09 2.2 cobalt reduced engine - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 4 (permalink) Old 03-27-2019, 04:00 PM Thread Starter
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09 2.2 cobalt reduced engine

So I’ve had this ongoing problem for months now. Everytime I have to accelerate fast from a stop or in first gear as soon as my automatic transmission goes into second I get a reduced engine light and motor goes into limp mode. It was fine if I didn’t step on gas hard. Since then I’ve replaced the accelerator positioning sensor, the shoe throttle body, the pigtail going into throttle body still with no avail. It was throwing the p2135 code. Fast forward to today, I had to accelerate and shortly after it goes into reduced engine power and threw 11 different codes. P2135,p0442,p0128,p2176. Some were repeated More than once. I can not clear those 4. The only way to get it to temporary run right is to try to clear codes while running in reduced engine mode and even then it only works for a short time. Hope you guys can help a guy out. I need this car to get to work at the moment I got to get a ride till I get it fixed. Thanks guys
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post #2 of 4 (permalink) Old 03-27-2019, 07:22 PM
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what you mean shoe throttle body? you mean you change the whole unit?
p0442 is evap small leak. so double check your gas cap and remove your purge valve and see if you can blow through it, if you can its bad
p0128 is for the tstat - wouldnt be a bad idea to pop a new one in and maybe a new ect sensor while your at it
the 2176 is for min idle not learned and the 2135 is tp 1-2 correlation so if you replaced it with a new oe tb and your pigtail connections are sound your going to have to test the circuit from end to end and make sure the wiring is good
theres also a service bulletin about a possible wire chaff on the purge valve bracket - something worth a look

Last edited by TCSS07; 03-27-2019 at 07:34 PM.
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post #3 of 4 (permalink) Old 03-28-2019, 04:06 AM Thread Starter
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Sorry that was a typo. I meant to say whole throttle body.whats weird is all these codes with the exception of p2135 just came up. When I switched throttle body I did the relearn to no avail and that’s been a while ago. I’ll have to check into the possible chaff. Not sure really on how to test the wires. I’ll try to check into that as well.
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post #4 of 4 (permalink) Old 03-28-2019, 08:33 PM
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checking the wiring would involve a mutilmeter and checking the circuit for opens,short to power and ground - along those lines
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