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Joe, Pontiac Technician
Category: Pontiac
Satisfied Customers: 722
Experience:  23+ years in the automotive repair business
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Pontiac G6: I have a 2008 Pontiac G6 and my car gave me a

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I have a 2008 Pontiac G6 and my car gave me a eng pwr reduced and before it quit it gave me service traction across the radio what does this mean and what should i do to fix the probulem.

Hello and thank you for using just answer! I am here to help you with your problem, so feel free to ask questions until you are satisfied.

When this message comes on, it will set a trouble code in the vehicles ECM. Have you had the codes read with a scan tool?

Customer: replied 4 years ago.

no sir not yet

Without knowing which trouble there is, we cant be 100% positive about what is going on, but there is aTSB regarding a very common problem on these vehicles. It is most likely the problem:

Bulletin No.: 07-06-04-019A

November 06, 2008
MIL/SES, DTC P2138 with Reduced Engine Power (Repair Instrument Panel (IP) to
Body Harness Connector)

2005-2008 Gm
Cars and Light
Duty Trucks (Including Saturn)
2005-2008 HUMMER H2
2006-2008 HUMMER H3
2005-2008 Saab 9-7X


This Bulletin is being revised to add additional diagnostic service
information. Please discard Corporate Bulletin Number 07-06-04-019 (Section 06 -
Engine/Propulsion System)


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 a
brief period. Refer to DTC P2138 in SI for further diagnostics.


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 or inside the IP. Water intrusion into these
areas could cause an electrical short in the APP circuits setting a P2138

Make sure that no add-on/aftermarket equipment is electrically connected to the
APP signals or to the other ECM/PCM five volt reference
or return lines. These can generate false P2138 and/or other ETC System DTCs. If
there are other engine DTCs besides P2138, such as MAP sensor faults (i.e.
P0107, P0108), resolve these
first before attempting to diagnose P2138 DTCs.

Important: Refer to DTC P2138 in SI to confirm that the ETC pedal
is operating correctly.

Locate the IP to
body harness connector, which may be located in and around the left hand kick
panel area or inside the IP. Check to see if there is a water leak into the area
and repair as necessary. Use a water hose to determine the source of a water
leak and effectiveness of repair. Some examples of potential water leaks are:
A-pillar seals, sunroof drain lines (if so equipped) and windshield/cowl
sealing. Finally, repair or replace the IP to body harness connector, making
sure no corrosion or debris is left on or between the terminals

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