Code Definition

P1122 — Throttle Position (TP) Sensor Circuit Intermittent Low Voltage

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

About P1122

P1122 is a manufacturer-specific powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1122 is stored, the module has detected a signal or supply voltage lower than the expected operating range; and 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.

P1122 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

This fault code is set when the Powertrain Control Module (PCM) detects an intermittent low voltage signal from the Throttle Position (TP) sensor. The TP sensor monitors the throttle position and provides critical data for fuel injection, ignition timing, and transmission shifting. A low voltage reading suggests the sensor is reporting a throttle angle lower than expected, which can cause issues such as poor throttle response, stalling, or hesitation.

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