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Thread: P0121? and P0748?

  1. 08-26-2007 02:59 AM #1
    cam_a_lot's Avatar
    cam_a_lot
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    P0121? and P0748?

    Thats my code...i think it was a tps but im not sure...would it just need replacing?
    Plus earlier i was getting a PC solenoid (p0748)...yeah...idk what that was all about. could someone maybe explain this to me please?
    '99 5.3L Silverado
    Interior: 3 10" Kicker comp CRV 600w (2 mounted in custom black suede covered console), 5" tv mounted in the rear of the console, DVD player in the glove box, Hifonics 1200w mono-block Brutus Amp, Blue under-seat lighting with blue lit dash switch, Paint-matched dash
    Exterior: AEM Brute force CAI, custom Flowmaster super 40 cat-back before tire dump, Shorty headers (Wrapped), LS1 Hotcam with a top-end rebuild @130K, Nelson tune, paint-matched SS bumper cover, Billet, paint-matched mirrors, painted stockies
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  2. 08-26-2007 04:30 AM #2
    HateUrFord
    HateUrFord is offline Junior Member
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    P0121 - Throttle Position Sensor/Switch A Circuit Range/Performance Problem
    P0748 - Pressure Control Solenoid Electrical

    Couldn't really explain it, but just thought i would put that there and see if it helps you any...
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  3. 08-26-2007 10:10 AM #3
    RedHeartbeat
    RedHeartbeat is offline WTH JUST HAPPENED?
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    Believer or not but I had a similar feedback once and it was the water temp sensor that was actually out.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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