15 Dtc - Chevy Cobalt SS Forum : Chevrolet Cobalt SS Forums
 
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post #1 of 4 (permalink) Old 06-19-2007, 01:33 PM Thread Starter
 
Join Date: Oct 2006
Posts: 7
15 Dtc

Hi: I have a 2006 cobalt ss/sc n o modifications the only mod a replacement dry flow filter inside the sotck air box, but the car has this mod since new.

First last mont the car for the first time give me the check engine light (engine power reduce).
Since that moment the car is always in the warranty i scanned the car and always gives me the same 15 codes and the dealer response is that they made some table testing.

some are
P2135
P2138
P0101
P0102
P0103
P0650
P0130
P0136
P0068


The first time they replace the mass air flow.

Second time the accelerator pedal.

Now they told me that theres no computer update (reprograming-TSB) or replacement for the car computer serial number. The car is doing the same thing now and the dealer has the car for 2 weeks and they dont know what to do with the car. Because this car is rare in here in Puerto Rico just 5 and 3 are demostration on dealers.

Any help is appreciated Thanks in advance.
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post #2 of 4 (permalink) Old 06-20-2007, 05:03 PM
 
Join Date: Aug 2006
Posts: 62
Quote:
P0068 Throttle Body Airflow Performance ECM
P2135 Throttle Position (TP) Sensor 1-2 Correlation ECM
P2138 Accelerator Pedal Position (APP) Sensor 1-2 Correlation ECM
If the MAF ans MAP sensors detect any amount of air outside the parameters, it thinks that the Throttle is not in the right position, so it goes into "limp mode" and re-calibrates the Throttle Position Sensor.
Quote:
P0101 Mass Air Flow (MAF) Sensor Performance ECM
P0102 Mass Air Flow (MAF) Sensor Circuit Low Frequency ECM
P0103 Mass Air Flow (MAF) Sensor Circuit High Frequency ECM
Bad MAF, check wiring to MAF, and clean with contact cleaner.
Sometiems ive seen where the MAF is not plugged in all the way.

Quote:
P0130 HO2S Circuit Sensor 1 ECM
P0136 HO2S Circuit Sensor 2 ECM
Bad O2 sensors. Check the wiring again, i had this problem when a Tech did not put the wiring for the rear O2 back in the loom harness.
Quote:
P0650 Malfunction Indicator Lamp (MIL) Control Circuit ECM
lol...your Check Engine Light wont turn off.



Sounds like you have some problems with your MAF, and your Throttle position sensor. All you can really do is to follow the wiring and make sure that its not broken anywhere ot grounding out. Check the plug going into the throttle body. Edit: Also check for any hoses that are disconnected from your intake tubing. If you eliminated the PCV hose, then you need to plug the hole in the intake tube. Also try putting the stock filter in there and see if that helps.

The O2 sensors need to be tested to make sure that they are working properly, and you may have a bad catylitic converter.

Or, your tune is WAAAAAAY off. Your Maf frequency values may be correlated wrong. Id let the dealer figure out whats going on.

Also, remember that you may want to try disconnecting your battery for a few hours to reset the ECU.

Last edited by socalsilverrl; 06-20-2007 at 05:15 PM.
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post #3 of 4 (permalink) Old 06-21-2007, 05:19 PM Thread Starter
 
Join Date: Oct 2006
Posts: 7
Thanks

Sounds like you have some problems with your MAF, and your Throttle position sensor. All you can really do is to follow the wiring and make sure that its not broken anywhere ot grounding out. Check the plug going into the throttle body. Edit: Also check for any hoses that are disconnected from your intake tubing. If you eliminated the PCV hose, then you need to plug the hole in the intake tube. Also try putting the stock filter in there and see if that helps.

THANKS, YOU ARE CORRECT THEY ME TOLD THAT A CABLE THAT GOES FROM THE FLOW METER P0068 WAS GROUDING OUT AND THAT CAUSES THE ECU TO BECOME SO ERRATICAL. THANKS
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post #4 of 4 (permalink) Old 06-21-2007, 05:34 PM
 
Join Date: Aug 2006
Posts: 62
^no problem. I hope they didnt fry your ECU...

The O2 sensors are the only other things id worry bout.

TB and MAF codes are very common on this car...especially the p1182 code from after market intakes.

p.s. welcome to the boards. If you ever need more info, there are more knowledgeable people on the Redlineforums (www.redlineforums.com)
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