Cadillac P1271: Accelerator Pedal Position Sensor 1-2 Correlation

What Does The Cadillac P1271 Code Mean?

Engine started; system voltage over 10.0v, ETC serial data operating, the accelerator pedal is leaving idle position, the PCM detected the voltage difference between the APP 1 and APP 2 sensors was not correct when leaving the idle position.

What Are The Potential Causes Of The Cadillac P1271 Code?

Below are some potential causes of this DTC:

• APP sensor mounting bolts loose or damaged
• APP1, 2 sensor signal circuit open, shorted to ground or to B+
• APP1, 2 sensor VREF circuit is open or shorted to ground
• APP1, 2 sensor VREF circuit is shorted to system power (B+)

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
>>> Replacement APPS - Acceleration Pedal 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.