P1120 PONTIAC Possible Causes
- Faulty throttle position sensor
- Throttle position sensor wiring harness is open or short-circuited
- Poor electrical connection in the throttle position sensor circuit
- Improperly adjusted throttle position sensor
How to Fix P1120 PONTIAC 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?
When the Powertrain Control Module (PCM) detects a signal voltage outside the normal operating range of the sensor, the P1120 code sets.
Possible Symptoms
Illuminated check engine light (or service engine soon warning light)
P1120 PONTIAC Meaning
The Throttle Position (TP) sensor is a potentiometer. The TP sensor provides a voltage signal that changes relative to the throttle blade angle. This signal voltage is one of the most important inputs used by the Powertrain Control Module (PCM). The TP sensor has a 5.0-volt reference, a ground, and a signal circuit.
The TP sensor signal voltage should be approximately 0.6 volts at idle. The TP sensor voltage should increase to over 4.0 volts at wide open throttle (WOT).