Code Definition

P1220 — Throttle motor position sensor 2 circuit fault

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Isuzu

About P1220

P1220 is a manufacturer-specific powertrain diagnostic trouble code recorded for Isuzu vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1220 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1220 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The electronic throttle body contains two throttle position sensors that provide redundant feedback of throttle plate angle to the ECM. DTC P1220 sets when the ECM detects a fault in the throttle position sensor 2 circuit, where the second sensor signal is out of range, missing, or not agreeing with sensor 1. The two sensors typically move in opposite directions or with a fixed offset so the ECM can cross check them, and a fault in sensor 2 removes that redundancy. When this code sets the ECM often limits throttle authority or enters a reduced power mode, and the driver may notice reduced powe...

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