P2138 - How To? - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
Problems and Service Talk about any mechanical problems you are having

Closed Thread
 
LinkBack Thread Tools Display Modes
post #1 of 12 (permalink) Old 05-07-2014, 07:20 PM Thread Starter
Forum Regular
 
Join Date: Mar 2014
Posts: 66
P2138 - How To?

'06 Colbalt LT.

Driving today, check engine light, reduced engine power and T/C turns off. Made it home, scan for codes - P2138. Got this about a month ago as well (along with P2128 ). Digging around online, seems like the likely culprits are accelerator pedal position sensor, loose wire someplace, or there are two TSBs I think, a leak in Pillar A that may leak on a connection, and checking the PCM build dates as some were faulty.

Any other posibilities that need to be considered? I've learned the PCM code is not suspect (had that checked out last time the code came up) and code popped today when it was sunny and 60, hasn't rained in 3 days and has been driven 90 miles prior to getting the code. Thinking I should have the APP sensor taken care of?

Is this a difficult replacement? Anyone have a how to or could give me a walk through?

TIA.

2006 Cobalt LT

Last edited by Coby7; 06-19-2014 at 05:33 PM.
jcapartmentsale is offline  
Sponsored Links
Advertisement
 
post #2 of 12 (permalink) Old 05-07-2014, 08:21 PM
Super Moderator
YourCobalt.com Premium Member


 
Coby7's Avatar
 
Join Date: Oct 2011
Location: Magnetic Hill, New-Brunswick
Posts: 11,820
Garage
APP sensor is simple to change, one connector and 3 screws. It only fits one way.

Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

Never drive faster than your guardian angel can fly

Last edited by Coby7; 05-08-2014 at 10:03 AM.
Coby7 is offline  
post #3 of 12 (permalink) Old 05-08-2014, 07:13 AM Thread Starter
Forum Regular
 
Join Date: Mar 2014
Posts: 66
Probably a dumb question but is the sensor behind the gas pedal, or is it behind (in) the side panel? Directions seemed more complicated in the repair manual excerpt I found.

2006 Cobalt LT
jcapartmentsale is offline  
 
post #4 of 12 (permalink) Old 05-08-2014, 10:07 AM
Super Moderator
YourCobalt.com Premium Member


 
Coby7's Avatar
 
Join Date: Oct 2011
Location: Magnetic Hill, New-Brunswick
Posts: 11,820
Garage
Yeah, it's right on the pedal. I thought it only had 2 screws and a line-up pin but it has 3 screws that holds it in place.


Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

Never drive faster than your guardian angel can fly
Coby7 is offline  
post #5 of 12 (permalink) Old 05-24-2014, 01:48 PM Thread Starter
Forum Regular
 
Join Date: Mar 2014
Posts: 66
Coby7 - thanks again, after doing it myself, I saw it was much ado about nothing. As you said 3 bolts, tight squeeze but very simple. Hopefully this solves the issue.

2006 Cobalt LT

Last edited by Coby7; 05-24-2014 at 04:27 PM.
jcapartmentsale is offline  
post #6 of 12 (permalink) Old 05-24-2014, 04:27 PM
Super Moderator
YourCobalt.com Premium Member


 
Coby7's Avatar
 
Join Date: Oct 2011
Location: Magnetic Hill, New-Brunswick
Posts: 11,820
Garage
You should post a picture of the old one pulled so people on here know what it looks like. We love pictures you know...

Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

Never drive faster than your guardian angel can fly
Coby7 is offline  
post #7 of 12 (permalink) Old 05-24-2014, 07:32 PM Thread Starter
Forum Regular
 
Join Date: Mar 2014
Posts: 66
Not the greatest pics but this should give a good idea of what it looks like.

Whole part:


Electrical Connection:


Side view (can see where the 3 bolts would be):

2006 Cobalt LT
jcapartmentsale is offline  
post #8 of 12 (permalink) Old 06-19-2014, 05:14 PM Thread Starter
Forum Regular
 
Join Date: Mar 2014
Posts: 66
Soooo... as it turns out not the AAP sensor (or at least I still have the same problem/symptoms) . A little over 400 miles since I changed the pedal out. Leaving work. boom, check engine, reduced power. Pulled back around into the parking lot, turned the car off, pulled the same code - P2138. Waited 30 seconds and turned the car over. Engine power back and drove home no issues.

I'd seen what I think is a TSB for a leak in pillar A that indicates possible code of P2138 but the last two times the code has popped it's been a warm/hot sunny day with not much rain previously.

Any other ideas?

2006 Cobalt LT
jcapartmentsale is offline  
post #9 of 12 (permalink) Old 06-20-2014, 04:51 AM
Forum Regular
 
tred07's Avatar
 
Join Date: Oct 2012
Location: edmonton alberta canada
Posts: 172
i changed my throttle body after no luck switching out new gas peddle assembly.fixed my problem

2009 cobalt ss,k&N typhoon intake, short shifter,tuned cat-back exhaust, jet black.
tred07 is offline  
post #10 of 12 (permalink) Old 06-20-2014, 04:52 AM Thread Starter
Forum Regular
 
Join Date: Mar 2014
Posts: 66
tred07 - Same code?

2006 Cobalt LT
jcapartmentsale is offline  
Sponsored Links
Advertisement
 
Closed Thread




Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome