Cadillac P1120: TP Sensor 1 Circuit Malfunction

Is your scanner showing Cadillac P1120?
No worries. We'll show you what it means and how to deal with it.

Presented by
Randy Worner

Cadillac P1120: TP Sensor 1 Circuit Malfunction

OVERVIEW
Severity
:
Medium
DIY Difficulty Level
:
Intermediate
Repair Cost
:
$200-$600
Can I Still Drive?
:
Yes (Short-term only)

What Does The Cadillac P1120 Code Mean?

Conditions for setting the DTC:

Engine started; system voltage over 10.0v and the PCM detected the TP Sensor 1 signal was less than 0.195v or more than 4.60v, or the difference between the TP1 and TP2 signals was more than 13% for 140 ms during the CCM test.

What Are The Potential Causes Of The Cadillac P1120 Code?

Below are some potential causes of this DTC:

  • TP1 sensor signal circuit is open, shorted to ground or to power
  • TP1 sensor low reference circuit has high resistance condition
  • TP1 sensor is damaged or has failed

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.

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