My 2005 Malibu shows reduced engine power and the throttle doesn''t work. What can I do to fix this?
Chevrolet Malibu 3.5L V6Already Tried: Checked fuse
I have a technical bulletin for the reduced engine power problem on your vehicle.
You need to pull the codes and determine if the DTC P2138 is present. I don't have an exact fix, as we need to determine what codes are present first.
Here's the Technical Service Bulletin:
Bulletin No.: 07-06-04-019
Date: June 21, 2007
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 H22006-2008 HUMMER H32005-2008 Saab 9-7X
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.
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.
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)
I hope this information helps you determine what action to take.
Have a Great Day
37 Years Automotive Diagnosis and Repair. 25 Years of General Motors Dealer Experience
Reply to GM-Frank's Post: I pulled codes earlier today and there was one that said failure communicating with throttle... I don't remember the exact code but it ended with 07. This problem started when I pulled a fuse while the engine was running...when I replaced the fuse the engine revved and the problem started.
Thanks for your answer