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P0122 Code Low TPS Voltage

This is a discussion on P0122 Code Low TPS Voltage within the External Engine forums, part of the LSx Technical Help Section category; Hello All, I Have a 2000 WS6. I have been getting the check engine light and when I hook up ...

  1. #1
    Junior Member
    Join Date
    Apr 2015

    Navy Blue Metallic
    2000 WS6

    P0122 Code Low TPS Voltage

    Hello All,

    I Have a 2000 WS6.

    I have been getting the check engine light and when I hook up my code reader it is saying the code for low TPS voltage. I have replaced the sensor and it was fine for a little while and then tripped again.

    I have tested the wires and the power wire in is 5.0 volts as it should be. Ground wire 0 volts and blue wire 0 volts. when testing blue wire with a direct ground it is .6 volts and will move to a total of 3.9 volts when the throttle is wide open. When I test the blue wire with the factory ground I get the exact same results and the voltage increase is smooth without jumps. So it all appears to be working.

    Any ideas on why I am getting this code? or just change out the TPS again.

    I am posting this here and in the Firebird area so hopefully someone knows.

    Last edited by pajeff02; 10-30-2015 at 05:17 PM. Reason: Inserted correct DTC.

  2. #2
    Veteran 0rion's Avatar
    Join Date
    Aug 2005

    98 Formula
    06 duramax

    see if this will help you troubleshoot's not unheard of to get a bad sensor out of the box but I would want to make sure before wasting money throwing parts at it. Is it intermittent or does the code come back immediately after clearing? :: View topic - DTC P0122 Throttle Position (TP) Sensor Circuit Low Voltage
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  3. #3
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Mansfield, PA

    Black & Blue
    '02 WS.6 / '07 Suburban

    Are all your engine grounds secure and in good shape, ie. no corrosion?

    Looks like the PCM will set this code if it sees less than 0.2 volts for at least 10 seconds. The service manual notes that the 5V reference signal circuits are connected within the PCM and recommends that both the MAP sensor and EGR valve be checked for malfunction. If the DTC you are experiencing is intermittent (which it appears to be by your description), then you should also perform the diagnostic procedure for DTC P1122.

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