File in Section:
Bulletin No.:

Service Bulletin

Date:

06 - Engine
11-06-04-007C
November, 2012

TECHNICAL
Subject:

Diagnosis and Repair - Malfunction Indicator Lamp (MIL) Illuminated, Reduced Engine
Power Message Displayed, DTC P2135 Set

Models:

2008-2011 Cadillac Escalade Models
2009-2011 Cadillac Escalade Two-Mode Hybrid
2008-2009 Chevrolet TrailBlazer
2008-2011 Chevrolet Avalanche, Colorado, Express, Silverado, Suburban, Tahoe
2008-2011 Chevrolet Tahoe Two-Mode Hybrid
2009-2011 Chevrolet Silverado Two-Mode Hybrid
2008-2009 GMC Envoy
2008-2011 GMC Canyon, Savana, Sierra, Sierra Denali, Yukon Models
2008-2011 GMC Yukon Two-Mode Hybrid
2009-2011 GMC Sierra Two-Mode Hybrid
2008-2009 HUMMER H2
2008-2010 HUMMER H3
Equipped with Engine RPO LFA, LY2, L20, LMG, LC9, LH6, LMF, LH8, LH9, L76, LS2,
LY5, LY6, L92, L96, LZ1, L94 or L9H

Attention: If a vehicle is encountered with this condition, DO NOT replace the throttle body.
Instead follow this procedure below. ALL Model Year 2008-2011 vehicles MUST have
the engine control module (ECM) reprogrammed with the latest software calibration as
indicated in Step 35 of the procedure AFTER the installation of the throttle position
(TP) sensor cover. ALL 2011 Model Year vehicles will receive the enhanced oil life
monitor (OLM) algorithm as part of the new ECM calibration. The enhanced OLM
algorithm will provide a maximum mileage of 7,500 miles (12,000 km) between oil
changes.
This bulletin is being revised to add 2011 Model Year vehicles to the reprogramming
statement in the Attention and to identify that the 2011 ECM calibration includes the
enhanced oil life monitor (OLM) algorithm that has a maximum of 7,500 miles (12,000 km)
between oil changes. Please discard Corporate Bulletin Number 11-06-04-007B
(Section 06 – Engine/Propulsion System).

Condition

Cause

Some customers may comment on an illuminated
malfunction indicator lamp (MIL), with a Reduced
Engine Power message displayed.
The technician may observe on a scan tool
DTC P2135: Throttle Position (TP) Sensor 1-2
Correlation set as Current or in History.

This condition may be caused by the difference
between the TP Sensor 1 and TP Sensor 2 exceeding a
calibrated value for more than 2 seconds.

Copyright 2012 General Motors LLC. All Rights Reserved.

Page 2

November, 2012

Correction
Caution: Handle the electronic throttle control
components carefully. Use cleanliness in order to
prevent damage. Do not drop the electronic throttle
control components. Do not roughly handle the
electronic throttle control components. Do not
immerse the electronic throttle control components
in cleaning solvents of any type.
Warning: Approved safety glasses and gloves
should be worn when performing this procedure to
reduce the chance of personal injury.
1. With a scan tool, verify that DTC P2135 is set as
Current or in History.
⇒ If DTC P2135 is set as Current or in History,
proceed to Step 2.
⇒ If DTC P2135 is not set as Current or in History,
refer to Diagnostic Trouble Code (DTC)
List - Vehicle or Symptoms - Engine Controls
in SI.
2. Turn OFF the ignition.
3. Open the hood.
Important: If at any time during this procedure the
throttle body is dropped, abort this procedure and
REPLACE it with a new throttle body assembly.
4. Remove the throttle body and discard the throttle
body gasket. Refer to Throttle Body Assembly
Replacement in SI.
5. Remove any loose debris and dirt from the throttle
body assembly and the TP sensor cover. Inspect
the throttle body for damage.
Caution: Do not use any solvent that contains
Methyl Ethyl Ketone (MEK). This solvent may
damage fuel system components.
6. Clean the throttle body bore and the throttle plate
using a clean shop towel with GM Top Engine
Cleaner, P/N 1052626 (in Canada, P/N 993026), or
ACDelco Upper Engine and Fuel Injector Cleaner,
P/N 88861803, or an equivalent product.

Bulletin No.: 11-06-04-007C

Notice: DO NOT mount the throttle body in a vise. The
throttle body can be set on the top of a soft protected
workbench area.
7. Hold the throttle body with your hand, so that the
throttle position (TP) sensor cover is facing upward
as shown.

2697177

8. Secure a rubber band around the throttle body and
TP sensor cover as shown.

2697335

9. Turn over the throttle body and use a flathead
screwdriver to remove the two clips (1, 2) as
shown. Discard the clips.

2696698

Bulletin No.: 11-06-04-007C

November, 2012

Page 3

2697396

Notice: DO NOT PRY ON THE MACHINED SEALING
SURFACE OF THE THROTTLE BODY INLET DUCT.
10. Turn over the throttle body and use a flathead
screwdriver to remove the four remaining clips
from the TP sensor cover. Discard the clips.

2697650

Notice: DO NOT allow the intermediate gear to
fall out.
12. Maintain the throttle body in an upward position.
Use your thumb to maintain contact with the
intermediate gear.
⇒ If the intermediate gear falls out and impacts a
hard workbench surface or the floor, abort this
procedure and REPLACE with a new throttle
body assembly.

2697514

11. Hold the throttle body with your hand, so that the
TP sensor cover is facing upward. Grasp the TP
sensor cover and carefully lift it up and separate it
from the throttle body.

2697675

13. Verify that the TP sensor cover gasket HAS
REMAINED in the TP sensor cover as shown.
Ensure that the gasket is accounted for and
remains with the old TP sensor cover.

Page 4

November, 2012

2697721

Bulletin No.: 11-06-04-007C

2698978

16. Place the TP sensor cover in the position as
shown. Confirm the TP sensor drive slot orientation
is aligned in the TP sensor cover as shown.
⇒ If the TP sensor drive slot orientation is not
aligned as shown, use a small flathead
screwdriver to gently rotate the TP sensor drive
slot clockwise to the wide open throttle (WOT)
position as shown.

2698017

14. Observe the TP sensor cover for missing female
throttle actuator motor terminals (1). Verify that the
female throttle actuator motor terminals HAVE
REMAINED in the TP sensor cover and HAVE
NOT been retained on the throttle actuator motor
male terminals (2). Discard the old TP sensor
cover, gasket and terminals.
⇒ If one or both of the TP sensor cover female
throttle actuator motor terminals HAVE BEEN
retained on the throttle actuator motor male
terminals (2), remove and discard those female
terminals.
15. Remove the new TP sensor cover from the
protective shipping wrapper.

2697675

17. Verify that the TP sensor cover gasket is secure
and properly positioned.

Bulletin No.: 11-06-04-007C

November, 2012

2699003

Page 5

2699109

20. Rotate the throttle body plate to the WOT
position (1).

2699007

Notice: The three TP sensor cover alignment tabs are
highlighted in white for identification purposes only.
18. Verify that all three of the TP sensor cover
alignment tabs are present and are not damaged.
19. Grasp and hold the throttle body in the previously
hand held upward position. Lightly depress the
intermediate gear to verify that it is fully seated and
the gears are engaged.

2699101

21. Position and install the TP sensor cover to the
throttle body. Hold the TP sensor cover in position.
If necessary for ease of the clip installation, secure
a rubber band around the throttle body and TP
sensor cover.

Page 6

November, 2012

Bulletin No.: 11-06-04-007C

throttle position (WOT) and release pedal. Repeat
the procedure several times. The TP Sensor 1 and
2 Agree/Disagree parameter should display Agree.
⇒ If TP Sensor 1 and 2 Agree/Disagree parameter
displays Agree, proceed to Step 29.
⇒ If TP Sensor 1 and 2 Agree/Disagree parameter
displays Disagree, replace the throttle body
assembly.
29. Observe the ECM module DTC information. Are
DTC P1516, P2101 and/or P2176 set?
⇒ If DTC P1516, P2101 and/or P2176 are set,
replace the throttle body.
⇒ If DTC P1516, P2101 and/or P2176 are not set,
proceed to Step 30.
30. Tighten the throttle body fasteners.

Tighten
2700151

22. Install the first TP sensor cover clip (1) in the
position shown.

2699881

23. Install the remaining TP sensor cover clips in the
sequence shown.
24. Install a NEW throttle body gasket to the intake
manifold.
25. Install the throttle body, bolts and nuts. DO NOT
tighten the fasteners yet.
26. Connect the electrical connector to the
throttle body.
27. Turn ON the ignition. Clear the DTC with a
scan tool.
28. Observe the scan tool TP Sensor 1 and 2 Agree/
Disagree parameter while slowly depressing the
accelerator pedal to WOT and then slowly returning
the pedal to closed throttle. Repeat the procedure
several times. Rapidly depress the accelerator
pedal from the rest position to the wide open

Tighten the fasteners to 10 Y (89 lb in).
31. Install any remaining components that were
removed during this procedure.
32. Verify the battery voltage is more than 12 volts but
less than 16 volts before proceeding with ECM
reprogramming.
33. During reprogramming, the battery voltage must be
maintained within the proper range of 12-15 volts.
Connect the approved Midtronics® PSC 550
Battery Maintainer (SPS Programming Support
Tool EL-49642) to the vehicle.
⇒ If the above recommended tool is not available,
DO NOT connect a battery charger to the
vehicle. Connect a fully charged 12V jumper or
booster pack that is disconnected from the AC
voltage supply.
34. Use a Tech 2® or a multiple diagnostic interface
(MDI) module for reprogramming. Ensure that
either device is updated with the latest available
software version before performing the
reprogramming event.
Notice: Customers that own 2011 Model Year
vehicles should be advised of the enhanced OLM
algorithm that has a maximum of 7,500 miles
(12,000 km) between oil changes.
35. Reprogram the ECM using the Service
Programming System (SPS) with the latest
calibration available on TIS2WEB. Refer to the
SPS procedures in SI.
36. Perform the Throttle Learn Reset Procedure. Refer
to Throttle/Idle Learn > Throttle Learn > Reset
Procedure in SI.
MIDTRONICS is a registered trademark of
MIDTRONICS, INC.
Tech 2 is a registered trademark of General
Motors LLC
ACDELCO is a registered trademark of General
Motors LLC

Bulletin No.: 11-06-04-007C

November, 2012

Part Information

•

Important: The initial inventory for P/N 19259452
(Sensor Kit) will be distributed via RIM through a
special stocking policy. The dealership parts
department personnel will need to approve the stocking
policy in order to receive the initial shipment.
Subsequent replenishment will also be via RIM.
If the parts department is out of inventory of
P/N 19259452 (Sensor Kit), then to complete the repair
utilize the throttle body assembly.
Part Number

Description

Quantity

19259452

Throttle Position
(TP) Sensor
Cover

1

Warranty Information
•
•

For 2008-2009 vehicles repaired under the 5 year/
100,000 mile (160,000 km) Powertrain Coverage
(Code P) warranty, use:
For 2010-2011 Cadillac vehicles repaired under
the 4 year/50,000 mile (80,000 km)
Bumper-to-Bumper warranty (in Canada, Base
Warranty Coverage), use:

•

Page 7

For 2010-2011 Chevrolet, GMC or HUMMER
vehicles repaired under the 3 year/
36,000 mile (60,000 km) Bumper-to-Bumper
warranty (in Canada, Base Warranty
Coverage), use:
For 2010-2011 Chevrolet, GMC or HUMMER
vehicles repaired under the 3 year/
50,000 mile (80,000 km) California Emission
Coverage (Code E) warranty, use:

Labor Operation

Description

Labor Time

J7949*

Throttle Position
(TP) Sensor
Cover
Replacement

1.3 hrs**

J7949*
Express and
Savana Vans

Throttle Position
(TP) Sensor
Cover
Replacement

1.7 hrs**

*This is a unique labor operation for bulletin use only. It will
not be published in the Labor Time Guide.
**This time includes diagnosis, throttle body removal,
cleaning and installation, reprogramming the ECM, and
performing the Throttle Learn / Reset Procedure.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.

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