Error Code P1220: Possible Causes
The error code P1220 can be triggered by several factors, including:
- A faulty throttle position (TP) sensor.
- A throttle position (TP) sensor wiring harness with a break or short circuit.
- A poor electrical connection in the throttle position (TP) sensor circuit.
How to Resolve Code P1220?
The first step is to carefully examine the potential causes mentioned above. Visually inspect the wiring and connectors associated with the TP sensor. Check for any damage to the components and ensure that no connector pins are broken, bent, pushed in, or corroded.
Associated Symptoms
The appearance of code P1220 may be accompanied by the following symptom:
- The engine light comes on (or a “check engine soon” warning light may activate).
Meaning of Code P1220
The throttle position (TP) sensor is mounted on the throttle body of the throttle actuator control (TAC) assembly. It actually incorporates two separate throttle position sensors in a single housing. To connect the TP sensor assembly to the TAC module, two separate signal circuits are used, along with a low reference circuit and a 5-volt reference circuit. The signal voltage emitted by the TP sensor increases proportionally to the throttle opening. The TP sensor signal circuit is powered by a 5-volt reference voltage.