with coolant
temp disabled once coolant temp
680-1200
reaches 68C delayed for
extremely low coolant temps
During Regen and post-regen
800
cooldown, & HC clean-out
AlC idle speed request disabled
N/A
by platform for 2011
725
Assist battery charging
850
Further assist battery charging
Trans
Gear
P,N,D
P,N,D
Set parking brake,
cruise ON. cruise SET
P,N
Enabled by selection
through DIC
P, N
Level 1 Based on
Platform BCM module
request
Level 2 Based on
Platform BCM module
request
P,N
P,N
850
Further assist battery charging
Level 3 Based on
platform BCM module
request
P,N
C/K Truck / GMT900 / K2XX /T1XX L5P and LML IDLE SPEEDS
REASON
BASE IDLE
RPM
Conditions/Constraints
640
Warm engine
Base engine curve -Varies
with coolant temps from
-40C to 150C
640-850
Manual
elevated
idle (UF3)
1200 (default)
Cold temp
warm-up
(EPR)
640-1050
DPF Regen
800
AIC
N/A
Low battery
voltage
Trans
Gear
P,N,D
Enablement
P,N,D
Set parking
680 -1300 RPM selectable
brake, cruise ON,
via Tech2
cruise SET
RPM level varies with
coolant temp disabled once
Enabled by
coolant temp reaches 68C selection through
delayed for extremely low
DIC
coolant temps
During Regen and postregen cooldown, & HC
Auto
clean-out
AlC idle speed request
disabled by platform for
2011
750
Assist battery charging
900
Further assist battery
charging
1050
Further assist battery
charging
None
P,N
P,N
P,N,D
P,N
Level 1 Based on
Platform BCM
module request
Level 2 Based on
Platform BCM
module request
Level 3 Based on
Platform BCM
module request
P,N
P,N
P,N
C/K Truck / GMT900 / K2XX LGH IDLE SPEEDS
REASON
RPM
Conditions/Constraints
BASE IDLE
600
Warm engine
P,N,D
600-850
Base engine curve -Varies with
coolant temps from -40C to 150C
P,N,D
1200
(default)
680 -1300 RPM selectable via
Tech2
Manual
elevated idle
(UF3)
Cold temp
warm-up
(EPR)
DPF Regen
AlC
Low battery
voltage
Enablement
Set parking brake,
cruise ON, cruise
SET
RPM level varies with coolant temp
Enabled by
disabled once coolant temp
600-1050
selection through
reaches 68C delayed for extremely
DIC
low coolant temps
During Regen and post-regen cool800
Auto
down, & HC clean-out
AlC idle speed request disabled by
NlA
None
platform for 2011
Trans Gear
P,N
P,N
P,N,D
P,N
750
Assist battery charging
P,N
900
1050
Further assist battery charging
Further assist battery charging
P,N
P,N
Recommendations / Instructions
If a dealer has duplicated, or the customer description aligns with the speeds mentioned in
the idle speed description tables, the idle speed should be considered a normal
characteristic of current vehicle design.
Do not attempt repairs for intermittent high idle as described in this PI.
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.
© 2020 General Motors
. All Rights Reserved.
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TSB/Document ID: PIP4912G
Replacement Service Bulletin Number:
MFR Communication Date: 2020-06-26
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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