Quick q? Turbo + p0121 - Cobalt SS Network



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Old 06-06-2008, 07:42 PM   #1
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Quick q? Turbo + p0121

I keep popping p0121 among others. This one however seems to elude me as to the cause.

It's a throttle body position sensor voltage deficiency code. It comes on pretty randomly. I don't see any effect from it.

The wiring harness has been spliced to make it longer but all of the connections seem good.

Any ideas?
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Old 06-07-2008, 10:59 AM   #2
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Anyone?
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Old 06-08-2008, 12:50 PM   #3
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53 veiws no one has a clue? I'm kind of lost with it myself.
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Old 06-08-2008, 12:52 PM   #4
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Gotta be in the wiring then. Connections were soldered, right?
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Old 06-08-2008, 01:17 PM   #5
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seeing as the code is a "deficiency" issue, I would assume that you have a poor connection in your wiring, TPS connector, or at the PCM. Best bet would be to measure resistance between PCM and TPS connector, there should be next to none with both PCM and TPS unplugged. Of course it could always be a faulty TPS sensor as well but i do not know resistance values nor do i think you have an oscilliscope to view the voltage pattern
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Old 06-08-2008, 01:21 PM   #6
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I remember getting this code. Try unplugging your PCM for just a minute or so and then replugging it back it. If that doesnt work, since you said you rewired part of it, I would try doing that section of wire over, maybe there is a problem with the wiring job.
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Old 06-08-2008, 01:24 PM   #7
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I got this code before I got my turbo setup retuned.

Basically the ECM thinks that the TB is not in the correct position for the airflow its reading entering the engine. Thats what I was told the reason was.
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Old 06-08-2008, 08:13 PM   #8
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Hmm. Maybe because the tb is now blow through. IDK is there a way to take car of this without deleting the code.
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Old 04-03-2011, 08:34 PM   #9
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i started getting this code as well after i installed my turbo kit and i cant get it figure out but it might be because my TB is not in the same place as it is if it was stock like the other guy said, but i dont know for sure if that it and i dont want to get a new TB to find out i still have the code coming up.
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Old 04-04-2011, 01:08 PM   #10
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use a multimeter and back probe the signal wire to the ecm. with the key on engine off throttle valve closed you should be at ~0.5volts. slowly push throttle and monitor the voltage on the meter. you should see the voltage increasing at the pedal is depressed. if your meter at any time looses voltage at a specific throttle angle then the sensor is bad. replace the sensor. if the voltage is lost at random throttle angles then your wiring needs repair. if your sensor is good and your wiring is good then you have an ecm problem.
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Old 04-04-2011, 05:16 PM   #11
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i forget which codes it is off hand but I believe thats one of the few you have to disable when converting to turbo.
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Old 04-06-2011, 12:29 PM   #12
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forgot to mention as well. this code can also be triggered for the pedal tps switch. check the throttle tps and also check the pedal tps.
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