Engine code: P0121 TP sensor or APP sensor 1 problem

Discussion in 'GM Powertrain' started by mah2496, Nov 4, 2011.

  1. mah2496

    mah2496 Member

    My check engine light has been on since last night (2008 chevy silverado 1500, 5.3L, 120k miles). Mechanic's code reader displayed "P0121 TP sensor or APP sensor 1 problem". Truck seems to be running fine. Anyone encounter this engine code before or know if it's a serious problem?

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