Thread: P0122 and P1655 on 97 Grand Prix

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  1. #1 P0122 and P1655 on 97 Grand Prix 
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    Hey, I'm getting 2 codes on my Grand Prix, P0122 and P1655 (One is for a bad TPS, the other is for purge solenoid)

    But the real issue I'm having is that I just replaced my TPS and now the shifts are really bad, it takes a lot of effort just to get to second and third gear. I'm fairly certain there's no TPS adjusting (it's just a half turn and screw the 2 screws in) and I have done a relearn and am now disconnecting the battery overnight.

    I have replaced the TPS, the MAF, and the IAC valve as well and the issue is still there.

    Any ideas? Could I just have a bad TPS out of the box?
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  2. #2 Re: P0122 and P1655 on 97 Grand Prix 
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    Yes, or bad wiring.
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