P1125 CADILLAC Possible Causes
- Faulty accelerator pedal position sensor
Accelerator pedal position sensor harness is open or shorted
Poor electrical connection in accelerator pedal position sensor circuit
How to Fix P1125 CADILLAC Code?
Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
When is the Code Detected?
The Powertrain Control Module (PCM) detects that the difference between accelerator pedal position sensor 1 (APP) and APP sensor 2 is greater than the expected value.
Possible Symptoms
Illuminated engine light (or service engine soon warning light)
P1125 CADILLAC Meaning
The accelerator pedal position sensor 1 (APP) and APP sensor 2 are potentiometer-type sensors, each with the following circuits:
• A 5-volt reference circuit
• A low reference circuit
• A signal circuit
The control module provides the APP sensors with a 5-volt reference circuit and a low reference circuit. The APP sensors then provide the control module with signal voltages proportional to pedal movement. The signal voltage from APP sensor 1 is low at rest and increases when the pedal is depressed.
The signal voltage from APP sensor 2 is low at rest and increases when the pedal is depressed. When the control module detects that the signal circuits of APP sensor 1 and APP sensor 2 do not correlate with each other, DTC P1125 is set.