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06 Pontiac Grand Prix Check Engine Light/ Reduced Engine Power Warning

3.8L V6 Engine was overheating last week, I replaced the thermostat and all was well until today. First I received a "Reduced Engine Power" warning and the check engine light came on. Shortly after that another warning was displayed - "Service Traction System". I could feel the reduced power, as if a cylinder or two wasn't working. I got 3 different error codes : P1125, P2125, and P2138. All three point to the Accelerator Pedal Position Sensor. So my question is, where is the APP sensor located?

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Posted on Jan 02, 2017

motor1258
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SOURCE: reduced engine power signal throwing out codes

There is a GM service bulletin on this particular item. basically covers both codes your getting.
#07-06-04-019A: 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)

Posted on Jul 03, 2009

  • 1 Answer

SOURCE: My 2004 Pontiac Grand Prix barely moves!!!!

Have you ever had the catalytic converter changed. Over time the pellets inside will melt together and this will make the care very very sluggish like it does not want to run. You may want to try that.

Posted on Jul 06, 2009

jdhnmi
  • 143 Answers

SOURCE: I have a 2004 grand

i had a problem with all my lights coming on in my 2006 explore took it to dealer to find out that the battery was dying replaced it and they went away

Posted on Mar 26, 2011

jturcotte
  • 8128 Answers

SOURCE: '91 pontiac grand prix, 3.1

Hi, the only thing common between the fuel pump circuit and the ignition circuit is the ECM itself. Recommend you check the ECM fuse. Not sure if it's in the car or the engine compartment fuse box. If this isn't the problem, you may have 2 separate problems. Your car doesn't have passlock anti-theft does it?

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Posted on Apr 03, 2011

jsmes1027
  • 749 Answers

SOURCE: 2005 Montana Sv6 3.5L on

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.
CauseThis 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.
  3. ? 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.
  4. 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.
  5. Note: Some examples of potential water leaks are: A-pillar seals, sunroof drain lines (if equipped) and windshield/cowl sealing.
  6. 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.
  7. ? If a water leak is observed, repair as necessary. Verify the effectiveness of the repair.
  8. Inspect the IP to body harness connector terminals for corrosion and debris. Refer to Testing for Intermittent Conditions and Poor Connections in SI.
  9. ? If any corrosion and/or debris is observed, repair as necessary.
  10. 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.
This is as service bulletin I located. Is there any additional codes present.Would definitely check that harness connection for corrosion and is vehicle running poorly?

Posted on Jun 23, 2011

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