Cadillac P1221: TP Sensor 2 Signal Correlation

What Does The Cadillac P1221 Code Mean?

Key in crank or run position TP Sensor 1 (TP1) and TP Sensor 2 (TP2) more than 15% for 140 ms, and the PCM detected the TP2 signal disagreed with the TP1 signal by more than 7.5% for 1 second.

What Are The Potential Causes Of The Cadillac P1221 Code?

Below are some potential causes of this DTC:

• TP2 sensor connector is contaminated, dirty or contains water
• TP2 sensor signal, ground or VREF circuit has high resistance
• TP2 sensor VREF circuit has a high resistance condition
• TP2 sensor ground circuit has a high resistance condition

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> ACDelco Professional 213-4668 Throttle Position Sensor

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources

GM, 2013, Service Bullettin – Prior To Any Circuit Testing.