Thread: P0121 code trans not shifting right

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  1. #1 P0121 code trans not shifting right 
    GTPWINDYCITYBOI85
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    Default 10-16-2013
    this car is driving me crazy ok i been having the p1200 fuel injector circuit code and my cylinder 2 misfiring but now im getting the p0121 but the problems is now when my service engine light flashing my car shift perfect but for the last couple of the days the light been solid and my trans act as if it dont want to change out of 1st gear and my boost guage getting stuck on 4 bars but if you drive around like for 10 minutes the light start back flashing and the trans start back shifting perfect i bought another throttle position sensor that didnt fix the problem i hope someone can help me
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  2. #2 Re: P0121 code trans not shifting right 
    02NavyBlue
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    Default 10-16-2013
    You put a new TPS on it and still have the P0121? Or still having the trans issue but no more code?
    2006 Grand Prix GT S/C 109k - Modded Transgo Shift Kit, Gutted Airbox, Dash Cam, and Inlays. Retros soon to come.
    2002 Grand Prix GT N/A 127k - Same as 06 Plus: Trans Cooler, DIY Aux Input, LED lighting, Suspension Upgrades, Tint, Retrofits.     Sold.
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  3. #3 Re: P0121 code trans not shifting right 
    GTPWINDYCITYBOI85
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    Default 10-16-2013
    yea i put a new tps reset the code and it came right back but whenever my service engine light flash everything work perfect
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  4. #4 Re: P0121 code trans not shifting right 
    02NavyBlue
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    Default 10-16-2013
    Check the wiring going to the TPS and the connector. I'm not sure why the misfiring would temporarily "solve" the TPS issue. I got that correct, right? That's weird.
    2006 Grand Prix GT S/C 109k - Modded Transgo Shift Kit, Gutted Airbox, Dash Cam, and Inlays. Retros soon to come.
    2002 Grand Prix GT N/A 127k - Same as 06 Plus: Trans Cooler, DIY Aux Input, LED lighting, Suspension Upgrades, Tint, Retrofits.     Sold.
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  5. #5 Re: P0121 code trans not shifting right 
    GTPWINDYCITYBOI85
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    Default 10-16-2013
    yea its weird soon the light start flashing my car shift perfect
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  6. #6 Re: P0121 code trans not shifting right 
    02NavyBlue
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    Default 10-16-2013
    Well as you probably know, when it's flashing, it means misfires are happening at that moment. I'm not sure if for some reason there's an override for the tps or what. Since the TPS light comes back right after a new one, I'd look into to that issue just by checking wiring and connections.
    Last edited by 02NavyBlue; 10-16-2013 at 09:08 PM.
    2006 Grand Prix GT S/C 109k - Modded Transgo Shift Kit, Gutted Airbox, Dash Cam, and Inlays. Retros soon to come.
    2002 Grand Prix GT N/A 127k - Same as 06 Plus: Trans Cooler, DIY Aux Input, LED lighting, Suspension Upgrades, Tint, Retrofits.     Sold.
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  7. #7 Re: P0121 code trans not shifting right 
    BillBoost37
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    Default 10-17-2013
    Flashing is the pcm saying there is a potential catalyst damaging condition. While it's usually misfires, it can also be fueling etc.

    TPS effects shifting as the pcm uses it for many things.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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