Conditions for Running the DTC: P0121

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

The ignition voltage is greater than 7 volts.
The TP sensor 1 voltage is between 0.18-4.6 volts.
DTC P0121 runs continuously once the above conditions are met.