App Sensor/App Sensor 2 problems
 

I have a 2007 Monte Carlo. All of a sudden the "Service Traction System" light came on, followed immediatley by "Engine Power Reduced." Once it comes on, it stays on until the car is shut off for a while. It comes on about once a week. Is this something I can fix myself?

Auto Zone ran a scan and these were the details:

APP Sensor/APP Sensor 2
Signal voltage fault

exp: ECM has detected that the APP sensor signal 1 and 2 do not agree.

Prob.
1 - Poor electrical connection
2 - Fail App sensor

NOTE: I have no idea whether this could be relevant as it was a while back. In April the car was in an accident--it a curb causing $3000 worth of damage, tore the passanger wheel off and pulling practically everything it was connected to with it. The reason I toss this in is that in the event a sensor may have needed to be repaired in this type of repair, I may be able to prove that the repair part was faulty and insurance would cover it.

Thank for your help.

Welcome to the forum
I believe the APP is the Accelerator Pedal Position sensor...
Might check around the accelerator pedal for any loose connections or damage to the pedal/switch itself...
What was the code number? might check it out at OBD II codes to get more info

Code
 

I have a number written down as P2138. I am not sure if that is the code you refer to. I will try and find it.

give this TSB a read and see if it might apply..

2007 Chevrolet Monte Carlo | Impala, Monte Carlo (VIN W) Service Manual | Document ID: 1991306
#07-06-04-019: Intermittent MIL/SES, DTC P2138 with
Reduced Engine Power (Repair Instrument Panel (IP)
to Body Harness Connector) - (Jun 21, 2007)
Condition
Some customers may comment on an intermittent MIL/SES light Illuminated with a message
center or an indicator that displays Reduced Engine Power. DTC P2138 - Accelerator Pedal Position
(APP) Sensor 1-2 Correlation may be set. The voltage difference between APP sensor 1 and APP
sensor 2 exceeds a predetermined value for more than 2 seconds. Refer to DTC P2138 in SI for
further diagnostics.
Cause
On some vehicles, the IP to body harness connector, which carries the APP signal to the ECM/PCM,
is located in the left hand kick panel area and if the kick panel is not sealed properly, water enters
and causes a short in the APP circuits setting a P2138 code.
Correction
Important: Do Not replace the accelerator pedal assembly.
Locate the IP to body harness connector, which may be located in and around the left hand kick
panel area. Check to see if there is a water leak into the area and repair as necessary.
Warranty Information (excluding Saab U.S. Models)
For vehicles repaired under warranty, use:
Subject: Intermittent MIL/SES, DTC P2138 with Reduced Engine Power
(Repair Instrument Panel (IP) to Body Harness Connector)
Models: 2005-2008 GM Passenger Cars and Light Duty Trucks
(Including Saturn)
2005-2008 HUMMER H2
2006-2008 HUMMER H3
2005-2008 Saab 9-7X
Labor
Operation Description Labor Time
N6608
Wiring And/Or Connector-Emissions System -
Repair Or Replace
Use Published Labor
Operation Time
© 2010 General Motors Corporation. All rights reserved.
Document ID: 1991306 Page 1 of 2

Warranty Information (Saab U.S. Models)
For vehicles repaired under warranty, use:
Labor
Operation Description
Failed
Object
Fault/Reason
Code
Location
Code
Warranty
Type
Repair/Action
Code
Labor
Time
3713501
Wiring
And/Or
Connector-
Emissions
System -
Repair Or
Replace
37135 61 0 01
01 (Replace)
05 (Repair)
Use
Published
Labor
Operation
Time
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.
WE SUPPORT
VOLUNTARY
TECHNICIAN
CERTIFICATION
Document ID: 1991306 Page 2 of 2