070604019F

File in Section:
Bulletin No.:
Service Bulletin
Date:
06 - Engine
07-06-04-019F
November, 2017
TECHNICAL
Subject:
Intermittent Malfunction Indicator Lamp (MIL) Illuminated, DTC P2138 with Reduced
Engine Power (Repair Instrument Panel (IP) to Body Harness Connector)
Models:
2018 and Prior GM Passenger Cars and Light Duty Trucks
Attention: For 2014 Model Year ATS, refer to the latest version of Product Emission Bulletin 14176
before proceeding with this Bulletin. This Bulletin also applies to any of the above
models that may be Export vehicles.
This Bulletin has been revised to add the 2016-2018 Model Years. Please discard Corporate
Bulletin Number 07-06-04-019E.
Condition
•
•
Some customers may comment on an intermittent
malfunction indicator lamp (MIL) being Illuminated
with a message or an indicator that displays
Reduced Engine Power.
The technician may observe on a scan tool DTC
P2138 – Accelerator Pedal Position (APP) Sensor
1-2 Correlation set as Current or in History.
Cause
This condition may be caused by water intrusion into
the instrument panel (IP) to body harness connector,
which carries the APP sensor signals to the ECM/PCM.
This water intrusion results in a voltage difference
between APP Sensor 1 and APP Sensor 2 that
exceeds a predetermined value for more than a
calibrated period of time, setting P2138.
Correction
Note: Aftermarket equipment can generate DTC
P2138 and/or other DTCs.
1. Verify that aftermarket equipment is not electrically
connected to any of the APP sensor signal or low
reference circuits or to any other ECM/PCM 5V
reference or low reference circuits. Refer to
Checking Aftermarket Accessories in SI.
2. Perform the Diagnostic System Check - Vehicle.
⇒ If any 5V reference DTCs are set, refer to
Diagnostic Trouble Code (DTC) List - Vehicle.
⇒ If any 5V reference DTCs are not set, proceed
to Step 3.
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3. Locate the IP to body harness connector, which
may be located in and around the left hand kick
panel area or inside the IP. Depending on the
vehicle and model year, refer to Wiring Systems or
Power and Signal Distribution in SI.
Note: Some examples of potential water leaks are:
A-pillar seals, sunroof drain lines (if equipped) and
windshield/cowl sealing.
4. Inspect for a water leak in the area. If necessary
use a water hose to determine the source of the
leak. Refer to General Information > Water Leaks
in SI.
⇒ If a water leak is observed, repair as necessary.
Verify the effectiveness of the repair.
5. Inspect the IP to body harness connector terminals
for corrosion and debris. Refer to Testing for
Intermittent Conditions and Poor Connections
in SI.
⇒ If any corrosion and/or debris is observed,
repair as necessary.
6. After completing the repair, verify the proper
operation of the system. Depending on the vehicle
and model year, perform the Diagnostic Repair
Verification procedure or refer to Diagnostic
Trouble Code (DTC) List - Vehicle in SI.
Page 2
Warranty Information
For vehicles repaired under warranty, use the
appropriate labor operation for the source of the
water leak
November, 2017
Bulletin No.: 07-06-04-019F
Labor
Operation
Description
Labor
Time
0560032
Body Joint Resealing
0560052
Plenum Panel Resealing
0560072
Windshield Resealing
Use
Published
Labor
Operation
Time
Note: Time for removal of necessary components to gain
access to the leak and connector repair must be submitted
as Other Labor Hours and have appropriate authorization.
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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